Question

Which group of organisms together will not form a food chain?
I. Grass, lion, rabbit, wolf
II. Plankton, man, hawk
III. Lion, grass, snake, tiger
IV. Frog, snake, eagle, grass, grasshopper

• A. I and III
• B. III and IV
• C. II and III
• D. I and IV

Answer 1

The correct option is C II and III

Food chains formed by group I and IV are as follows:
$\bullet$ Group I - Grass $\to$ rabbit $\to$ wolf $\to$ lion.
$\bullet$ Group IV - Grass $\to$ grasshopper $\to$ frog $\to$ snake $\to$ eagle.
$\bullet$ Group II contains hawk and man as consumers. They both do not feed directly on planktons (the producers). Thus, a food chain cannot be formed in this case.
Snakes, tigers, and wolves are carnivorous, they never feed on grass. So, a food chain cannot be formed by group III as well.