In which form do the plants store the trapped solar energy?

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.

Name the group of chemical compound which adversely affects the ozone layer.

Pesticides added to the field is seen in increased amounts in the crop and in the birds that feed on them. What is the phenomenon called?

Why is a lake considered to be a natural ecosystem?