Harmful chemicals enter into our body through biological magnification.

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

What is meant by 'non-biodegradable' waste? Identify biodegradable waste from the following:
Empty packet of chips,empty plastic bottle of mineral water,empty paper box of sweets,empty tin of a cold drink.

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

In the given food chain,suppose the amount of energy at the fourth trophic level is $5 \, kJ$,what will be the energy available at the producer level? (in $kJ$)
Grass $\rightarrow$ Grasshopper $\rightarrow$ Frog $\rightarrow$ Snake $\rightarrow$ Hawk

$(i)$ What is the height of the ozone layer from the equator?
$(ii)$ Name the rays against which the ozone layer provides protection.
$(iii)$ Name one effect of the depletion of the ozone layer.