What is chlorosis?

What is the importance of measuring BOD of a water body?

Name any four methods for waste management.

Name three natural sources of air pollution.

What is the role of CO₂ in the 'greenhouse' effect'?

What are viable and non-viable particulates?

Which main compounds are causing damage to the ozone layer?

Dissolved oxygen in water is very important for aquatic life. What processes are responsible for the reduction of dissolved oxygen in water?

What do you mean by biochemical oxygen demand (BOD)?

How can domestic waste be used as manure?

Ozone is a toxic gas and is a strong oxidising agent even then its presence in the stratosphere is very important. Explain what would happen if ozone from this region is completely removed?

How is ozone produced in the stratosphere?

What are pesticides and herbicides? Explain giving examples.

How is the temperature effected as we go up the earth's surface? Explain

What do you mean by ozone hole? What are its consequences?

Dr Jain's family has four cars and they use all of them everyday creating lot of pollution whereas Mr. Lalit Jain despite having two cars, takes metro or other means of public transport to reach his place of work.
(i) What kind of polluting gases are emitted by motor vehicles?
(ii) How can we decrease carbon monoxide gas in the atmosphere?
(iii) What values are possessed by Mr. Lalit Jain?

Water is essential for life and we cannot imagine our life without it. Municipal and Industrial discharge lead to water pollution. Organic wastes also create water pollution. Heavy metals from industries create lot of water pollution.
Immersion of a statues of during festivals, create lot of water pollution.
The residents of Chitranjan Park decided no to put Durga statue into Yamuna river like every year. This step was highly appreciated by Delhi Govternment, and the NGO 'Save Yamuna Project'.
(i) What should be done to reduce water pollution? Give three ways.
(ii) What is the effect of water pollution?
(iii) What is the threat for aquatic animals due to water pollution?
(iv) What values are possessed by the residents of Chitranjan Park?

What are the harmful effects of photochemical smog and how can they be controlled?

Some time ago formation of polar stratospheric clouds was reported over Antarctica. Why were these formed? What happens when such clouds break up by the warmth of sunlight?

How can you apply green chemistry for the following?
(i) To control photochemical smog
(ii) To avoid use of halogenated solvents in dry
(iii) To reduce use of synthetic detergents
(iv) To reduce the consumption of petrol and diesel