Question
In a stable natural ecosystem, how is the supply of nutrients and energy maintained?
A. Nutrients and energy are efficiently cycled within the ecosystem.
B. Energy from the Sun is cycled through the food chains, while nutrients are constantly lost.
C. Nutrients are efficiently cycled within the ecosystem, while there is a constant flow of energy.
D. Energy is cycled through photosynthesis and respiration, while food chains ensure that nutrients flow through the ecosystem.
▶️Answer/Explanation
Ans. C
Question
The diagram shows part of a food chain. The left box represents producers and the right box primary consumers. Arrows show energy flows.
Which forms of energy are represented by X and Y?
▶️Answer/Explanation
Ans:D
Question
The diagram shows interactions between food chains in an ecosystem in the African savannah.
Which arrows indicate the flow of chemical energy?
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
▶️Answer/Explanation
Ans:C
Question
Which processes occur in an ecosystem?
I. Biomass increases in each successive trophic level.
II. Inorganic nutrients are recycled.
III. Chemical energy is stored in carbon compounds.
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
▶️Answer/Explanation
Ans:C