IAS 2011 — Environment & Ecology

The formation of ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole ?

A sandy and saline area is the natural habitat of an Indian animal species. The animal has no predators in that area but its existence is threatened due to the destruction of its habitat. Which one of the following could be that animal ?

Which one of the following is not a site for in-situ method of conservation of flora ?

Consider the following statements : 1. Biodiversity is normally greater in the lower latitudes as compared to the higher latitudes. 2. Along the mountain gradients, biodiversity is normally greater in the lower altitudes as compared to the higher altitudes. Which of the statements given above is/are correct ?

The Himalayan Range is very rich in species diversity. Which one among the following is the most appropriate reason for this phenomenon ?

The 2004 Tsunami made people realize that mangroves can serve as a reliable safety hedge against coastal calamities. How do mangroves function as a safety hedge ?

Two important rivers - one with its source in Jharkhand (and known by a different name in Odisha), and another with its source in Odisha - merge at a place only a short distance from the coast of Bay of Bengal before flowing into the sea. This is an important site of wildlife and biodiversity and a protected area. Which one of the following could be this ?

With reference to India, consider the following Central Acts : 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 relevance to/bearing on the biodiversity conservation in the country ?

Regarding "carbon credits", which one of the following statements is not correct ?

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 ?

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

Three of the following criteria have contributed to the recognition of Western Ghats-Sri Lanka and Indo-Burma regions as hotspots of biodiversity : 1. Species richness 2. Vegetation density 3. Endemism 4. Ethno-botanical importance 5. Threat perception 6. Adaptation of flora and fauna to warm and humid conditions Which three of the above are correct criteria in this context ?

Consider the following : 1. Photosynthesis 2. Respiration 3. Decay of organic matter 4. Volcanic action Which of the above add carbon dioxide to the carbon cycle on Earth ?

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 :