Ecosystems – transferring energy test questions - WJEC - GCSE Biology (Single Science) Revision

1

What type of organism starts all food chains?

Consumer

Producer

Carnivore

2

What do the arrows in a food chain represent?

The flow of energy

The flow of heat

The flow of water

3

Which of these is likely to be a herbivore?

Tertiary consumer

Secondary consumer

Primary consumer

4

What would happen to the numbers of owls if a new predator which ate shrews was introduced into this food web?

Their population would increase

Their population would decrease

Their population would not change

5

This is a pyramid of numbers:

Pyramid of biomass labelled 3, 2, 1 from top to bottom.

Which trophic level represents the producer?

A

B

C

6

What is an omnivore?

An animal that eats only other animals

An animal that eats only plants

An animal that eats both plants and animals

7

Approximately how much energy is passed along the food chain at each trophic level?

10%

20%

30%

8

Which of the following is a decomposer in this food web?

Oak tree

Fungi

Leaf litter

9

If 360 kJ entered a trophic level and 82.8 kJ of this was lost as heat, what percentage of the energy was lost as heat?

23%

15%

19%

10

Higher tier only

Energy transfer diagram. From the Primary consumer, 1350 kilojoules of energy is lost. 150 kilojoules passes to the Secondary consumer.

A primary consumer loses 1,350 kJ as heat, through movement and in excrement. 150 kJ is passed on to the next trophic level. Use this equation to calculate the percentage efficiency of energy transfer between the primary and the secondary consumer.

\[\text{efficiency} = \frac{\text{energy transferred to next level}}{\text{total energy in}} \times 100\]

11%

0.1%

10%