Question
The diagram shows the carbon cycle. Which letter indicates respiration?
Answer/Explanation
Markscheme
B
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
Question
In ecosystems the amount of energy that passes from one trophic level to the next is called the conversion efficiency. What is the average conversion efficiency from primary to secondary consumers in most ecosystems?
A. 1 %
B. 10 %
C. 50 %
D. 90 %
Answer/Explanation
Markscheme
B
Question
What is exchanged between a sealed mesocosm and the surrounding external environment?
A. Energy
B. Water
C. Air
D. Nothing can pass
▶️Answer/Explanation
A