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1.
2.
The process of nitrogen fixation by bacteria does not take place in the presence of:
3.
Top soil is the best for the vegetation. The main components ofthis productive top layer are:
4.
If the carbon dioxide content in the atmosphere is increased then which one of the following would not get affected?
5.
The nitrogen molecules present in air can be converted into nitrates by:
6.
A cool breeze after a hot day brings all of us considerable relief. This breeze is actually the moving air. What is the basic process that causes this movement of air?
7.
Presence of the fertilizers and sewage in polluted water provides a lot of nitrogen, causing excessive growth of algae which subsequently reduces the amount of dissolved oxygen in water.Can you name this process of reduction of dissolved oxygen due to the excess growth of algae.
8.
Ozone layer is a protective blanket in the atmosphere that protectsus from the harmful high energy UV radiations coming from the sun. But it has been observed that some harmful air pollutants like chlorofluorocarbons are causing hole in this protective layer. What does this 'ozone hole' exactly mean?
9.
Aquatic organisms are used to a certain range of temperature in the water bodies where they live. A sudden marked change in this temperature can affect:
i. Breeding of animals
ii. Growth of the aquatic plants
iii. Process of digestion in animals
iv. Availability of nutrients
Choose the correct option from the following:
i. Breeding of animals
ii. Growth of the aquatic plants
iii. Process of digestion in animals
iv. Availability of nutrients
Choose the correct option from the following:
10.
