The ozone molecule absorbs ultraviolet $(UV)$ radiation of which wavelength range?

Excessive exposure of humans to $UV$-rays results in:
$(i)$ Damage to immune system
$(ii)$ Damage to lungs
$(iii)$ Skin cancer
$(iv)$ Peptic ulcers

State the direction of flow of energy in a food chain. Can food and energy from a trophic level move back to the previous level? Give reasons for your answer.

How many molecules of ozone can be decomposed by one atom of chlorine?

Where is the ozone layer located?

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.