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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
NAME:____________________________ CLASS: ________ DATE: ________
SCIENCE FOCUS 7 UNIT 2
PLANTS FOR FOOD AND FIBRE STUDY GUIDE
The study guides are vocabulary lists and questions that come directly from the textbook.
Almost all of the vocabulary words are found in the glossary and are usually completed before
starting the questions. Words that do not appear in the glossary can usually be found within the
text of the material. Most of the questions are “easily” answered by reading through the material
carefully and using the page numbers in brackets after each question. The questions appear in
order according to the information in the text.
Please monitor your child’s completion of this task and initial in the boxes below when it has
been completed. Students will need a parent signature in the box by the due date to receive the
full four marks for each topic. Notes completed after the due date will receive three marks for
each topic. The study guides are due on the day that the appropriate quiz is written but may be
completed in advance of the due date.
GRADE 7 UNIT 2: PLANTS FOR FOOD AND FIBRE
SUGGESTED COMPLETION DATE
PARENT SIGNATURE
TOPIC 1
TOPIC 2
TOPIC 3
TOPIC 4
TOPIC 5
TOPIC 6
It is important to review work on a regular basis. Notes can be read through and study guide
questions can be “asked” and “answered”.
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
SCIENCE FOCUS 7 UNIT 2
PLANTS FOR FOOD AND FIBRE STUDY GUIDE
TOPIC 1: PEOPLE AND PLANTS
CONCEPT
DEFINITION
ILLUSTRATION
fibre
Questions (the number in brackets at the end of the answer line is the page where the answer can be found)
1. People have always used __________________________________________________ (92)
2. Plants also provide fibre which _________________________________________________
__________________________________________________________________________ (92)
3. Fibre is ____________________________________________________________________
__________________________________________________________________________ (92)
4. In an ecosystem plants produce ________________and remove ___________________(92)
5. Plants are also the basis for _________________________________________________(92)
6. Plants provide ___________________________________________________________(92)
7. Plants help ______________________________________________________________(92)
8. The roots of plants help _______________________________________________________
__________________________________________________________________________ (92)
9. The 7 basic crops that supply ___________% of the world’s food supply are: ____________
__________________________________________________________________________ (92)
10. Many plants look ________________________________________________________ (93)
11. Plants provide ___________ for a variety of needs including : ________________________
_________________________________________________________________________________________ ( 94)
12. Three natural fibres we use are: _____________________________________________ (94)
13. Cotton is a _________________________________________________________________
__________________________________________________________________________(94)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
14. Cotton fibres are different from synthetic fibres in that cotton ________________________
__________________________________________________________________________(94)
15. Cotton fibres come from the plant’s _________________________________________(94)
16. Hemp is the ________________________________________________________________
and has a less _______________________________________________________________(95)
17. Flax is grown _______________________________________________________________
Flax fibres are taken ____________________________________________________________
and are ____________________________________________________________________(95)
18. Flax is grown on the Canadian prairies for _________________________________which is
__________________________________________________________________________(95)
19. Many medicines contain __________________________________________________ (98)
20. Plants often give us _______________________________________________________(98)
21. Aspirin comes from ___________Morphine from__________and quinine from _______ (98)
22. One of the most important plant products people use is ______________________________
It comes from___________________________________________________and since demand
_________________________________________________________________________(100)
23. Plants have also influenced _______________________________________________ (100)
24. Certain plants are the source of __________________________________which are used to
_________________________________________________________________________(100)
25. Plants are also used for __________________________________________________ (100)
26. In many places in the world, wood is still ____________________________________(101)
27. In other countries, plants _________________________________________________(101)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
28. Explain how coal is formed ____________________________________________________
______________________________________________________________________________
_________________________________________________________________________(101)
29. The sugar in some plants __________________________________________________(101)
30. Producing fuel from plants is __________________________________________________
because a large amount of energy is ________________________________________________
and a lot of energy is _______________________________________________________ (101)
31. To meet the growing need for plants we __________________________________________
_________________________________________________________________________ (101)
TOPIC 2: STRUCTURE AND ADAPTATIONS
CONCEPT
DEFINITION
ILLUSTRATION
taproot
root hairs
fibrous roots
diffusion
differentially
permeable
osmosis
chlorophyll
photosynthesis
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
respiration
transpiration
1. Each habitat has _____________________________________________________________
_________________________________________________________________________(104)
2. A plant’s structure helps__________________________________________________(104)
3. We need to understand ________________________________________________________
so that we can______________________________________________________________(104)
4. We can sometimes use ________________________________________________________
