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Food chains and webs

All food chains start with a producer. This is a living thing which makes its own food. Green plants
are producers because they use sunlight energy to produce food by photosynthesis.

The rest of the organisms in a food chain are consumers. A consumer is a…

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Energy is lost from a food web when it is used for movement or converted to heat. This means
that an organism converts only a small percentage of the food it eats into new cells. For this reason
there are usually fewer organisms at each stage of a food chain.…

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Sample questions and answers
Here are some typical Standard Grade questions. Use the information in the revision bite to
help answer them if you are unsure. Look at the answer after you have tried each one.
Question 1
the graph below shows how a population of microorganisms changes over a…

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(c) The population was 400 at 10 hours. Double that is 400 x 2 = 800.
The curve reaches 800 at 40 hours. So it takes 30 hours to double.

Examiner's Note
Well done! Being able to see trends in graphs is an important mark getting skill. You
remembered to…

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Happening Hints
For your biology exam you should be able to:

follow a food chain through a food web
suggest what would happen in a food web if one species was removed
say what is meant by a pyramid of numbers and a pyramid of biomass
explain how the size…

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Top of Form




How it Works
The diagram shows part of a food web on a oak tree.






Use the web above to answer questions 1 to 6 by entering the corresponding number in the boxes
below.

1. wasp 4. spider


2. caterpillar 5. greenfly 7. hoverfly


3. blue tit…

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a. spider

b. hoverfly

c. caterpillar

d. wasp
6.
The diagram below represents a simple food chain.






The diagram shows a:

a. Pyramid of numbers

b. Pyramid of biomass
Use the nitrogen cycle diagram below to answer questions 7 to 10.

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Match the letters on the diagram with the statements below. Type your answers in the boxes
provided

7. The decay of dead plant and animal material by bacteria and fungi:

8. The addition of extra nutrients by farmers as fertilisers:

9. Nodules on the roots of clover that fixes nitrogen…

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