Homework Sheet
1.
What do the arrows in a food chain show us?
2.
Here are some food chains, use them to make a food web on the next page.
green algae
→
midges
→
net spinning caddis fly
green algae
→
midges
→
green algae
→
black fly
→
net spinning caddis fly
green algae
→
black fly
→
net spinning caddis fly
→
frog
→
frog
1
pond skater
3.
What type of organism does every food chain begin with?
4.
Look at this food web.
Write down as many food chains as you can find on the next page.
eagle
falcon
skylark
rabbit
spider
insects
heather
N.B. Illustrations not drawn to scale.
grouse
2.
4.
Homework Sheet
1
The dodo is one famous example of an extinct animal. This flightless
bird was first discovered around 1600, when sailors first landed on
the island of Mauritius. For many years the dodo had lived an easy
life, roaming the forests on the island where there was plenty of food
and shelter for nesting. Because the dodo was one of the largest animals
on the island, there were no natural predators hunting it.
When the sailors landed on Mauritius they began to hunt the dodo for food.
However as well as the sailors hunting the dodo, the cats and rats which lived on the ships came on
to the island and also began to hunt the dodo. The dodo was an easy bird to catch and very quickly
the population became very small. As well as looking for food, the sailors also landed on the island
looking for wood. To repair their ships, the sailors took trees that they had chopped down in the forests
on the island. The forest gradually grew smaller, and as the forest shrank the population of dodos
became smaller and smaller until the last dodo was seen in 1680.
a.
Give two reasons why life on Mauritius was easy for the dodo.
1.
2.
c.
Suggest a reason why the passage says ‘The dodo was an easy bird to catch… ’.
d.
Apart from hunting, what else did the sailors do that affected the dodos?
e.
How long did it take for the dodo to become extinct?
Homework
2
Food webs
Look at the food web below and write down five different food chains.
hawk
snake
frog
grasshopper
marsh grass
1.
2.
3.
4.
5.
cricket
cat tail
N.B. Illustrations not drawn to scale.
shrew
Homework
2
Making food webs
Use the food chains below to construct a food web
only appears in the food web
).
(remember the organism’s name
green plant
herring
seal
green plant
herring
killer whale
green plant
mosquito
salmon
N.B. Illustrations not to scale.
Construct another food web using the table below.
ANIMAL
FOOD
slug
dandelion
rabbit
dandelion; grass
cow
dandelion; grass
fox
rabbit; frog
frog
slug
killer whale
Homework Sheet
The diagram opposite
shows part of a pond
food web.
pike
water beetle
perch
tadpole
minnow
N.B. Illustrations not drawn to scale.
1.
3
water weed
Use the words increase, decrease or stay the same to suggest what might happen to the minnows
and water beetles if all the tadpoles were removed.
Minnows would
Reason
Water beetles would
Reason
Homework
2. The food chains below are examples of food chains found in
a.
heather
→
vole
→
owl
heather
→
grouse
→
fox
heather
→
grouse
→
golden eagle
heather
→
vole
→
fox
Use the food chains above to construct a food web.
The grouse population dies out and this affects the other populations in the web.
b.
Describe what will happen to the populations below (i.e. increase or decrease) and give a
reason to explain your choice.
The vole population will
because
The fox population will
because
c.
Suggest a reason why heather will only grow on an open hillside and not under
the cover of a forest.
3
Homework
3
Upsetting a food web
hawk
shrew
wagtail
wasp
chafer beetle
caterpillar
roots
flower
3. Use the food web to predict what would happen to the number of
died of a disease.
leaf
if the wasps
Prediction
Reason
Look at the food web again and explain why the numbers of
the wasps all died.
Explanation
might go up if
N.B. Illustrations not drawn to scale.
moth
Homework
Abiotic factors
Complete the diagram below.
ABIOTIC FACTORS
Explain what is meant by abiotic factor.
4
Homework 4
2.
Different plants like to grow in different places. Each environment has its own set of conditions,
with different levels of abiotic factors.
Choose two different abiotic factors and describe how you would measure them.
Factor 1
How it would be measured:
Factor 2
How it would be measured:
3.
Which of the following statements are true and which are false?
An organism’s
is where it lives
All the living things in an ecosystem is the population.
Consumers are organisms that can make their own food.
Producers are plants that can make their own food.
Homework
1.
Which of the following is an abiotic factor, affecting where organisms are found?
a) food
b) disease
c) light
d) predators
2.
What piece of apparatus would you use to measure this abiotic factor?
3.
Name another two abiotic factors.
4.
The table below shows the changes in numbers of pond skaters in a year.
MONTH
NUMBERS PER ML
January
February
March
April
May
June
July
August
September
October
November
December
5
7
14
25
30
35
45
45
40
20
10
6
a)
Use the information to draw a
b)
What happens to the numbers of pond skaters from January to July?
c)
During which two months is the number of pond skaters at their lowest?
d)
Suggest a reason for the low numbers in these two months.
e)
Suggest what the pond skaters have to compete for during the months of July and August?
on the next page.
