NCERT Class VIII Science Solutions: Chapter 1-Crop Production and Management Part 3

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Question 6:

What is irrigation? Describe two methods of irrigation which conserve water.

Answer:

The supply of water to crops at different intervals is called irrigation. The two methods of irrigation which conserve water are as follows:

  1. Sprinkler System:

  2. Under this method, the perpendicular pipes, having rotating nozzles on top, are joined to the main pipeline at regular intervals. When water is allowed to flow through the main pipe under pressure with the help of a pump, it escapes from the rotating nozzles. It gets sprinkled on the crop as if it is raining.

As showing in images is a result for Sprinkler System

Result for Sprinkler System

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  1. Drip system:

  2. In this system, the water falls drop by drop just at the position of the roots. It is the best technique for watering fruit plants, gardens and trees. Water is not wasted at all. It is a boon in regions where availability of water is poor.

As showing in images is a Drip system

Drip System

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Question 7:

If wheat is sown in the Khari season, what would happen? Discuss.

Answer:

Wheat is a rabi crop, hence it requires cold climatic conditions to be grown properly. If it is sown in the kharif season, it will not grow or may get destroyed due to excessive rains in the kharif season.

As showing in images is a sown in the Khari season

Sown in the Khari Season

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Question 8:

Explain how soil gets affected by the continuous plantation of crops in a field.

Answer:

Soil supplies mineral nutrients to the crop. These nutrients are essential for the growth of plants. Continuous growing of crops in the same field makes the soil poorer in certain nutrients. This makes the soil infertile. And then, to replenish the soil with nutrients farmers need to add manures to the soil.

As showing in images is a soil gets affected by the continuo …

Soil Gets Affected by the Continuous Plantation

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