[单选题]
The illustration shows a rice cul
n 8xvc92jtoqoe;9* l5,;uq4o bg ytnr tivation system that elimi
zq dkhu 0+,6k/lte- xunates the need for fertilizers, herbicides and pesticides by raising ducks in rice paddies. Additionally, Azolla, an aquatic floating fer
dulkq0h/-u,xte 6zk +n, is grown in these fields because they harbour blue-green algae that fixes $N_2$. This system produces duck, fish and rice for human consumption.
What would be a possible food chain for the rice cultivation system shown in the image?
A. algae → fish → duck → human
B. algae ← fish ← duck ← human
C. insects → algae → duck → human
D. insects ← algae ← duck ← human
参考答案:
A
本题详细解析:
Explanation:
Algae is a producer, (Choice B), but the arrows show the flow of energy in the wrong direction. The food chain cannot start with insects (Choice C) as it is not an autotroph. Algae do not eat ducks and ducks do not eat humans (Choice D).
