MCQ-4: Organisms and their Environment

A food chain has the pyramid of numbers shown.

What is the pyramid of biomass for the same food chain?

The graph shows the changes in a population of brine shrimp over a period of time.

Over which section or sections is the birth rate greater than the death rate?

In which form is nitrogen taken up by the roots of plants?

What is a community?

Decomposers play an important role in the carbon cycle. They release carbon dioxide.
Which process is responsible for this?

The diagram shows how sewage is treated.

Why is air bubbled through the aeration tank?

Which trophic level has the greatest amount of energy?

The diagram shows the energy within the producers in an ecosystem and how much is transferred to primary consumers and eventually lost to the environment.

How much energy is transferred from primary consumers to secondary consumers?

Which is the tertiary consumer in this food chain?

The diagram shows a simple food web.

What must organism J be?

At each stage in a food chain, energy is lost.
What is a result of this?

Which part of the carbon cycle involves the release of energy from food substances in all living cells?

The diagram represents the carbon cycle. Processes involved in the circulation of carbon are numbered 1 to 9.

Which processes are parts of a food web?

The diagram shows part of the water cycle.

Which processes will be slowed down by an increase in humidity?

The diagram shows a food web.
At which level does energy from the Sun enter the food web?

The diagram gives a simplified scheme for energy flow through an ecosystem.

Which processes do the labelled arrows represent?

The food chain shows the number of animals relying on two bushes for their survival.
At which step in the food chain do the organisms have the greatest amount of energy?

The diagram shows the carbon cycle.
Which process produces carbon dioxide from substances made by photosynthesis millions of years ago?

The diagram shows part of the carbon cycle.

Which numbers represent excretion?

The diagram shows a food chain.
mahogany tree → caterpillar → small bird → owl
In this food chain, which population has the largest biomass and which has the largest population size?