Pond is a self-sustainable unit. Some organisms related to pond ecosystem are listend below
tadpole, fish, water plants, kingfisher
a. Construct a food chain with the listed organisms.
b. Explain trophic level.
c. Point out trophic level of each organism in the constructed food chain.
d. Name interconnection of food chains in nature.

Explanation

a. Water plants `to` tadpole `to` fish `to` kingfisher
b. Based on the source of their nutrition or food, organisms occupy a specific place in the food chain, that is known as their trophic level.
c. Water plants - I trophic level - producers
Tadpole - II trophic level - herbivores (primary consumer)
Fish - III trophic level - secondary consumer
Kingfisher - IV trophic level - tertiary consumer
d. Food web.