Download Section 24–1 Reproduction With Cones and Flowers

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Chapter 24 Reproduction of Seed Plants
Section 24–1 Reproduction With Cones and Flowers
(pages 609–616)
TEKS FOCUS: 13B Methods of reproduction; TEKS SUPPORT: 3C Impact of research on scientific
thought and society; 5B Cell differentiation; 7B Results of natural selection in adaptation
This section describes the reproductive structures of gymnosperms and
angiosperms. It also explains how pollination and fertilization differ between
angiosperms and gymnosperms.
Alternation of Generations
(page 609)
1. Circle the letter of each sentence that is true about alternation of generations in plants.
a. In all plants, the sporophyte generation is diploid.
b. The gametophyte in seed plants is hidden within the sporophyte plant.
c. The recognizable part of a seed-bearing plant is the gametophyte.
d. In all plants, the gametophyte generation is haploid.
2. An important trend in plant evolution is the reduction in the size
of the
gametophyte
.
3. Where are the gametophytes found in gymnosperms and angiosperms?
They are found inside the cones in gymnosperms and inside flowers in angiosperms.
Life Cycle of Gymnosperms
(pages 610–611)
4. Reproduction in gymnosperms takes place in
cones
.
5. Circle the letter of what produces cones in gymnosperms.
a. mature sporophyte
c. pine trees
b. mature gametophyte
d. pollen seeds
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6. What kind of cone produces male gametophytes? Pollen cones
7. The male gametophytes of gymnosperms are called
pollen grains
.
8. Circle the letter of each sentence that is true about seed cones.
a. They produce pollen grains.
b. They produce female gametophytes.
c. They have two ovules at the base of each scale.
d. They are generally much larger than pollen cones.
9. Is the following sentence true or false? Each mature female gametophyte contains
false
hundreds of egg cells ready for fertilization.
10. How long does the gymnosperm life cycle typically take to complete?
It typically takes two years.
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11. In the gymnosperm life cycle, how do the pollen grains reach the female cones?
The pollen grains are released by the male cones, and some are carried to the female cones by the
wind.
12. What ensures that pollen grains stay on the scales of a female cone? A sticky material,
called pollination drop, ensures that the pollen grains stay.
13. A structure grown by a pollen grain that contains two sperm nuclei is called
a(an)
pollen tube
.
14. What happens to the two sperm cells once the pollen tube reaches the female
gametophyte? One sperm nucleus disintegrates, and the other fertilizes the egg
contained in the female gametophyte.
15. Circle the letter of what a gymnosperm embryo can be called.
a. mature gametophyte
b. new sporophyte
c. mature sporophyte
d. new gametophyte
16. What are the three generations of the gymnosperm life cycle that are contained in a
gymnosperm seed? The outer seed coat is part of the old sporophyte generation, the haploid
cells surrounding the embryo are part of the female gametophyte, and the embryo is the new
sporophyte plant.
Structure of Flowers
(pages 612–613)
a. Sepals
b. Petals
c. Stamens
d. Carpels
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17. What are the four kinds of specialized leaves that compose a flower?
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Match the floral part with its description.
Description
Floral Part
d
18. Sepals
a. Stalk with the stigma at the top
i
19. Petals
b. Structures where male gametophytes are produced
h
20. Stamen
c. Flower part that contains one or more ovules
e
21. Filament
d. Outermost, green floral parts
b
22. Anthers
e. Long, thin structure that supports an anther
f
23. Carpels
f. Innermost floral parts that produce female gametophytes
c
24. Ovary
g. Sticky, top portion of style
a
25. Style
h. Male structure made up of an anther and a filament
g
26. Stigma
i. Brightly colored parts just inside the sepals
27. Label the parts of the flower on the illustration.
Stigma
Style
Anther
Stamen
Filament
Petal
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Style
Ovules
Ovary
28. What is a pistil? It is a reproductive structure formed from the fusion of several carpels.
29. What are the separate male and female flowers on a corn plant? The tassel is a flower
that produces male gametophytes, and the silk is the style of a flower that contains the female
gametophyte.
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Life Cycle of Angiosperms
Class __________________
Date ______________
(pages 614–615)
30. Where does reproduction in angiosperms take place? It takes place within the flower.
31. Inside the anthers, each cell undergoes meiosis and produces haploid cells called
megaspores
.
32. In angiosperms, the pollen grain is the entire
male gametophyte
.
33. The female gametophyte of an angiosperm, contained within the ovary, is called
embryo sac
the
.
34. Circle the letter of each sentence that is true about the life cycle of angiosperms.
a. The cycle begins when the mature sporophyte produces flowers.
b. A pollen grain stops growing when it is released from the stigma.
c. The female gametophyte develops in the ovule.
d. The egg nucleus is one of the eight nuclei in the embryo sac.
