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71
The transfer of minerals from top soil to subsoil through soil water is called ________
Discuss
Answer & Solution
Answer: Option C
Solution:
Leaching is the process by which the loss (or) extraction of essential material (like micro & macro nutrients) of soil occurs. It may be done through water, wind (or) other agents.
72
Why is crop rotation necessary?
Discuss
Answer & Solution
Answer: Option A
Solution:
Soil contains many minerals and salts. Some of them are used by one type of crop while others by other crops. Crop rotation will help to regain those minerals and will prevent the over exploitation of one type of mineral.
73
The important feature of shifting cultivation is ________
Discuss
Answer & Solution
Answer: Option C
Solution:
The important feature of shifting cultivation is Change of cultivation site. Shifting cultivation is an agricultural system in which a person uses a piece of land, only to abandon or alter the initial use a short time later. This system often involves clearing of a piece of land followed by several years of wood harvesting or farming until the soil loses fertility.
74
Black soils are ideal for cultivation of cotton as
Discuss
Answer & Solution
Answer: Option B
Solution:
Black soils are ideal for cultivation of cotton as they can retain moisture. Cotton cultivation requires high moisture retention. Black soils are very fine grained and dark, contain a high proportion of calcium and magnesium carbonates and highly argillaceous.
75
Choose the crops which were cropped by using high yielding seeds in India during Green Revolution?
Discuss
Answer & Solution
Answer: Option C
Solution:
In 1966 during the time of green revolution yielding variety seeds of wheat, rice, maize, jowar, millet were sown. It was most successful with fodder crops specially wheat and rice.
76
Which of the following is a cash crop in India?
Discuss
Answer & Solution
Answer: Option B
Solution:
Gram is a cash crop in India. A cash crop or profit crop is an agricultural crop which is grown to sell for profit.
77
Green Revolution is related to which Crop
Discuss
Answer & Solution
Answer: Option B
Solution:
In "Green Revolution" new varieties of dwarf wheat such as Lerma, Roso and Sonora were imported and the yield was increased by 562% i.e. nearly 6 times. Although there were other crops like rice and millet but main thrust was with wheat.
78
Consider the following statements:
1. Alluvial soil is rich in chemical properties and is capable of yielding Rabi and Kharif crops.
2. Black soil is suitable for cotton, groundnut.
3. Rabi crops are reaped in autumn after sowing in June.
Which of these statements are correct ?
Discuss
Answer & Solution
Answer: Option B
Solution:
The statements that are correct are that Alluvial soil is rich in chemical properties and is capable of yielding Rabi and Kharif crops and Black soil is suitable for cotton, groundnut.
79
Soil can best be conserved on the hills by which of the cultivating methods?
Discuss
Answer & Solution
Answer: Option C
Solution:
Soil can best be conserved on the hills by Contour ploughing. If ploughing is done at right angles to the hill slope, the ridges and furrows break the flow of water down the hill. This prevents excessive soil loss as gullies are less likely to develop and also reduce run-off so that plants receive more water.
80
Which is the best suited soil for the cultivation of rice?
Discuss
Answer & Solution
Answer: Option C
Solution:
Rice is a kharif crop which requires highly alluvial soil and a great amount of water. Major rice producing states are Andhra Pradesh, West Bengal and Uttar Pradesh.