_________________________________________________________________________(104)
5. In many cases __________________________________________________________ (105)
6. Roots perform several functions: ________________________________________________
______________________________________________________________________________
_________________________________________________________________________ (105)
7. Many plants have ____________________________________________________________
These smaller roots are ______________________________________________________ (105)
8. The smaller roots and root hairs _________________________________________________
_________________________________________________________________________(105)
9. Most trees and large desert plants _______________________________________________
_________________________________________________________________________(105)
10. Other plants have _____________________________This is a ________________________
_________________________________________________________________________(105)
11. Roots are often _________________________________________________________(105)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
12. Root crops generally _______________________________________________________
and since they ___________________________________________________________ (106)
13. These qualities combined with _________________________________________________
make root crops ____________________________________________________________(106)
14. ______________________________________________are the two key processes that allow
_________________________________________________________________________(107)
15. Explain how the differentially permeable membrane of a cell works.____________________
______________________________________________________________________________
_________________________________________________________________________(107)
16. The three functions of stems are ________________________________________________
______________________________________________________________________________
______________________________________________________________________(108-109)
17. Use figure 2.18 from page 108 to fill in the table.
Heartwood
Xylem
Cambium
Phloem
Bark
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
18. Leaves are the part of the plant _________________________________________________
_________________________________________________________________________(110)
19. To do this, they _____________________________________________________________
_________________________________________________________________________(110)
INCLUDE FIG. 2.21 FROM P. 110 AND FIG. 2.23 FROM P. 111 IN YOUR LOGBOOK
20. Carbon dioxide enters ___________________________________________________(110)
21. Along with ___________________________plants produce_____________________(111)
22. Sugar is ___________________________________________________________________
Oxygen gas _______________________________________________________________(111)
23. Photosynthesis is the source ___________________________________________________
Oxygen produced by photosynthesis in _____________________________________________
_________________________________________________________________________(111)
24. Respiration is ______________________________________________________________
_________________________________________________________________________(111)
25. What are guard cells and what do they do? ________________________________________
______________________________________________________________________________
______________________________________________________________________________
_________________________________________________________________________ (111)
26. Explain how water is carried to the tops of trees. ___________________________________
______________________________________________________________________________
______________________________________________________________________________
_________________________________________________________________________ (111)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
TOPIC 3: PLANT REPRODUCTION AND BREEDING
CONCEPT
DEFINITION
ILLUSTRATION
selective
breeding
genes
sexual
reproduction
asexual or
vegetative
reproduction
ovules
pollination
embryo
fruit
germination
1. Early humans met their nutritional needs ________________________________________
_________________________________________________________________________(115)
2. Eventually people ____________________________________________________________
They even began ___________________________________________________________(115)
3. Explain what people did to develop the modern corn plant. _________________________
_________________________________________________________________________(115)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
4. Plants are also bred __________________________________________________________
_________________________________________________________________________(115)
5. Canadian __________________________________________________________________
are responsible for _________________________________________________________(117)
6. Canola was developed using ___________________________________________________
The new variety yielded______________________________________________________(117)
7. Work on canola continued and ________________________________________________
_________________________________________________________________________(117)
8. Plant scientists now have the ability to _________________________________________
_________________________________________________________________________(117)
9. Explain what is done with the plant’s genetic material ______________________________
_________________________________________________________________________(117)
10. The new plant will have _______________________________________________________
_________________________________________________________________________(117)
11. This process is usually called ___________________________________________________
but is sometimes called _____________________________________________________(117)
12. When a plant reproduces vegetatively ___________________________________________
_________________________________________________________________________(118)
13. Explain how layering works ___________________________________________________
_________________________________________________________________________(118)
14. Explain how grafting works ____________________________________________________
