Ecosystem. — BIO BOTANY STD 12 — Question

Main source of energy for the grazing food chain is the Sun. It begins with the first link, producers (plants). The second link in the food chain is primary consumers (mouse) which get their food from producers. The third link in the food chain is secondary consumers (snake) which get their food from primary consumers. Fourth link in the food chain is tertiary consumers (eagle) which get their food from secondary consumers.
Grass → Mouse → Snake → Eagle
Producers Primary consumers Secondary Consumers Tertiary consumers