Write any two consequences if decomposers are removed from the ecosystem.

In a food chain,the third trophic level is always occupied by

Distinguish between biodegradable and non-biodegradable substances. List two effects of each of them on our environment.

If a grasshopper is eaten by a frog,then the energy transfer will be from

Select the mismatched pair in the following and correct it.
$(a)$ Biomagnification — Accumulation of chemicals at the successive trophic levels of a food chain
$(b)$ Ecosystem — Biotic components of environment
$(c)$ Aquarium — $A$ man-made ecosystem
$(d)$ Parasites — Organisms which obtain food from other living organisms

Which one of the following is an artificial ecosystem?