CBSE Class 7 Answered

The sequential process of eating and being eaten is called a food chain.

Grass → Grasshopper → Snake → Hawk → Fungi

• All food chains begin with green plants or producers. Thus, the plants or producers constitute the first trophic level. Example: Grass
• The herbivores or primary consumers that feed on plants constitute the second trophic level. Example: Grasshopper
• The herbivores are next fed upon by the carnivores or secondary consumers. They constitute the third trophic level. Example: Snake
• Finally, the large carnivores, also called the top carnivores or tertiary consumers, form the fourth trophic level. Example: Hawk
• The large carnivores die and form the feed of decomposers. The decomposers feed on these dead animals and plants. Example: Fungi
• There is a transfer of food from one organism to the other forming a chain.