[单选题]
The illustration shows a rice cultivat
h p+i q1lwcm..ion system that eliminates the need
,,wj :/)le*x+l wbv ;zp k*qt0nfeaxd for fertilizers, herbicides and pesticides by raising ducks in rice paddies. A
epj+xkd)xbz,w:fae w;0 lnv*t/ql*,dditionally, Azolla, an aquatic floating fern, 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).