_________________________________________________________________________(118)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
15. Explain how cuttings work ____________________________________________________
_________________________________________________________________________(118)
16. In sexual reproduction – when plants reproduce ____________________________________
the resulting plants are all________________________________________________________
These differences help ______________________________________________________ (120)
17. Female cones contain ____________________Pollen grains containing ________________
develop on_______________________________________________________________(120)
18. Wind carries ___________________________________________________________ (120)
19. When a pollen grain gets blown between _________________________________________
it gets caught in ________________________________________________________________
A pollen tube then ______________________________________________________________
and sperm ____________________________________________________________________
As a result ________________________________________________________________ (120)
20. The process of ______________________________________________________________
__________________________________________is called ________________________(120)
21. Flowers with bright colored petals ______________________________________________
These animals _____________________________________________________________(121)
22. Flowers that aren’t brightly colored often _________________________________________
_________________________________________________________________________(121)
23. Flowers that open at night often ________________________________________________
_________________________________________________________________________(121)
24. Most flowers have _________________________________________________________
_________________________________________________________________________(122)
25. Petals are usually ____________________________________________________________
They ____________________________________________________________________(122)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
26. Sepals are usually ____________________________________________________________
They _____________________________________________________________________(122)
INCLUDE FIG. 2.33 FROM P. 122 IN YOUR LOGBOOK
27. Self pollination means ________________________________________________________
_________________________________________________________________________(124)
28. In cross-pollination __________________________________________________________
_________________________________________________________________________(124)
29. In the wild _________________________________________________________________
_________________________________________________________________________(124)
30. Explain how bees pollinate crops _______________________________________________
_________________________________________________________________________(124)
31. Artificial pollination can ______________________________________________________
_________________________________________________________________________(124)
32. Inside a seed is a tiny ____________________________called an________________ and a
________________________to keep it alive. They are protected by __________________(125)
33. Since cucumbers, green beans, tomatoes and pumpkins all have_______________________
________________________ They are all _______________________________________(125)
34. Seed dispersal is ____________________________________________________________
_________________________________________________________________________(127)
35. The two steps in harvesting field crops are ______________________________________
_____________________________________________________________________________
_________________________________________________________________________(128)
36. Once a seed is dispersed and reaches ___________________________________________
_________________________________________________________________________(128)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
TOPIC 4: MEETING THE NEED FOR FOOD AND FIBRE
CONCEPT
DEFINITION
ILLUSTRATION
sustainability
irrigate
monoculture
diversity
erosion
1. Canadians have used _________________________________________________________
to become ________________________________________________________________(132)
2. Millions of people are employed _______________________________________________
_________________________________________________________________________(132)
3. Since we grow more than _____________________________________________________
_________________________________________________________________________(132)
4. Scientists, farmers and foresters are ______________________________________________
_________________________________________________________________________(132)
5. We are concerned about __________________________________________________(132)
6. In general, European pioneers __________________________________________________
_________________________________________________________________________(132)
7. In the forests ________________________________________________________________
_________________________________________________________________________(132)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
8. In the late 1800s and early 1900s ________________________________________________
_________________________________________________________________________(133)
9. Early crops and prices were __________________, ________________________________,
and farmers were ___________________________________________________________(133)
10. Within a period of 30 years_____________________________________________________
_________________________________________________________________________(133)
11. Of the 60 million hectares _____________________________________________________
_________________________________________________________________________(133)
12. Every year, Alberta farmers _______________________________________________(134)
13. The food industry ____________________________________________________________
_________________________________________________________________________(134)
14. The food industry ____________________________________________________________
_________________________________________________________________________(134)
15. ____________________________________________________ are all grown for their seeds
and are___________________________________________________________________(134)
These crops are also_________________________________________________________(134)
