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

In ecology, a food chain illustrates how energy and nutrients flow through different organisms in an ecosystem. Among the options provided, the correct answer is:

Correct Answer: B. Grass, Goat and Human

This option represents a clear food chain where:

• Grass serves as the primary producer, converting sunlight into energy.
• Goat acts as a primary consumer, feeding on the grass.
• Human is a secondary consumer, as they can eat goats.

Other options do not form a complete food chain as they lack a clear flow of energy from producers to consumers. For example:

• Option A includes only plants.
• Option C consists of herbivores without a clear producer.
• Option D mixes different types of consumers without a direct energy flow.

Thus, B is the only option that effectively illustrates a food chain.