New
New
Year 7

Food webs

I can explain what is shown by a food web diagram and explain the effects that a change in the size of a population could have on other populations in the same community.

New
New
Year 7

Food webs

I can explain what is shown by a food web diagram and explain the effects that a change in the size of a population could have on other populations in the same community.

Lesson details

Key learning points

  1. A community of organisms is made up of interacting populations of species.
  2. A food web diagram represents several interconnected food chains within a community of organisms.
  3. A change in the size of a population will affect other populations in the food web.

Common misconception

Changes in population within a food web will only impact organisms within the same food chain.

Exemplify that disappearance of one population could affect populations in all parts of the food web (CfU questions address this also).

Keywords

  • Habitat - A habitat is the place where an organism lives. It must provide food, shelter and a place to reproduce.

  • Population - A group of organisms of the same type in the same place is called a population.

  • Community - A community is made up of all the organisms that live in the same place.

  • Food chain - A food chain diagram shows how food is transferred from one population of organisms to another.

  • Food web - A food web diagram shows how all food chains interact with each other.

Engage pupils in developing their own food webs, linking to their own knowledge and interests. Use examples of how changing populations of organisms can impact all other populations in a food web.
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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6 Questions

Q1.
What do the arrows in a food chain diagram represent?
The arrows mean ‘eats’.
Correct answer: The arrows mean ‘is food for’.
Correct answer: The arrows show the direction that food moves along the food chain.
Q2.
A is the number of organisms, of the same type, that live in a given area.
Correct Answer: Population
Q3.
What is a primary consumer?
An organism that makes its own food from sunlight and chemicals.
An organism that eats secondary consumers.
Correct answer: An organism that eats producers.
Q4.
How many prey are there in the food chain diagram below?
An image in a quiz
One
Two
Correct answer: Three
Four
Five
Q5.
Match the organism in the food chain to the correct description.
An image in a quiz
Correct Answer:Grass,Producer

Producer

Correct Answer:Scrub hare,Primary consumer

Primary consumer

Correct Answer:Baboon,Secondary consumer

Secondary consumer

Correct Answer:Cheetah,Tertiary consumer

Tertiary consumer

Q6.
Match the statements with the organism that appears in this food chain.
An image in a quiz
Correct Answer:Algae,make their own food.

make their own food.

Correct Answer:Water beetle,is the prey of frogs.

is the prey of frogs.

Correct Answer:Frog,is a predator of water beetles.

is a predator of water beetles.

Correct Answer:Kingfisher, is an apex predator.

is an apex predator.

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6 Questions

Q1.
A is made up of all the living organisms that live in the same place.
Correct Answer: community
Q2.
Which of the following is an example of a population?
All the trees in a forest.
All the plants and animals in a forest.
Correct answer: All the oak trees in a forest.
All the animals in a forest.
Q3.
The fish in the picture is streamlined in shape and has a mouth that can act as a sucker. What habitat do you think this fish lives in?
An image in a quiz
A deep pond.
A slow moving river.
Correct answer: A fast flowing stream.
The sea.
Q4.
Below are three food chains. Which food web correctly shows all three food chains?
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
An image in a quiz
An image in a quiz
Q5.
How many food chains make up the food web diagram?
An image in a quiz
Four
Five
Six
Seven
Correct answer: Eight
Q6.
What might happen if all the rabbits died?
An image in a quiz
The population of hawks would increase because there are fewer rabbits to eat.
The population of grass would decrease because more grasshoppers would eat it.
Correct answer: The population of lizards would decrease because the hawks eat more of them.
The population of snakes would increase because there are no rabbits.
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