Question

Which group of organisms are not constituents of a food chain?

Answer 1

Correct option is C. Wolf, grass, snake, tiger
The food chain is a series of organisms in which an organism is eating one and being eaten by others. A food chain consists of producers, primary consumers, secondary consumers, tertiary consumers and decomposers at successive trophic levels. Among all given options, option A and D are representing the correct organisms of a food chain.

In option A, the grass is the producer, the rabbit is primary consumer feeding on grass, the wolf is secondary consumer feeding on rabbit and lion is tertiary consumer feeding on the wolf.

In option D, the grass is a producer, the grasshopper is primary consumer feeding on grass, a frog is secondary consumer feeding on a grasshopper, the snake is tertiary consumer feeding on frog and eagle is quaternary consumer feeding on a snake.

Hence the group of organisms in options B and C are not constituents of a food chain

So, the correct answer is options 'B and C'