Download Year 7 Science 7B1: Microscopes, Cells and Plant Reproduction

Year 7 Science
7B1: Microscopes, Cells and
Plant Reproduction
Home-Learning Challenge
Name: ________________________________________
Form: ___________
Task Sheet 1 (Bronze Challenge): What parts does a microscope have?
Use the words in the boxes below to label the parts of the microscope.
Task Sheet 2 (Bronze Challenge): How are plant and animal cells different?
Animal Cell
Plant Cell
Key:
= cell membrane
= cell wall
= cytoplasm
= vacuole
= nucleus
= chloroplast
Choose six colours; one for each part of the cell (organelle). Use these colours
to colour code the parts of the cells above and the key.
Complete the table below.
Cell organelles that are found in
plant AND animal cells
Cell organelles that are ONLY found
in plant cells
Task Sheet 3 (Bronze Challenge): What do the organelles of a cell do?
Match the names of the cell organelles to their function (job).
nucleus
This surrounds the cell and
controls what goes in and out.
cell membrane
This is liquid. It is where the
chemical reactions take place.
cytoplasm
This controls everything that
happens in the cell.
cell wall
This is green and absorbs
sunlight to help plant cells make
food.
vacuole
This is a tough layer that helps
to support the cell.
chloroplast
This is a liquid and is only found
in plant cells.
Task Sheet 4 (Bronze Challenge): The Structure of a Flower
1. Use words from the box to label the parts of the flower.
2. Colour the female parts of the flower one colour and the male parts of the flower
another colour. Make sure you colour in the key to show which is which.
Key:
= female parts of the flower
= male parts of the flower
Words:
petal
sepal
filament
stamen
nectary
ovule
stigma
style
ovary
anther
carpel
Task Sheet 5 (Bronze Challenge): Specialised Cells
Link the image of the specialised cell to its name and function.
sperm cell
Absorbs light which
the plant uses to make
food.
ovum (egg)
cell
Absorbs water and
mineral ions from the
soil.
root hair
cell
Fertilises an egg cell.
palisade
cell
Carries oxygen to the
cells that need it.
cilia cell
Joins with a sperm cell
and provides food for
the new cell which
forms,
red blood
cell
Have tiny hairs that
help to sweep mucus
and particles out of
the respiratory
system.
Task Sheet 6 (Silver Challenge): Euglena – Plant or Animal Cell?
You are going to use the evidence to decide whether the single cell organism Euglena is a
plant cell, an animal cell, both or neither.
Read the statements below and decide whether each one is evidence for Euglena being a
plant cell, an animal cell, both or neither – write each statement into the appropriate column
in the table on the next page.
Make a decision as to which category Euglena best fits into and write an argument to justify
your decision using the suggested sentence starters. Don’t forget to write in full sentences,
use persuasive language and punctuation.
Evidence:
Euglena has two outer layers.
Euglena contains cytoplasm.
There are more than two
classification groups.
Euglena confused early scientists.
Euglena contains chloroplasts.
Euglena can change its shape.
Euglena has a nucleus.
Euglena live in ponds and puddles.
Euglena is a single cell.
Euglena can swim through water.
Euglena can absorb food from its
surroundings.
Euglena can make its own food.
Euglena is normally green.
Euglena has a vacuole.
A vacuole controls the amount of
liquid in a cell.
Euglena is light sensitive.
Chloroplasts enable a cell to
photosynthesise.
Euglena is temperature sensitive.
The nucleus contains DNA and controls the cell activities.
Evidence that suggests
Euglena is a plant cell
Evidence that suggests
Euglena is an animal cell
Evidence that suggests
Euglena is either a plant or
an animal cell
Evidence that suggests
Euglena is neither a plant
nor an animal cell
I think that Euglena is ………………………………………………………………………………………………………………………
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The evidence to support my decision is ……………………………………………………………………………………
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The evidence to refute my decision is ………………………………………………………………………………………
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However, I think the evidence to support my decision is stronger because …………
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In conclusion, ……………………………………………………………………………………………………………………………………………
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Task Sheet 7 (Silver Challenge): Investigating Pollen Tube Growth
Katie and Roisin decided to find out what effect the concentration of sugar
solution would have on the length that pollen tubes grow to.
Their results are shown in the table below.
Concentration of sugar solution / % Average length of pollen tube / mm
5
10
15
20
25
30
35
40
2
4
7
8
11
15
12
7
1. Use the data in the table to draw a line graph of average length of pollen tube (yaxis) against concentration of sugar solution (x-axis) on the graph paper on the
next page.
