Lesson 4: Levels of Organisation

Question 1

How can feeding relationships within a community be represented?

Answer 1

• Feeding relationships within a community can be represented as FOOD CHAINS.

Question 2

What do producers do (in a food chain?)

Answer 2

• Producer synthesises molecules.

Question 3

What do all food chains start with?

Answer 3

• All food chains start with a producer.

Question 4

Give 2 examples of producers that could be in a food chain.
What do these organisms make and by what?

Answer 4

• Green plant OR green algae.
• These organisms make glucose by photosynthesis.

Question 5

What are transects and quadrats used for?

Answer 5

• Transects and quadrats are used by ecologists to determine the distribution and abundance of species in an ecosysetm.

Question 6

What are the levels in a food chain?

Answer 6

Producer —> Primary consumers —> secondary consumers —> tertiary consumers.

Question 7

What is a predator and what is a prey?

Answer 7

• Predators are consumers that kill and eat other animals.
• Prey are organisms eaten by other animals/ consumers.

Question 8

In a stable community, what are the numbers of predators and prey like?

Answer 8

• In a stable community, the numbers of predators and prey rise and fall in cycles.

Question 9

Fill in the gaps

……… organisms are the ……… of biomass for life on Earth.

Answer 9

• Photosynthetic.
• Producers.