Biotic component of biosphere is not constituted by:

Name two diseases caused by regularly breathing in polluted air.

The nitrogen molecules present in air can be converted into nitrates and nitrites by:

The major source of minerals in the soil is the

$(a)$ Differentiate between biodegradable and non-biodegradable substances.
$(b)$ How is acid rain causing harm to the 'Taj Mahal'?
$(c)$ What is smog?

State whether the following statement is true or false:
Oxygen is returned to the atmosphere in only one major process,that is,respiration.