The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about (in $\%$)

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

Why are crop fields known as artificial ecosystems?

Define ecosystem.

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

Write two characteristic features of energy flow in an ecosystem.