UPSC PRE 2020 Environment Answer Keys - Explanation

With reference to India’s Desert National Park,which of the following statements are correct? 1. It is spread over two districts. 2. There is no human habitation inside the Park. 3. It is one of the natural habitats of Great Indian Bustard. Select the correct answer using the code given below: (a) 1 and 2 only (b) 2 and 3 only (c) 1 and 3 only (d) 1,2 and 3

There are 73 villages and also settlements or Dhanis existing within the Park. These communities have inhabited this area for hundreds of years and with their rich culture and tradition they are an integral part of this ecosystem.

Siachen Glacier is situated to the (a) East of Aksai Chin (b) East of Leh (c)North of Gilgit (d) North of Nubra Valley

Consider the following statements:

1. 36% of India’s districts are classified as “overexploited” or “critical”by the Central Ground Water Authority(CGWA).

2. CGWA was formed under the Environment (Protection) Act.

3. India has the largest area under groundwater irrigation in the world.

Which of the statements given above is/are correct ?

(a) 1 only

(b) 2 and 3 only

(c) 2 only

(d) 1 and 3 only

Among the following Tiger Reserves,which one has the largest area under “Critical Tiger Habitat” ?

(a) Corbett

(b) Ranthambore

(c) Nagarjunasagar- Srisailam

(d) Sunderbans

If a particular plant species is placed under Schedule VI of the Wildlife Protection Act,1972, what is the implication?

(a) A licence is required to cultivate that plant.

(b) Such a plant cannot be cultivated under any circumstances.

(c) It is a Genetically Modified crop plant.

(d) Such a plant is invasive and harmful to the ecosystem.

What is/are the advantage/advantages of zero tillage in agriculture ?

1. Sowing of wheat is possible without burning the residue of the previous crop.

2. Without the need for nursery of rice saplings, direct planting of paddy seeds in the wet soil is possible.

3. Carbon sequestration in the soil is possible.

Select the correct answer using the code given below:

(a) 1 and 2 only

(b) 2 and 3 only

(c) 3 only

(d) 1,2 and 3 only

Which one of the following statements best describes the term ‘Social Cost of Carbon’?

It is a measure,in monetary value, of the

(a) long-term damage done by a tonne of CO2 emissions in a given year.

(b) requirement of fossil fuels for a country to provide goods and services to its citizens, based on the burning of those fuels.

(c)efforts put in by a climate refugee to adapt to live in a new place.

(d) contribution of an individual person to the carbon footprint on the planet Earth.

In the context of India,which of the following is/are considered to be practice(s) of eco-friendly agriculture?

1. Crop diversification

2. Legume intensification

3. Tensiometer use

4. Vertical farming

Which of the statements given above is/are correct ?

(a) 1,2 and 3 only

(b) 3 only

(c)4 only

(d) 1,2,3 and 4

In India,why are some nuclear reactors kept under “IAEA Safeguards” while others are not?

(a) Some use Uranium and others use thorium.

(b) Some use imported uranium and others use domestic supplies.

(c) Some are operated by foreign enterprises and others are operated by domestic enterprises.

(d) Some are State- owned and others are privately-owned.

With reference to Indian Elephants, consider the following statements :

1. The leader of an elephant group is a female.

2. The maximum gestation period can be 22 months.

3. An elephant can normally go on calving till the age of 40 years only.

4. Among the States in India,the highest population is in kerala.

Which of the statements given above is/are correct ?

(a) 1and 2 only

(b) 2 and 4 only

(c) 3 only

(d) 1,3 and 4 only.

Which of the following Protected areas are located in Cauvery basin? 1. Nagarhole National Park. 2. Papikonda National Park. 3. Sathyamangalam Tiger Reserve 4. Wayanad Wildlife Sanctuary Select the correct answer using the code given below: (a) 1 and 2 only (b) 3 and 4 only (c) 1, 3 and 4 only (d) 1,2,3 and 4

Papikonda National Park- Godavari Basin

With reference to India’s Biodiversity,Ceylon frogmouth, Coppersmith barbet, Gray-chinned minivet and White-throated redstart are

(a) Birds

(b) Primates

(c) Reptiles

(d) Amphibians

Which one of the following protected areas is well known for the conservation of a sub-species of the Indian swamp deer(Barasingha) that thrives well on hard ground and is exclusively graminivorous?

(a) Kanha National Park

(b) Manas National Park

(c) Mudumalai Wildlife Sanctuary

(d) Tal Chhapar Wildlife Sanctuary

Which of the following are the most likely places to find the musk deer in its natural habitat?

  1. Askot Wildlife Sanctuary

  2. Gangotri national Park

  3. Kishanpur Wildlife Sanctuary

  4. Manas national Park

Select the correct answer using the given code below

(a) 1 and 2 only

(b) 2 and 3 only

(c) 3 and 4 only 

(d) 1 and 4 only

Consider the following statements

  1. Coal ash contains arsenic, lead and mercury.

  2. Coal fired power plants release sulphur dioxide and oxides of nitrogen into the environment.

  3. High ash content is observed in Indian Coal.

 Which of the above given statements is/are correct?

(a) 1 only

(b) 2 and 3 only

(c) 3 only

(d) 1, 2 and 3

Consider the following statements:

1. Jet Streams occur in the Northern Hemisphere only.

2. Only some cyclones develop an eye.

3. The temperature inside the eye of a cyclone is nearly 10 degree Celsius lesser than that of the surroundings.

Which of the statements given above is/are correct ?

(a) 1 only

(b) 2 and 3 only

(c) 2 only

(d) 1 and 3 only

The crop is subtropical in nature. A hard frost is injurious to it. It requires at least 210 frost -free days and 50 to 100 centimeters of rainfall for its growth. A light well-drained soil capable of retaining moisture is ideally suited for the cultivation of the crop.” Which one of the following is that crop? (a) Cotton (b) Jute (c)Sugarcane (d) Tea

Cotton is grown between latitudes of 37° north and 30° south in temperate, subtropical and tropical regions and on every continent.

Ideal conditions for the cotton plant are:

  • Long vegetation periods (175 to 225 days) without frost. 

  • Constant temperatures between 18 and 30°. 

  • Ample sunshine and fairly dry conditions. 

  • A minimum of 500 mm of water between germination and boll formation. 

  • Deep, well-drained soils with a good nutrient content.

Consider the following pairs: River            Flows into 1. Mekong – Andaman Sea 2. Thames – Irish Sea 3. Volga – Caspian Sea 4. Zambezi – Indian Ocean Which of the statements given above is/are correct ? (a) 1 and 2 only (b) 3 only (c) 3 and 4 only (d) 1,2 and 4 only

Mekong river flows into South China sea.

Thames flow into North sea.

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