Which of the following soil is most suited for tea plantation?
Correct Answer:
(A)
Acidic
Tea is grown in a variety of soils. The best, however, is soil slightly acidic and without calcium as tea is highly intolerant to stagnant water. Although tea requires heavy rainfall for its growth, stagnant water is injurious to its roots. It is, therefore, grown on hill slopes where water drains away easily and water-logging does not take place. However, it grows equally well in the valley if the drainage system is good.
Ques:
12
Soils of western Rajasthan have a high content of:
Correct Answer:
(B)
Calcium
The districts of Jaisalmer, Bikaner, Barmer, Jalore, Jodhpur, Ganganagar, Sirohi, Jhunjhunu, Pali and Sikar of western Rajasthan have alkaline and saline soils with a calcareous base. There is some nitrate concentration in the soil of these regions. Hence, soils of western Rajasthan have a high content of calcium.
Ques:
13
Karewas soils, which are useful for the cultivation of Zafran (a local variety of saffron), are found
Correct Answer:
(A)
Kashmir Himalaya
Karewa soil is found in the Kashmir Valley and is used for growing local saffron called Zafran.
Ques:
14
Following are the statements regarding the Usar soil:
It is reclaimed by adding lime.
This soil has pH more than seven.
Paddy crop can be grown in this soil.
Select the correct answer from the codes given below:
Codes:
Correct Answer:
(B)
2 and 3 are correct
Usar soil has more pH than 7. There is a severe deficiency of bacteria, nitrogen and zinc in this soil. Pyrites, gypsum and green manure are used for its treatment. This type of land is suitable for cultivation of tolerant paddy varieties like Narendra Shankar Usar Paddy-1, Usar Paddy-2 etc. The use of lime is used in the treatment of acidic soil instead of the treatment of the Usar Soil. So, option (b) is the correct answer.
Ques:
15
In which one of the following areas in India, the problem of soil erosion is critical?
Correct Answer:
(B)
Foothill areas of Shivalik ranges
The maximum soil erosion affected areas in India are given below:
Barren land of Chambal and Yamuna rivers
Foothill areas of Western Himalayan Ranges (including foot hill areas of the Shiwalik Ranges)
Chotanagpur Plateau
The area between Tapti and Sabarmati Valley (Malwa Plateau etc)
Black soil area of Maharashtra
Arid regions of Haryana, Rajasthan & Gujarat.
Ques:
16
Which among the following districts of Madhya Pradesh has a problem of soil erosion -
Correct Answer:
(C)
Morena
In Madhya Pradesh, the problem of soil erosion is mostly found in Chambal valley where channel formation is very common and known as Chambal ravines. Soil contents are characterized by soft and alluvial soil, which help in the formation of these channels. Mainly Morena, Bhind, Gwalior and Shivpuri have become barren and infertile due to gully erosion by various rivers.
Ques:
17
Which one of the following types of erosion is responsible for the formation of Chambal Ravines?
Correct Answer:
(D)
Gully
After viewing the map of soil erosion in India, it is clear that Gully Erosion is responsible for the formation of Chambal Ravines.
Ques:
18
Identify the correct order of the process of soil-erosion form the following:
Correct Answer:
(A)
Splash erosion, Sheet erosion, Rill erosion, Gully erosion
The correct order of the process of soil erosion is given below:
i. Raindrop or Splash erosion: Erosion preceded by the destruction of the crumb structure due to the impact of falling raindrop on the surface of the soil is termed as splash erosion.
Sheet erosion: It is the fairly uniform removal of soil in thin layers from the land surface, often scarcely perceptible, especially when caused by wind. Areas where loose, shallow topsoil overlies compact soil are most susceptible to sheet erosion.
Rill erosion: A form of water erosion in which numerous very small and more or less, straight channels are produced; the channels get obliterated by ordinary use. It can be removed by normal tillage operations.
Gully erosion: A form of water erosion in which gullies are produced by a combination of unattended rills.
Stream Channel erosion: Stream banks are eroded by water either flowing over the sides of a stream or scouring at the base. It is aggravated by removal of vegetation, overgrazing or cultivation near the stream banks.
Ques:
19
The rotation of crops is essential for –
Correct Answer:
(C)
Increasing soil fertility
Crop rotation refers to the practice of growing different types of crops over the same area in different seasons. This is because the same type of crop planted repeatedly over the same area keeps draining the same nutrients of the land needed for that plant’s growth. Crop rotation not only enriches soil fertility but also helps in pest control.
Ques:
20
In India, the problem of soil erosion is associated with which of the following?
Terrace cultivation
Deforestation
Tropical climate
Select the correct answer using the code given below.
Correct Answer:
(B)
2 only
The destruction of soil cover is described as soil erosion. The soil forming processes and the erosional processes of running water and wind go on simultaneously. But generally, there is a balance between these two processes. Sometimes, such a balance is disturbed by natural or human factors, leading to a greater rate of removal of soil.
Deforestation is one of the major cause of soil erosion. Plants keep soils bound in locks of roots, and thus, prevents erosion. Terrace farming is a method of soil conservation. The tropical climate is not responsible for soil erosion.