Remember to use pencil and ruler, label both axes with a quantity and a unit and
draw a line of best fit through the plotted points.
2. At which concentration did the pollen tubes grow best? ……………………………………………
3. Katie and Roisin’s teacher said that these results were not enough to say which
concentration of sugar produced the most growth.
What should Katie and Roisin do to be certain of their conclusion?
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4. What do you think the average length of the pollen tube would be if the sugar
solution had a concentration of 45%? ……………………………………………………………………
Task Sheet 8 (Gold Challenge): The Journey of a Seed
You are going to write a short story about the journey of a seed. You need to
imagine that you are the seed and describe the journey you took.
Use the information below to help you plan and write your story on the lined
paper following these instructions. If you run out of space you can use extra
lined paper. You can also type it on the computer if you prefer.
Choose one of the following seeds to write about:
 sycamore seed
 pond iris seeds
 burdock seed
Top Tips:
1. You should write in the first person; so use words such as I, me, mine and my.
2. Write in the past tense as you are describing a journey that happened in the
past.
3. Try to include as much detail as possible.
4. Use as many key words from the glossary at the back of the booklet as
possible. The sections you should use are ‘flowers’, ‘plant reproduction’ and
‘seed dispersal’.
You must include descriptions of:
 How you (the seed) were produced – so describe what happened during
pollination and fertilisation in the flower that made you. Consider…
− What is pollination? Describe it.
− Was the flower pollinated by an insect, the wind or by some other
means?
− If it was insect pollinated, what was the insect? What attracted it to
the flower - colour, scent or something else?
− If it was wind pollinated, how was the flower adapted for this?
− What is fertilisation? Describe it.
− How and where did you (the seed) form?
 How you (the seed) were dispersed to a different location.
 How you (the seed) developed into a new plant.
Some suggested sentence starters (you can use some, all or none of these
– it is up to you!):
I was created when a bee landed on a flower. The bee was searching for nectar
and was attracted to the flower because…
When the bee landed on the flower pollen grains from the anthers got stuck
to…
Next the bee moved to another flower and…
After pollination a pollen tube grew from the pollen down the…
During fertilisation the…
Once I had become a seed…
Finally I…
Connectives you might like to use:
…firstly…
…also…
…consequently…
…secondly…
…in addition…
…simultaneously…
…next…
…while…
…finally…
…then…
…gradually…
My Story:
I am a ……………………………………………………… seed. I am going to tell you about my journey.
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Task Sheet 9 (Gold Challenge): How Big?
When we use a microscope the object we are looking at is magnified.
The magnification depends on which lens we use.
The eyepiece lens has a magnification of x10. So if we just looked through this lens the
object would look ten times bigger. There are three objective lenses; these also magnify the
object. So the object is first magnified by the objective lens and then by the eyepiece lens.
The total magnification is the two multiplied together.
1. Complete the table below to show the total magnification.
Magnification of
eyepiece lens
Magnification of
objective lens
Total magnification
x 10
x4
x 40
x 10
x 10
x 10
x 40
2. Complete the gaps in the table below. Use a calculator to help you.
Object being
observed under
the microscope
Real size /
mm
Magnification
of eyepiece
lens
Magnification
of objective
lens
Total
magnification
Size object
appears / mm
Amoeba
0.74
x 10
x4
x 40
29.6
Bacteria
0.005
x 10
x 40
Human hair
(thickness)
0.02
x 10
x 10
Red blood cell
0.006
x 10
x 100
White blood
cell
0.008
x 10
x 400
Fruit fly
x 10
x4
120
Sperm cell
x 10
x 100
2.5
Egg cell
x 10
x 40
4
Key Words Glossary
Microscopes and Cells:
microscope
magnification
nucleus
cell membrane
cytoplasm
chloroplast
vacuole
cell wall
mitochondria
respiration
cell
tissue
organ
organ system
Specialised Cells:
sperm cell
ovum (egg) cell
nerve cell
palisade cell
root hair cell
cilia cell
epithelial cell
red blood cell
Human Organ Systems:
excretory system
circulatory system
digestive system
respiratory system
reproductive system
nervous system
endocrine system
skeletal system
muscle system
Unicellular Organisms:
unicellular
amoeba
euglena
flagellum
Diffusion:
diffusion
concentration
particles
Flowers:
petal
sepal
stamen
anther
filament
carpel
stigma
ovary
Plant Reproduction:
pollination
fertilisation
seed
germination
tropism
external
stimuli
Seed dispersal:
seed dispersal
wind dispersal
animal dispersal
water dispersal
explosive