Energy for Life Homework 1

S2 Science

Energy for Life

Homework Booklet

Energy for Life Homework 2

Homework 1

1. Complete the following sentences using the word bank below to help you.

photosynthesis, carbon dioxide, water, green, light, starch

(a) The gas _______________ _______________ is taken in by the leaves

of a _______________ plant.

(b) _______________ is taken in by the roots of a plant and

_______________ energy from the sun is absorbed by the green pigments

in the leaves.

(c) The process by which green plants convert these products into the food

_______________ is called _______________.

2. (a) What chemical would be used to test a leaf for the presence of starch?

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(b) Describe the colour change that occurs when this chemical gives a positive

test for starch.

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Energy for Life Homework 3

3. The stages for testing a leaf for starch are shown below.

Arrange them in the correct order. The first one has been done for you.

1. Bunsen burner is turned off.

2. Leaf is on a tile and flooded with iodine solution.

3. Leaf is taken out of the beaker of water and put into a test tube of ethanol.

4. Leaf is rinsed in water to soften it.

5. Leaf is put in a beaker of boiling water.

6. Leaf is taken out of the test tube of ethanol when the ethanol turns green

and the leaf turns white.

5-______-______-______-______-______

[END OF HOMEWORK]

Energy for Life Homework 4

Homework 2

1. Use the internet and YouTube to find and listen to the Photosynthesis

Song.

Write out the lyrics under a suitable heading.

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Energy for Life Homework 5

2. The key below can be used to identify species of trees from the shape

of their leaves.

Answer the following questions using the Key below to help you.

(a) Which tree leaf has a wavy leaf edge?

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(b) Name 1 difference between Beech leaves and Laurel leaves.

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(c) Name 1 similarity between Beech leaves and laurel leaves.

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(d) Which leaf is made up of many parts that are attached to a single point of the

stalk?

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[END OF HOMEWORK]

Energy for Life Homework 6

Homework 3

1.

(b) What living organism makes its own food using energy from the sun?

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2. Complete the following sentence by underlining the correct word from the choice

in brackets.

are always at the start of a food chain. Animals that only

eat green plants are known as .

Animals that eat green plants and other animals are known as

Animals that eat only other animals are known as .

Green plants

Animals

herbivores

carnivores

omnivores

carnivores .

herbivores

carnivores

Energy for Life Homework 7

3(a) What word would describe an animal that hunts other animals for food?

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(b) What word would describe an animal that is hunted by other animals?

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4. A study was carried out to show the percentage of organisms living in the Sahara

ecosystem. The results are shown in the table below.

Type of Organism Number of organisms

(percentage)

Producer 50

Herbivore 30

Carnivore 15

Omnivore 5

Use this information to construct a pie chart.

Remember to add labels to each section of your pie chart and to use a ruler.

[END OF HOMEWORK]

Energy for Life Homework 8

Homework 4

1. The diagram below shows a simple pond food web. Use this food web to answer the

following questions.

(a) Name a producer in the food web above.

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(b) Name a carnivore in the food web.

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(c) Name a herbivore in the food web.

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(d) Draw out 2 food chains using any organisms from the food web above.

Space for food chains:

Energy for Life Homework 9

(e) All organisms in a food web or food chain are separated by arrows.

What do the arrows represent?

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(f) What would happen to the numbers of dragon larvae if the numbers of

tadpoles decreased?

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Why? _____________________________________________

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2. What type of energy is lost from a food chain?

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Energy for Life Homework 10

3. A study was conducted to find out how many different organisms were living in the

pond. The results are shown in the table below.

Organism Number living in the pond

Algae 50

Snails 40

Ducks 5

Mosquito Larvae 5

Tadpoles 20

Water Fleas 25

Minnows 5

Dragonfly Larvae 30

Use the information in this table to construct a bar chart.

Remember: > Graphs must be drawn using a pencil and a ruler

> Graphs must have an even scale and labels to both axes

Use the graph paper on the next page.

Energy for Life Homework 11

[END OF HOMEWORK]

Energy for Life Homework 12

Homework 5

1. Name three resources that animals compete for.

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2. Name three resources that plants compete for.

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3. When does competition between living organisms most likely occur?

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4. Any plants and animals that fail to successfully compete for resources will die out.

Why is this an advantage to the rest of the plants and animals?

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Energy for Life Homework 13

5.

Use the diagrams above to answer the following questions:

(a) Which 2 pots should be used to investigate if seeds grow better in sand or

peat?

Pot _______and _______

(b) Which 2 pots should be used to investigate the effect of temperature?

Pot _______and _______

(c) What do you think pots 1 and 5 are used to investigate?

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Energy for Life Homework 14

6. The diagram below shows how a pupil set up their germination experiment to

investigate spacing.

Explain why this experiment was set up wrongly and will not give fair results.

(HINT: what should be changed in this experiment?)

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[END OF HOMEWORK]

cress

Energy for Life Homework 15

Homework 6

1. (a) What is the meaning of the term “biodiversity”?

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(b) Name a human activity that can reduce biodiversity.

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(c) Look at the two food webs below:

(i) Which one has a high level of biodiversity?

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(ii) Give a reason for your answer.

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Energy for Life Homework 16

[END OF HOMEWORK]

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