What is a food chain? Draw a food chain with four trophic levels and label each level. How is a food web different?

1. 1 · Define. A food chain is a series of organisms in which each feeds on the one before it. Each step is a trophic level.
2. 2 · Draw the chain. [Grass → grasshopper → frog → snake, arrows from food to eater, T1 to T4 written under each]
3. 3 · Label the levels.
   • T1: producer (grass)
   • T2: herbivore (grasshopper)
   • T3: carnivore (frog)
   • T4: large carnivore (snake)
4. 4 · Explain a food web. Many food chains linked together, because animals eat more than one kind of food.
5. 5 · Real life. Owls and snakes eating rats in paddy fields protect the grain.
6. 6 · Close in one line. Food chains and food webs show who eats whom and the path that energy takes.

Scoring tip: Arrows must point from the food to the eater. Write T1, T2, T3 and T4 under the organisms.