Skip to content
GK24
Prime
GeographyMediumAsked in: RRB Group D · 16 Sept 2022, Shift 2

Which of the following methods prevents or reduces wind erosion of soil in open areas?

  1. A.Covering up open areas with tiles or cement
  2. B.Following crop rotation in agriculture
  3. C.Using trees or large shrubs as fences for a garden
  4. D.Using pots to grow vegetables at home

Correct answer

C. Using trees or large shrubs as fences for a garden

Explanation

The correct answer is C, Using trees or large shrubs as fences for a garden. A line of trees or tall shrubs works as a windbreak: it slows the wind close to the ground so the moving air can no longer lift loose soil.

Wind erosion happens on dry, bare, open land where the topsoil is loose and there is no cover to hold it. Rows of trees planted across the direction of the wind are called shelterbelts, and they are the standard remedy in dry regions such as western Rajasthan, where they were planted along the Indira Gandhi Canal. The roots of the trees also bind the soil and their fallen leaves add humus to it.

Option A is wrong because paving land with tiles or cement seals the soil and destroys its use for plants; it is not soil conservation. Option B is wrong because crop rotation restores soil fertility rather than blocking the wind. Option D is wrong because growing vegetables in pots at home does nothing for open land.

Exam tip: shelterbelts and windbreaks check wind erosion; contour ploughing and terracing check water erosion.

Practice Questions

View all
Q2.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following statements is/are correct? 1. Himalayan rivers have their origin in the snow-covered areas, hence are dry in winter season. 2. Rivers of the Peninsular Plateau have reached maturity. 3. Himalayan rivers depict all the three stages of normal cycle of erosion. Select the correct answer using the code given below.

  1. A.2 only
  2. B.1 and 3 only
  3. C.2 and 3 only
  4. D.1, 2 and 3
Show answer
Correct answer: C. 2 and 3 only

Himalayan rivers are perennial, so statement 1 is wrong, while statements 2 and 3 are correct. Himalayan rivers such as the Ganga, Indus and Brahmaputra rise from glaciers and snowfields and also get monsoon rain, so they flow all year round, including in winter.

Q3.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following statements related to latitude are true? 1. Rainfall, temperature and vegetation vary with latitude. 2. The difference between the longest day and the shortest day increases with latitude. 3. Indira Point is located approximately at 6°45' N latitude. Select the correct answer using the code given below.

  1. A.1 and 2 only
  2. B.1 and 3 only
  3. C.2 and 3 only
  4. D.1, 2 and 3
Show answer
Correct answer: D. 1, 2 and 3

All three statements about latitude are true. Latitude decides how directly the Sun's rays strike a place, so temperature, rainfall and the type of vegetation change from the equator towards the poles, from hot, wet rainforests to cold tundra.

Q4.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following lakes is/are situated in Ladakh? 1. Tso Kar 2. Pangong Tso 3. Tsomgo 4. Tso Moriri Select the correct answer using the code given below.

  1. A.1 only
  2. B.2 and 3
  3. C.1, 2 and 4
  4. D.2 and 4 only
Show answer
Correct answer: C. 1, 2 and 4

Tso Kar, Pangong Tso and Tso Moriri are high-altitude lakes of Ladakh, while Tsomgo lies in Sikkim. Pangong Tso, at about 4,350 metres, is a long, narrow lake that stretches from Ladakh into Tibet, and most of its length lies on the Chinese side.