Pollination
(page 615)
35. How are most gymnosperms pollinated? Most are pollinated by the wind.
36. How are most angiosperms pollinated? Most are pollinated by animals.
37. What are three kinds of animals that pollinate angiosperms? Insects, birds, and
mammals pollinate angiosperms.
Fertilization in Angiosperms
(page 616)
38. What are the two distinct fertilizations that take place in angiosperms?
a. One of the sperm nuclei fuses with the egg nucleus to produce a diploid zygote cell.
b. The other sperm nucleus fuses with two other nuclei in the embryo sac to form a triploid cell.
endosperm
.
40. Why is fertilization in angiosperms known as double fertilization?
Two distinct
fertilization events take place between the male and female gametophytes.
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39. The food-rich tissue that nourishes a seedling as it grows is known as
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41. Complete the flowchart about the life cycle of angiosperms.
meiosis
Inside the anthers, each cell undergoes
Each megaspore becomes a(an)
to produce megaspores.
pollen grain
.
nuclei
The nucleus of each pollen grain produces two haploid
The pollen grain lands on a stigma and begins to grow a(an)
that eventually reaches the ovary and enters the
ovule
One of the sperm nuclei fuses with the egg nucleus to produce a(an)
.
pollen tube
.
zygote
the other sperm nuclei fuses with two other nuclei to form a cell that grows into the
, and
endosperm
.
Reading Skill Practice
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Outlining is a way you can help yourself understand better and remember what you
have read. Write an outline for Section 24–1, Reproduction With Cones and Flowers. In
your outline, use the blue headings for the first level and the green subheadings for
the second level. Then, list the details that support, or back up, the main ideas.
Students should use the section’s six blue headings for the first level of their outline and use the green
headings where appropriate. Supporting details should include the boldface vocabulary terms and key
concepts.
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Section 24–2 Seed Development and Germination
(pages 618–621)
TEKS FOCUS: 13A Significance of structural adaptations of plants to their environments;
13B Methods of development of plants; TEKS SUPPORT: 7B Natural selection in adaptation
This section explains how seeds develop and are dispersed. It also describes
factors that influence the dormancy and germination of seeds.
Seed and Fruit Development
(page 618)
1. What is a fruit? It is a ripened ovary that contains angiosperm seeds.
2. What happens as angiosperm seeds mature after fertilization is complete?
The ovary walls thicken to form a fruit that encloses the developing seeds.
3. The outer layer of the seed that protects the embryo and its food supply is called a(an)
seed coat
.
4. Is the following sentence true or false? Both cucumbers and tomatoes are fruits.
true
5. Circle the letter of each sentence that is true about fruits.
a. As seeds mature, the ovary walls thicken to form a fruit.
b. Fruits can carry one seed or several seeds.
c. A fruit is a ripened ovary that encloses a seed or seeds.
d. The inner wall of the ovary never touches the seed.
Seed Dispersal
(page 619)
6. Why are seeds that are dispersed by animals typically contained in fleshy, nutritious
fruits?
These fruits provide nutrition for the animal and also help the plant disperse its seeds.
7. Circle the letter of why seeds dispersed by animals are covered with tough coatings.
a. The seeds need to be able to float on water.
c. The seeds need to be digested by the animal that eats them.
d. The coatings prevent the seeds from being eaten by animals.
8. Why are seeds dispersed by wind or water typically lightweight?
Being lightweight allows the seeds to be carried in the air or to float on the surface of the water.
9. How are the seeds of ash and maple trees dispersed long distances from the parent
plants? Their seeds are encased in winglike structures that spin and twirl as they are released,
helping them glide considerable distances.
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b. The coatings enable the seeds to pass through an animal unharmed.
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10. What adaptation does a coconut seed have that helps its dispersal? The seed contains a
liquid endosperm layer that makes a coconut buoyant enough to float in sea water within its
protective coating for many weeks.
Seed Dormancy
(page 620)
11. What is dormancy? It is a period in which the plant embryo is alive but not growing.
12. What are two environmental factors that can cause a seed to end dormancy and
germinate?
a. Temperature
b. Moisture
13. What are two purposes served by seed dormancy?
a. It can allow for long-distance dispersal.
b. It can allow seeds to germinate under ideal growth conditions.
14. Is the following sentence true or false? Some pine tree seeds remain dormant until the
high temperatures generated by a forest fire cause cones to open and release the seeds.
true
Seed Germination
(page 621)
15. What is seed germination? Seed germination is the early growth stage of the plant embryo.
16. Complete the flowchart about seed germination.
When a seed germinates, it absorbs
water
.
seed coat
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The water causes the endosperm to swell, which cracks open the
Through the cracked seed coat, the young
root
.
begins to grow.