16. Use the information on pages 134 and 135 to complete the table.
CROP
wheat
IMPORTANT INFORMATION
oats
canola
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
barley
legumes
potatoes
alfalfa
specialty
crops
17. The yield of field crops is very dependent on ____________________________________
such as___________________________________________________________________(137)
18. A wide range of warm-season crops _____________________________________________
_________________________________________________________________________(137)
19. The yield of field crops is very dependent on ____________________________________
such as___________________________________________________________________(137)
20. A wide range of warm-season crops _____________________________________________
_________________________________________________________________________(137)
21. To stay in business, farmers need _______________________________________________
They have to______________________________________________________________(140)
22. Using large farm machinery ___________________________________________________
Adding nutrients________________________________________________________________
Farmers also irrigate____________________________________________________________
Most farmers grow their crops as _____________________________________________(140)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
23. In Alberta, farming practices changed from _______________________________________
________________________________to almost total______________________________(140)
24. In the last 50 years ___________________________________________________________
Many farms now____________________________________________________________(140)
25. Use the information on pages 141 and to complete the table.
Activity
*farmers cultivate to
loosen soil for seeds
and to kill weeds
*others use chemicals
to kill weeds
*fertilizer is added to
provide nutrients
Technology of the early 1900s
Technology of today
*fungi is controlled to
protect seedlings
*seeds are spread
evenly to reduce
competition
*weeds and insects
are controlled
*grain is cut to allow
it to dry and ripen
*grain is threshed
(separated from other
plant material)
*grain is hauled for
storage or to market
*soil is turned and
mixed help kill pests,
to mix soil and plant
material and to aid
decomposition
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
26. Farmers must try ____________________________________________________________
_________________________________________________________________________(142)
27. Moisture is lost through ______________________________________________________
_________________________________________________________________________(142)
28. Eventually _________________________________________________________________
Field crops in the grasslands ______________________________________________________
and as a result______________________________________________________________(142)
29. Farmers who live close _______________________________________________________
are able to ________________________________________________________________(142)
30. Water from _________________________________________________________________
is channeled into____________________________________________________________(142)
31. These canals have been _______________________________________________________
_________________________________________________________________________(142)
32. Trees cover over ____________________________________________________________
an area larger than__________________________________________________________(143)
33. Canada has _________________________________________________________________
and produces_______________________________________________________________(143)
34. Alberta’s forestry industry _____________________________________________________
_________________________________________________________________________(143)
35. A forest is more than _________________________________________________________
Forests have many__________________________________________________________(143)
36. There are also many __________________________________________________________
_________________________________________________________________________(143)
37. The diversity ______________________________________________________________
_________________________________________________________________________(143)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
38. The presence of ____________________________________________________________
is often used as_____________________________________________________________(143)
39. Species in a ________________________________________________________________
When events disturb ________________________________________________________(143)
