Sign up now
to enroll in courses, follow best educators, interact with the community and track your progress.
Download
Part 21 CSAT Q8-Q10
8 plays

More
UPSC CSE PRELIMS 2018 PART 21 CSAT

AAKRITI
Graduate in Biology Completed M.Sc. in Zoology Power is gained by sharing knowledge not hoarding it.

U
Unacademy user
  1. UPSC CSE 2018 PRELIMS CSAT AS EXAM PART-3 Indian Administrative ServicesBY: AAKRITI


  2. Passage 4 'Desertification' is a term used to explain a process of decline in the biological productivity of an ecosystem, leading to total loss of productivity. While this phenomenon is often linked to the arid, semi-arid and sub-humid ecosystems, even in the humid tropics, the impact could be most dramatic. Impoverishment of human-impacted terrestrial ecosystems may exhibit itself in a variety of ways accelerated erosion as in the mountain regions of the country, salinization of land as in the semi-arid and arid green revolution' areas of the country, e.g., Haryana and western Uttar Pradesh, and site quality decline-a common phenomenon due to general decline in tree cover and monotonous monoculture of rice/wheat across the Indian plains. A major consequence of deforestation is that it relates to adverse alterations in the hydrology and related soil and nutrient losses. The consequences of deforestation invariably arise out of site degradation through erosive losses


  3. Tropical Asia, Africa and South America have the highest levels of erosion. The already high rates for the tropics are increasing at an alarming rate (e.g., through the major river systems-Ganga and Brahmaputra, in the Indian context), due to deforestation and ill-suited land management practices subsequent to forest clearing. In the mountain context, the declining moisture retention of the mountain soils, drying up of the underground springs and smaller rivers in the Himalayarn region could be attributed to drastic changes in the forest cover An indirect consequence is drastic alteration in the upland- lowland interaction, mediated through water. The current concern the tea planter of Assam has is about the damage to tea plantations due to frequent inundation along the flood- plains of Brahmaputra, and the damage to tea plantation and the consequent loss in tea productivity is due to rising level of the river bottom because of siltation and the changing course of the river system. The ultimate consequences of site desertification are soil degradation, alteration in available water and its quality, and the consequent decline in food, fodder and fuel-wood yields essential for the economic well- being of rural communities.


  4. 8. According to the passage, which of the following are the consequences of decline in forest cover? 1. Loss of topsoil 2. Loss of smaller rivers 3. Adverse effect on agricultural production 4. Declining of groundwater Select the correct answer using the code given below. (a) 1, 2 and 3 only (b) 2, 3 and 4 only (c) 1 and 4 only (d) 1, 2, 3 and 4


  5. Answer.;a


  6. 9. Which of the following is/are the correct inference/ inferences that can be made from the passage? 1. Deforestation can cause changes in the course of rivers. 2. Salinization of land takes place due to human activities only. 3. Intense monoculture practice in plains is a major reason for desertification in Tropical Asia, Africa and South America. Select the correct answer using the code given below. (a) 1 only (b) 1 and 2 only (c) 2 and 3 only (d) None of the above is a correct inference


  7. Answer. (c


  8. 10. With reference to 'desertification', as described in the passage, the following assumptions have beern made 1. Desertification is a phenomenon in tropicalareas only. 2. Deforestation invariably leads to floods and desertification. Which of the above assumptions is/are valid? (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2


  9. Answer. b