MCQ-3: Organisms and their Environment

Which pair of statements about energy flow in ecosystems is correct?

The diagram shows a food chain based on a tree.

Which diagram shows a pyramid of numbers for this food chain?

Which process forms part of the carbon cycle?

Herbivores take in carbon atoms from plants.
How do carbon atoms leave the herbivores?

In which stages in the water cycle is the water in vapour form?

Which structures are present in a bacterial cell?

The whole of an island’s population of short-haired bumblebees is descended from just two parents. These were introduced from the mainland.
Which statement about the island’s short-haired bumblebee population, compared with that of the mainland, is correct?

The diagram shows a pyramid of biomass for a food chain in a woodland ecosystem.

What is the pyramid of numbers for this food chain?

The diagram shows part of the nitrogen cycle.
At which stage is denitrification occurring?

The diagram shows a hydrophyte in a river.

Which statement about the submerged leaves is correct?

In the food chain below, the population of snakes is halved owing to a viral disease.
grass → locusts → snakes → eagles
What effect does this have on the other members of the food chain?

Which of these is a population?

1. all the insects in a rainforest
2. all the tigers in a rainforest
3. all the kapok trees in a rainforest

The processes listed in 1– 4 will affect the concentration of carbon dioxide in the atmosphere.

1.  increased deforestation
2.  increased forestation
3.  decreased fossil fuel combustion
4.  increased fossil fuel combustion

Which processes would increase the concentration of carbon dioxide in the atmosphere?

The graph shows the changes in the populations of predator and prey over a period of time.
Which point on the graph shows a decrease in predator population?

In which processes is light energy converted to chemical energy?

The diagram represents part of an aquatic food web.

Which organisms are primary consumers in this food web?

The diagram shows part of the water cycle.

What are processes S and T?

The diagram shows a food chain.

What is the efficiency of energy transfer between the maize and the lizards in this food chain?

The diagram shows part of a food web from a rainforest.

In this food web, at which trophic level are the anacondas?

Fitness is defined as the probability of an organism …..1….. and …..2….. in the environment in which it is found.
Which words correctly complete gaps 1 and 2?