Crop Rotation

Q. Question 17
Beera, wants to practice crop rotation in his field. Suggest a Rabi crop and a Kharif crop which will replenish his field with nitrogen. Which crop replenishes nitrogen and why?

Q.

List few advantages of crop rotation.

Q. How crop rotation help in replenishment of the soil?

Q.

Farmers in Northern India grow legumes as fodder in one season and wheat in the next season.

(a) What is this practice known as ?

(b) How does this practice help in the replenishment of soil ?

Q.

State one advantage of growing a leguminous crop between two cereal crops.

Q.

Definition of agricultural year is?

Q.

Monoculture are bad for soil health why

Q. Why do farmers cultivate plants of pea family

Q.

Leguminous plants improve soil fertility. How?

Q.

Why is cyanobacteria so important?

Q.

The Rhizobium bacteria present in the root nodules of pea plants can fix one of the following from the atmosphere. This one is :

(a) hydrogen (b) oxygen (c) nitrogen (d) halogen

Q.

What is meant by crop rotation? Which crop is mainly used for the rotation?

Q.

10-15 short answer questions alone..chapter, crop production and management.....

Q. Question 20
From the word puzzle given as the following figure find atleast eight words which are ‘farmer’s friends.’ Classify them into living and non living.

Q.

Give one example of two year rotation.

Q.

What would happen without nitrogen fixing bacteria?

Q.

The figure given below shows a part of nitrogen cycle.

Which of the following represents the nitrates?

1. X

2. Y

3. Z

4. All of these

Q.

What are the oxygen scavengers found in nodules called which protect enzymes?

Q.

Soil fertility is reduced by

1. intensive farming

2. crop rotation

3. nitrogen fixing bacteria

4. decaying organic matter

Q.

What would happen if denitrification stopped?

Q.

Plants cannot absorb nitrogen in the gaseous form.

1. True

2. False

Q. In crop rotation , does soil fertility decrease only when cereal crops are grown?

Q. Define the Nitrogen cycle? [1MARK]

Q.

Which of the following crops would enrich the soil with nitrogen ?

(a) apple (b) pea (c) paddy (d) potato

Q. Crop rotation is the year round cultivation of a single crop.

1. False
2. True

Q. Fill in the following blanks with suitable words.

(g) As a result of the nitrogen cycle, the percentage of nitrogen in the atmosphere remains more or less

Q. Choose the correct definition for “Rhizobium bacteria”.

1. The bacteria found in the intestines of animals which help in the digestion of cellulose present in their feed
2. Bacteria which are used in sewage works to break down the organic matter in sewage and make it harmless
3. The nitrogen-fixing bacteria present in root nodules of leguminous plants which convert atmospheric nitrogen gas into nitrogen compound
4. Bacteria that makes curd from milk

Q. Why do farmers plant leguminous crops in crop rotations/mixed cropping?

Q. The figure given below shows a part of nitrogen cycle.

Which of the following represents nitrates?

1. X
2. Y
3. Z
4. All of these

Q. List the steps involved in the nitrogen cycle.