UPSC 2013 • Q22Environment, Ecology & Climate ChangeMedium
Ecosystem Principles & Ecological Interactions
In the grasslands, trees do not replace the grasses as a part of an ecological succession because of
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All Environment, Ecology & Climate Change→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 1. its escape into the outer stratosphere. 2. the photosynthesis by phytoplankton in the oceans. 3. the trapping of air in the polar ice caps. Which of the statements given above is/are correct?
UPSC 2011•Q21•Medium
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?
UPSC 2011•Q22•Medium
If a tropical rain forest is removed, it does not regenerate quickly as compared to a tropical deciduous forest. This is because
UPSC 2011•Q23•Medium
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?
UPSC 2011•Q48•Easy
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