40. Fire was ___________________________________________________________________
_________________________________________________________________________(143)
41. This resulted in ______________________________________________________________
_________________________________________________________________________(143)
42. As the forests grew ___________________________________________________________
_________________________________________________________________________(143)
43. A cycle develops ____________________________________________________________
_________________________________________________________________________(143)
44. Forestry practices can ________________________________________________________
_________________________________________________________________________(143)
45. Use the information on pages 144 and 145 to complete the table.
TREE
SPECIES
lodgepole
pine
IMPORTANT INFORMATION
white
spruce
black
spruce
aspen
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
white
birch
tamarack
(larch)
INCLUDE THE CIRCLE GRAPHS ON PAGE 145 IN YOUR LOGBOOK
46. Foresters may choose to _______________________________________________________
or they may choose to________________________________________________________(146)
47. Some of the steps involved in harvesting trees include: (146)
48. Foresters are concerned about __________________________________________________
They analyze conditions such as_______________________________________________(147)
49. When trees are cut ___________________________________________________________
The leftover plant material ___________________________________________________(147)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
50. On most sites ______________________________________________________________
Seeds left behind ___________________________________________________________(147)
51. The opening up of the area _____________________________________________________
They then provide __________________________________________________________(147)
52. In Alberta forests, ____________________________________________________________
_________________________________________________________________________(147)
53. Pesticides are _______________________________________________________________
_________________________________________________________________________(147)
54. Soil erosion is one of _________________________________________________________
_________________________________________________________________________(147)
55. North Africa once had ________________________________________________________
Frequent and ______________________________________________________________(147)
56. In Brazil and West Africa, when ________________________________________________
soils became ______________________________________________________________(148)
57. In some areas of Europe and the U.S. ____________________________________________
_________________________________________________________________________(148)
58. In Pakistan, irrigation ________________________________________________________
However, excessive irrigation_________________________________________________(148)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
TOPIC 5: SUSTAINING THE SOIL
CONCEPT
DEFINITION
ILLUSTRATION
parent material
humus
horizons
topsoil
salinization
shelter belts
1. Healthy soil is critical ________________________________________________________
_________________________________________________________________________(149)
2. Soil gives plants _____________________________________________________________
_________________________________________________________________________(149)
3. Without soil ________________________________________________________________
_________________________________________________________________________(149)
4. Soil is an amazing ___________________________________________________________
that stores _________________________________________________________________(149)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
5. Use the information on page 150 to complete the table.
Major factors that determine how soil develops
6. Healthy soil contains _________________________________________________________
_________________________________________________________________________(151)
7. Decomposers break _____________________________________________________(151)
8. This helps ____________________________________________________________(151)
9. Use the information on page 151 to complete the table.
Key decomposers and how they work
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
10. Healthy growing plants require ________________________________________________
_________________________________________________________________________(155)
11. Different parts of plants _______________________________________________________
nitrogen helps _________________________________________________________________
seeds and stems need____________________________________________________________
flowers and seeds require_____________________________________________________(155)
12. ___________________________________________________________________________
are usually present in the ___________________________.
___________________________
________________________________often need to be added in_____________________(155)
13. Production practices __________________________________________________________
_________________________________________________________________________(156)
14. A white crust on the soil surface is ______________________________________________
_________________________________________________________________________(156)
15. High salt levels have _________________________________________________________
Every year that _________________________________________________________________
In some areas ______________________________________________________________(156)
16. Two factors lead to salinization: ________________________________________________
_________________________________________________________________________(156)
17. Excess ground water _________________________________________________________
_________________________________________________________________________(156)
18. The problem of soil salinization can be solved by _________________________________
_________________________________________________________________________(156)
19. Farmers also _______________________________________________________________
_________________________________________________________________________(156)
INCLUDE FIGURE 2.60 FROM PAGE 156 IN YOUR LOGBOOK
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
20. The problem of soil salinization can be solved by _________________________________
_________________________________________________________________________(156)
21. The most serious problem _____________________________________________________
This leads to_______________________________________________________________(157)
22. On average _________________________________________________________________
_________________________________________________________________________(157)
23. Soil is then less ____________________________________________________________
This makes ________________________________________________________________(157)
INCLUDE FIGURE 2.62 FROM PAGE 157 IN YOUR LOGBOOK
24. Soil erosion can be solved by ___________________________________________________
_________________________________________________________________________(158)
25. This gives the soil ___________________________________________________________
When more water soaks in____________________________________________________(158)
26. Vegetation also _________________________________________________________(158)
27. Instead of cultivating land _________________________________________________(158)
28. Seed drills push_____________________________________________________________
This technique, called _______________________________________________________(158)
29. Other benefits are____________________________________________________________
Disadvantages are __________________________________________________________(158)
30. Seed drills push__ ___________________________________________________________
This technique, called _______________________________________________________(158)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