5
Homework
5.
5
The table below show the results of a plant survey and light intensity
A = dark
6.
light intensity
A
A
G
H
I
C
B
B
A
% daisies
10
9
60
70
65
12
11
10
10
a)
Do you think daisies grow best in light or dark conditions?
b)
Explain how you reached your answer.
I = bright
The table below shows a survey of worms and moisture values taken from a garden.
1 = dry
7.
moisture content
10
10
9
8
7
5
2
1
1
number of worms
120
110
90
90
60
40
5
3
3
a)
In what sort of soil would you find most worms?
b)
How would you test the soil to find out how much moisture was present?
10 = damp
Some animals and plants are endangered species, and some animals and plants are extinct.
Explain the difference between endangered and extinct.
Name two animal species which are endangered.
8.
Using an example, explain why it is important for plants and animals to be adapted to their
environment.
Homework
5
Places where plants like to grow…
6. The table below shows the results from a plant survey and light intensity.
AREA
1
2
3
4
5
6
7
8
9
10
light
intensity
A
B
C
D
E
F
G
H
H
H
DARK
BRIGHT
PLANT TYPE NUMBERS
daisies
0
0
0
0
5
11
16
19
22
22
wood
sorrel
20
15
15
10
10
5
0
0
0
0
Which plant grows best in light conditions?
Which plant is found only growing in darker conditions?
The table below shows another survey of plants and moisture values.
AREA
1
2
3
4
5
6
7
8
9
10
moisture
content
8
7
7
7
7
5
5
3
2
1
WET
DRY
PLANT TYPE NUMBERS
Plant A
2
2
3
2
3
4
5
7
10
12
Plant B
24
22
20
20
19
10
3
3
1
0
Which area has the most moisture?
Which area has the least moisture?
Does Plant B grow best in wet or dry conditions?
Name the piece of apparatus you would use to measure moisture and describe how it is used.
Homework
The plant competition
Look at the diagrams below; what might the plants in Dish 3 be competing for?
Dish 1
Dish 2
1.
2.
3.
Identify factors kept the same to give a fair comparison between the dishes.
1.
2.
3.
Dish 3
6
Homework 6
2.
Mrs. Smith notices that rabbits eat the lettuces in her garden. There is also a fox, which hunts
and eats the rabbits. Greenfly also eat the lettuce, but thankfully ladybirds eat these annoying
insects. The fox also eats blackbirds eggs if it finds the nest. Blackbirds eat worms and
ladybirds. Worms are actually good for the soil because their burrowing lets oxygen into the soil
and they eat dead lettuce leaves that drop to the ground.
Use the information to construct a food web
3.
Grey squirrels are not native to Britain.
The introduction of the grey squirrel has affected red squirrels.
Select the correct options to complete the statement below.
Since the arrival of the grey squirrel,
the population of red squirrels has
Because they are similar species,
the competition between them is
increased
decreased
greater
less
Homework
1.
What word is used to describe the process plants use to make starch?
2.
Which of the samples recorded in the table below contains
starch.
3.
4.
Sample
Colour with iodine
A
orange
B
black
Put the following stages into the correct
A
Rinse the leaf in warm
water.
B
Boil leaf in water.
C
Cover in iodine.
D
Boil leaf in ethanol.
What precaution must be taken when we are using ethanol?
7
Homework
5.
Brad and Jennifer, two pupils were carrying out a leaf test on a leaf with green and
white
stripes. They found that not all of the leaf was making starch.
Which parts of the leaf were able to make starch?
Use the chemicals listed below to answer the following
iodine
starch
carbon dioxide
ethanol
oxygen
chlorophyll
water
light
6.
Choose the two raw materials for
7.
Where does the energy for photosynthesis come
from?
8.
What useful gas is made by photosynthesis?
7
Homework Sheet
1.
Write a word equation to summarise photosynthesis.
2.
Complete the table
Type of use
Name of plant
Details
medicine
food
raw materials
raw materials
3.
Describe another important role that plants play.
TRUE/FALSE
4.
Chlorophyll is a raw material for photosynthesis.
5.
Starch is a product of photosynthesis.
6.
A variable leaf has green and white parts.
7.
Alcohol dissolves chlorophyll.
8
Homework 8
8. Three containers A, B and C were set up to investigate seed
= no germination
= germination
A
30 ml water
a.
C
5 ml water
What is the ratio of seeds germinated in A to B?
A
b.
B
20 ml water
:B
Calculate the percentage of seeds which germinated in each dish.
dish
volume of water (ml)
A
30
B
20
C
5
% germination
c.
Draw a line graph with volume of water against percentage germination.
d.
What would the percentage germination be if 10 ml of water were added?
e.
Suggest one way to improve this investigation.
%
Homework
9.
What are the two products of photosynthesis?
directional light
10.
Fred and Holly used the table below to record their results using the experiment
above. Put the correct number of oxygen bubbles in the correct place in the
table.
17
48
Situation
plant left in the dark
lamp 1 metre away
lamp 10 cm away
0
Number of oxygen bubbles
per minute
8