Although coal and petroleum are produced by the degradation of biomass,we still need to conserve them. Why?

The forest cover in the world is decreasing rapidly. What is the main reason for this?

Why should biodegradable and non-biodegradable wastes be discarded in two separate dustbins?

List any four methods of conserving fossil fuels.

Given below are a few statements related to biodiversity. Pick those that correctly describe the concept of biodiversity.
$(i)$ Biodiversity refers to the different species of flora and fauna present in an area.
$(ii)$ Biodiversity refers to only the flora of a given area.
$(iii)$ Biodiversity is greater in a forest.
$(iv)$ Biodiversity refers to the total number of individuals of a particular species living in an area.

Select the incorrect statement.