31. Use the information on page 159 to complete the table.
Other methods of saving soil
shelter belts:
modified water ways:
crop rotation:
32. Hydroponics is __________________________________________________________(160)
33. Plants are usually grown_______________________________________________________
Gravel or “rock wool” and ___________________________________________________(160)
34. In warmer parts of the world____________________________________________________
In Canada, ________________________________________________________________(160)
35. Forestry can ___________________________________________________. When trees are
_________________________________________________________________________(162)
36. To minimize damage_________________________________________________________
As the debris decays ________________________________________________________(162)
37. Forests are also______________________________________________________________
As well ___________________________________________________________________(162)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
TOPIC 6: PESTS AND PEST CONTROL
CONCEPT
DEFINITION
ILLUSTRATION
bioaccumulation
residues
resistant
organic
biological
control
1. Every year _________________________________________________________________
_________________________________________________________________________(163)
2. From a farmer’s point of view, a pest is __________________________________________
_________________________________________________________________________(163)
3. Insects are not the only types of pests. __________________________________________
__________________________________________can also be pests in certain situations. (163)
4. In natural systems, ___________________________________________________________
_________________________________________________________________________(164)
5. The pests that cause most damage are: ___________________________________________
_________________________________________________________________________(164)
6. Weeds are “thieves”, they _____________________________________________________
_________________________________________________________________________(164)
7. Insects usually _________________________________________________________(164)
8. Fungi and bacteria can ____________________________________________________(164)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
9. Insects and diseases consume __________________________________________________
Farmers spend ____________________________________________________________(164)
10. Use the information from the chart about the Dandelion to complete the table showing why
dandelions are such successful weed pests (165)
Powerful roots:
Broad leaves:
Super seeds:
Adaptable:
Chemical weapons:
11. Use the information from the chart about Canola to complete the table showing why each
pest is successful (166)
Canada Thistle
Wild oats
Blackleg fungus
Sclerotina
Fusarium fungus
Bertha army worm
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
Lygus bugs
12. Each food and fibre species has ________________________________________________
_________________________________________________________________________(167)
13. Many of the worst ___________________________________________________________
_________________________________________________________________________(167)
14. Introduced species become serious pests because ___________________________________
_________________________________________________________________________(167)
15. Some foreign weed species came _______________________________________________
But others ________________________________________________________________(167)
16. Since people have been growing crops ___________________________________________
Large pests _____________________________Small pests _____________________________
Over the past 200 years, __________________________________________________________
_________________________________________________________________________ (168)
17. Explain how the process of crop rotation works (168)
18. Chemical controls seemed to be ____________________________________________(168)
19. Herbicides, insecticides, and fungicides controlled __________________________________
These chemicals were _______________________________________________________(168)
20. It took several decades of use before ________________________________________(168)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
21. Pollutants such as ___________________________________________________________
can ______________________________________________________________________(170)
22. Bioaccumulation is one of the ______________________________________________(170)
23. Some of the chemicals ____________________________________________________(170)
24. If the pesticides are __________________________________________________________
_________________________________________________________________________(170)
25. Toxic residues have been found ________________________________________________
_________________________________________________________________________(170)
26. Pesticides are often ______________________________________________________(170)
27. In most cases, ______________________________________________________________
_________________________________________________________________________(170)
28. Killing non-target species often ____________________________________________(170)
29. Scientists have discovered that ________________________________________________
_________________________________________________________________________(171)
30. Target insects that survive have become _____________________________________(171)
31. Each generation of insects then ________________________________________________
_________________________________________________________________________(171)
32. To control these tough insects you need to use _____________________________________
_________________________________________________________________________(171)
33. These higher dosages ________________________________________________________
_________________________________________________________________________(171)
34. Organic food is food that _____________________________________________________
_________________________________________________________________________(172)
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Science Focus 7 – Unit 2 Plants for Food and Fibre Study Guide
35. Organic food growers use _____________________________________________________
They fight weeds and pests by ____________________________________________________
______________________________________________________________________________
_________________________________________________________________________ (172)
36. Other practices used to reduce the need for chemicals include:
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
_________________________________________________________________________(172)
37. Many organic farmers also ____________________________________________________
Increasing diversity_________________________________________________________(172)
38. Producing without chemicals requires ___________________________________________
Benefits include________________________________________________________________
Consumers enjoy___________________________________________________________(172)
39. Biological control means _____________________________________________________
_________________________________________________________________________(172)
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