Which is the primary consumer in this chain?

The diagram represents the energy flow through a food chain. What provides the energy source (X) for this food chain?

Which diagram shows the path of the energy flow in an ecosystem?

The diagram represents a food web. The letters represent organisms, and the arrows show the direction of the flow of energy. Which statement is correct?

The food web shows feeding relationships in a lake.

All of the perch are killed in water pollution. How will this affect the food web?

The diagram shows the energy losses and gains of a rabbit, What percentage of energy is used for growth and repair?

The diagram shows a pyramid of numbers in a woodland ecosystem. This shows the number of individuals at each trophic level. At which trophic level are the individual organisms largest in size?

The diagram shows part of the carbon cycle. Which arrow represents photosynthesis?

The diagram shows part of a food web. Which is a pyramid of numbers based on this food web?

The diagram shows the carbon cycle. Which part of the cycle contains food chains?

What is the producer in the energy-flow diagram shown?

The diagram shows how carbon circulates in nature. Through which stage does most energy flow?

Insect larvae feed on the leaves of trees.

A hawk eats small birds which feed on these larvae.

The diagram shows the pyramid of numbers and pyramid of biomass.

Which level represents the small birds in the pyramid of biomass?

In a tropical rainforest which of these processes is linked to the removal of carbon dioxide from the atmosphere?