Which of the following constitute a food-chain?
(a) Grass, wheat and mango
(b) Grass, goat and human
(c) Goat, cow and elephant
(d) Grass, fish and goat
Answer
Let’s study all the examples
(a) Grass, wheat and mango
Grass, wheat and mango are all producers.
Hence, they can not form a food-chain.
(b) Grass, goat and human
Grass is a producer.
Goat is a herbivore which eats grass.
Human is an omnivore which can eat goat.
Hence, (b) forms a food chain.
(c) Goat, cow and elephant
Goat, cow and elephant are all herbivores.
Hence, they can’t feed on one another.
(d) Grass, fish and goat
Grass is a producer.
Fish is an omnivore.
But, goat is a herbivore. Therefore, it can feed on the fish.
Hence, they cant form a food chain.