Nitrogen Fixation

Q. Briefly explain Nitrogen fixation and Nitrogen assimilation.

Q.

How is atmospheric nitrogen converted to nitrates?

Q. What name is given to bacteria found in the root nodules of pea plant? State their importance.

Q. Growing two or more crops in definite row patterns is known as ___________.

1. mixed cropping
2. inter-cropping
3. crop rotation
4. organic farming

Q.

Name the process of conversion of free atmospheric nitrogen into usable compounds.

Q. The nitrogen cycle involves bacteria capable of changing proteins to ammonia. These bacteria are called as________________

1. Bacteria of decay
2. Denitrifying bacteria
3. Nitrifying bacteria
4. Ammonifying bacteria

Q. Fill in the blanks:
10) Growing two or more crops but in definite row pattern is known as

Q.

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

1. A biological process of nitrogen-fixing bacteria present in the soil

2. A biological process of carbon fixing factor present in soil

3. Any of the industries manufacturing nitrogenous compounds

4. The plants used as cereal crops in field

Q.

Which of the following is a benefit of microbial fertilisers?

1. Increase in the soil pH.

2. Increased nutrient content in soil.

3. Increase in the growth of weeds.

4. Increased pests and insects.

Q. Plants use nitrogen in the form of:

1. Nitric oxides
2. Nitrous oxides
3. Nitrides
4. Nitrates

Q. Why plants cannot absorb molecular nitrogen from the atmosphere?

1. Nitrogen is toxic
2. Nitrogen is highly reactive
3. Nitrogen is highly stable
4. Abundance in the atmosphere inhibits absorption

Q. How much drinking water is required daily for a cow?

Q. Briefly explain Nitrogen fixation and Nitrogen assimilation.

Q. What are the following organisms called?
a) Algae that prepare their own food.
b) Fungi that either depend on living organisms or non-living things for their food.
c) An organism having both algal and fungal characters.