Question

G. Answer in following questions in detail.
1. How would you prepare your field
before sowing seeds?
2. Compare the benefits and disadvantages
of using manure and fertilisers in the crop field.
3. Discuss the various methods that can be employed for the control of weeds.
4. Write a note on 'Improvement of Crops'.
5. What could be the consequences of not fumigating and drying of the granaries?
Give reason: Plantation of the same
crop in a field over and over should be avoided.
7. Why is it essential to irrigate our fields?
8. With the help of a diagram only, explain nitrogen cycle.


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Answer 1

1. Preparation of soil involves ploughing and lavelling it. Ploughing involves loosening and turning of soil using a tool or an implement called the plough made up of wood or iron.
2. Manure adds nutrients to the soil without affecting its fertility. It does not damage the crops and produces healthy plants. Fertilizers are chemicals which lower the fertility of the soil if used regularly.
3. Weed control is important in agriculture. Methods include hand cultivation with hoes, powered cultivation with cultivators, smothering with mulch, lethal wilting with high heat, burning, and chemical control with herbicides (weed killers).
4. Crop improvement refers to the genetic alteration of plants to satisfy human needs. ... Through a long history of trial and error, a relatively few plant species have become the mainstay of agriculture and thus the world's food supply. Answer: it is given.
5. The consequences of not fumigating and drying the granaries would lead to the growth of various pests and the whole crop would get damaged and cause huge loss to the crop.
6. The continuous plantation of same crop in a field should be avoided because this will result in the deficiency of nutrients in soil.
7. Irrigation is essential for our field as it "helps to grow" agricultural crops. A good crop growth always needs different minerals and fertilizers which are absorbed by plants in their soluble state. This absorption can only be done with the help of water.
8. The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes.

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