UPSC 2011 › Environment & Ecology › Ecosystems & Ecology Concepts

3 questions · 2011 · answers as per the UPSC key

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UPSC 2011 · Q22 · Environment & Ecology › Ecosystems & Ecology Concepts · Save

In the context of ecosystem productivity, marine upwelling zones are important as they increase the marine productivity by bringing the

  1. Decomposer microorganisms to the surface,
  2. Nutrients to the surface,
  3. Bottom-dwelling organisms to the surface.

Which of the statements given above is/are correct?

(a) 1 and 2
(b) 2 only
(c) 2 and 3
(d) 3 only
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Answer: (b) 2 only
UPSC 2011 · Q23 · Environment & Ecology › Ecosystems & Ecology Concepts · Save

If a tropical rain forest is removed, it does not regenerate quickly as compared to a tropical deciduous forest. This is because

(a) the soil of rain forest is deficient in nutrients
(b) propagules of the trees in a rain forest have poor viability
(c) the rain forest species are slow-growing
(d) exotic species invade the fertile soil of rain forest
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Answer: (a) the soil of rain forest is deficient in nutrients
UPSC 2011 · Q61 · Environment & Ecology › Ecosystems & Ecology Concepts · Save

Biodiversity forms the basis for human existence in the following ways:

  1. Soil formation
  2. Prevention of soil erosion
  3. Recycling of waste
  4. Pollination of crops

Select the correct answer using the codes 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
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Answer: (d) 1, 2, 3 and 4