Que 11 – Human activities in the recent past have caused the increased concentration of carbon dioxide in the atmosphere, but a lot of it does not remain in the lower atmosphere because of : (UPSC CSE 2011)

1. It escape into the outer stratosphere.

2. The photosynthesis by phytoplankton in the oceans.

3. The trapping of air in the polar ice cap.

Which of the following statement is is/are correct ?

(a) 1 and 2

(b) 2 only

(c) 2 and 3

(d) 3 only

Answer – (c)

Explanation :
CO2 cycle shows the way in which it is circulated in the atmosphere.
It does not escape to stratosphere but is circulated between the organism, oceans, and the atmosphere.

Que 12 – In the context of ecosystem productivity, in Marine upwelling zones are important as they increase the Marine productivity by bringing the : (UPSC CSE 2011)

1. Decomposer microorganism to the surface.

2. Nutrients to the surface.

3. Bottom-dwelling organisms to the surface.

Which of the following statement given below is/are correct?

(a) 1 and 2

(b) 2 only

(c) 2 and 3

(d) 3 only

Answer – (b)

Explanation :
Marine upwelling zones are the areas where the cold water rich in nutrients replace the warmer water.
The surface waters often have high biological productivity.
Therefore, good fishing grounds typically are found where upwelling is common.

Que 13 – With reference to India, consider the following Central Acts :(UPSC CSE 2011)

1. Import and Export (Control) Act, 1947

2. Mining and Mineral Development (Regulation) Act, 1957

3. Customs Act, 1962

4. Indian Forest Act, 1927

Which of the above Acts have relevant to/bearing on the biodiversity conservation in the country?

(a) 1 and 3 only

(b) 2, 3 and 4 only

(c) 1, 2, 3 and 4

(d) None of the above Acts

Answer – (c)

Explanation :
Some of the acts having relevance to biodiversity conservation –

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1. Import and Export (Control) Act, 1947

2. Mining and Mineral Development (Regulation) Act, 1957

3. Customs Act, 1962

4. Indian Forest Act, 1927

5. Wildlife (Protection) Act, 1972

6. Water (Preservation and Control Pollution) Act, 1974

7. Air (Preservation and Control Pollution) Act, 1981

8. Biological Diversity Act, 2002, etc.

Que 14 – Consider the following kinds of organisms : (UPSC CSE 2012)

1. Bacteria

2. Fungi

3. Flowering plants

Some species of which of the above kinds of organism are employed as biopesticides ?

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

Answer – (d)

Explanation :
Biopesticides are certain types of pesticides derived from such natural material as animals, plants, bacteria, fungi, virus and certain minerals.

Que 15 – Consider the following areas: (UPSC CSE 2012)

1. Bandipur

2. Bhitarkanika

3. Manas

4. Sundarbans

Which of the above are Tiger Reserves?

(a) 1 and 2 only

(b) 1 3 and 4 only

(c) 2, 3 and 4 only

(d) 1, 2, 3 and 4

Answer – (b)

Explanation :
There are about 50 tiger reserves in India. Bhitarkanika is a national park of a wildlife sanctuary.

You can study about Environment and Ecology topic at our Environment and Ecology for Govt Examsarticle.

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