17. Circle the letter of each sentence that is true about seed germination.
a. In some dicots, the cotyledons protect the first foliage leaves.
b. In most monocots, the cotyledon remains within the seed.
c. In some dicots, the cotyledons remain below the soil and provide food for the
seedling.
d. In most monocots, the cotyledon emerges above ground to protect the leaves.
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Section 24–3 Plant Propagation and Agriculture
(pages 622–626)
TEKS FOCUS: 1B Make wise choices in the use of resources and the disposal or recycling of materials;
TEKS SUPPORT: 6E Compare mitosis and meiosis with regard to asexual and sexual reproduction
This section describes how asexual reproduction occurs in plants. It also
describes plant propagation and identifies which crops provide the major food
supply for humans.
Vegetative Reproduction
1.
The method of asexual reproduction used by many flowering plants is
vegetative reproduction
called
2.
(pages 622–623)
.
What does vegetative reproduction enable a single plant that is well adapted to the
environment to do? It enables the plant to produce many offspring genetically identical to
itself.
3.
Vegetative reproduction includes the production of new plants from what three
kinds of plant structures?
a. Horizontal stems
b. Plantlets
c. Underground roots
4.
Why does vegetative reproduction enable plants to reproduce very quickly?
It does not involve pollination or seed formation.
5.
What do spider plants produce that allows them to reproduce vegetatively?
They produce plantlets.
6.
Is the following sentence true or false? New plants can grow from the leaves of a
true
7.
How do strawberry plants reproduce vegetatively? They send out long trailing stems called
stolons that produce roots when they touch the ground. Once the roots are well established, each
stolon may be broken, forming a new, independent plant.
8.
How do bamboo plants reproduce asexually? They grow long underground stems that can
send up new shoots in several places.
Plant Propagation
9.
(page 623)
What do horticulturists use plant propagation for? They use it to make many identical
copies of plants or to produce offspring from seedless plants.
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parent plant if the leaves fall to the ground and the conditions are right.
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10. Why might a horticulturist not want a plant to reproduce sexually by seeds?
The growers want to avoid the variation that would result if the plant reproduced sexually.
11. Circle the letter of what a cutting must have to form roots when placed in a rooting
mixture.
a. Several stolons
c. Buds containing meristematic tissue
b. A taproot
d. Buds without meristematic tissue
12. When a piece of stem or a lateral bud is cut from a parent plant and attached to
another plant, what are the cut piece and the plant to which it is attached called?
The cut piece is called a scion, and the plant to which it is attached is called the stock.
grafting
13. When stems are used as scions, the process is called
14. What is the process called when buds are used as scions?
.
Budding
15. In what kind of cases do growers use grafting and budding? Grafting and budding are
used to reproduce seedless plants and varieties of woody plants that do not produce strong root
systems.
Agriculture
(pages 624–626)
16. Circle the letter of when evidence suggests that agriculture developed in many parts of
the world.
a. about 1–2 million years ago
c. about 10,000–12,000 years ago
b. about 1000–2000 years ago
d. about 100,000 years ago
17. What are three crop plants that most people of the world depend on for
the bulk of their food supply?
a. Wheat
b. Rice
c. Corn
18. The food taken from crops such as wheat, rice, and corn is stored in their
seeds
.
19. What are the four crops that 80 percent of all U.S. cropland is used to grow?
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They include wheat, corn, soybeans, and hay.
20. What important crops were unknown in Europe before they were introduced there
from the Americas? Important crops include corn, peanuts, beans, and potatoes.
21. What are two ways in which the efficiency of agriculture has been improved?
a. One way is the selective breeding of crop plants.
b. A second way is improvements in farming techniques.
22. How has the use of pesticides and fertilizers affected crop yields? They have been
responsible for dramatic improvements in crop yields.
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WordWise
Answer the questions by writing the correct vocabulary terms in the blanks.
Use the circled letter in each word to find the hidden word. Then, write a
definition for the hidden word.
What is the process in which stems are used as scions?
g
r
a
f
t
i
n
g
What are the flower parts that are brightly colored and are found just inside the sepals?
p
e
t
a
l
s
What are the floral parts called that produce the female gametophytes?
c
a
r
p
e
l
s
What does an anther and a filament together make up?
s
t
a
m
e
n
What is the sticky portion of the style where pollen grains frequently land?
s
t
i
g
m
a
What is a period during which a plant embryo is alive but not growing?
d
o
r
m
a
n
c
y
Which part of a flower is where haploid male gametophytes are produced?
a
n
t
h
e
r
What is a long, trailing plant stem that produces roots when it touches the ground?
s
t
o
l
o
n
What is the process when buds are used as scions?
b
u
d
d
i
n
g
In a flower, what part contains one or more ovules?
o
v
a
r
y
e
n
d
o
Hidden Word: g
s
p
e
e
r
r
m
m
i
n
a
t
i
o
n
Definition: The early growth stage of a plant embryo
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What is the food-rich tissue that nourishes a seedling as it grows?