Given below is a list of autotrophs and heterotrophs. With your knowledge about food chain, establish various linkages between the organisms on the principle of ‘eating and being eaten’. What is this inter-linkage established known as ?

Algae, hydrilla, grasshopper, rat, squirrel, crow, maize plant, deer, rabbit, lizard, wolf, snake, peacock, phytoplankton, crustaceans, whale, tiger, lion, sparrow, duck, crane, cockroach, spider, toad, fish, leopard, elephant, goat, nymphae, spirogyra.

The natural inter connection of food chain containing producers, consumers and decomposers in cross ( $x$ ) shape form combinedly is called food web.

$(i)$ Highlevel carnivores - Tiger, Lion (Higher trophic level).

$(ii)$ Spider, cockroach, lizard, wolf, snake, toad, fish, crane - Secondary consumers. (Third trophic level)

$(iii)$ Crustaceans, grasshopper, deer, mouse, squirrel (Second trophic level).

$(iv)$ Rabbit, elephant - goat, primary consumers (Second trophic level).

$(v)$ Phytoplankton, algae, hydrila maize plant, nimphia, spirogyra - Producers (first trophic level).