Yes the correct option is C.

EXPLANATION:-

In the food chain , the first organism should be producer.But here, the first organism is which is already a consumer. A wolf cannot consume grass.Obviously grass cannot consume snake and snake cannot consume a tiger.

Hence, the following food chain does not make any sense and the written organisms cannot be the constituents of a food chain.

The correct answer is option 'C', which states that the group of organisms consisting of a wolf, grass, snake, and tiger are not constituents of a food chain. Let's break down the answer and explain in detail.

Food chains are representations of the flow of energy in an ecosystem. They depict the transfer of energy from one organism to another as they consume and are consumed by other organisms. In a food chain, each organism occupies a specific position or level, known as a trophic level, based on their source of energy.

Now, let's analyze the given options:

a) Grass, lion, rabbit:
- Grass is a primary producer, which means it converts sunlight energy into chemical energy through photosynthesis. It occupies the first trophic level.
- The rabbit is a primary consumer that feeds on grass. It occupies the second trophic level.
- The lion is a secondary consumer that preys on the rabbit. It occupies the third trophic level.
- Therefore, this group of organisms (grass, lion, rabbit) forms a food chain: Grass → Rabbit → Lion.

b) Plankton, man, fish, grasshopper:
- Plankton are primary producers that convert sunlight energy into chemical energy. They occupy the first trophic level.
- Fish and grasshopper are primary consumers that feed on plankton. They occupy the second trophic level.
- Man is an omnivore and occupies the third trophic level as a secondary consumer.
- Therefore, this group of organisms (plankton, man, fish, grasshopper) forms a food chain: Plankton → Fish/Grasshopper → Man.

c) Wolf, grass, snake, tiger:
- Grass is a primary producer, occupying the first trophic level.
- The snake is a secondary consumer that feeds on the grasshopper. It occupies the second trophic level.
- The wolf is a tertiary consumer that preys on the snake. It occupies the third trophic level.
- The tiger is also a tertiary consumer that preys on the wolf. It occupies the fourth trophic level.
- However, there is no direct connection between the grass and the wolf, making it impossible to form a food chain within this group of organisms.

d) Frog, snake, eagle, grass, grasshopper:
- Grass is a primary producer, occupying the first trophic level.
- The grasshopper is a primary consumer that feeds on the grass. It occupies the second trophic level.
- The frog is a secondary consumer that preys on the grasshopper. It occupies the third trophic level.
- The snake is a tertiary consumer that preys on the frog. It occupies the fourth trophic level.
- The eagle is also a tertiary consumer that preys on the snake. It occupies the fifth trophic level.
- Therefore, this group of organisms (grass, grasshopper, frog, snake, eagle) forms a food chain: Grass → Grasshopper → Frog → Snake → Eagle.

In conclusion, the group of organisms consisting of a wolf, grass, snake, and tiger does not form a food chain because there is no direct connection between the primary producer (grass) and the top predator (wolf).