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As an ecosystem, wetlands are useful for which of the following?
  • a)
    For nutrient recovery and recycling
  • b)
    For releasing heavy metals through absorption by plants.
  • c)
    In reducing siltation of rivers by retaining sediments
  • d)
    All the above
Correct answer is option 'D'. Can you explain this answer?
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As an ecosystem, wetlands are useful for which of the following?a) Fo...
Wetlands comprise shallow ponds and marshy areas, covers almost entirely in aquatic vegetation. It provides both storm water attenuation and treatment as it detain flows for an extended period to allow sediments to settle, and to remove contaminants by facilitating adhesion to vegetation and aerobic decomposition.
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The Himalayan ecosystem is highly vulnerable to damage, both due to geological reasons and on account of the stress caused by increased pressure of population, exploitation of natural resources and other related challenges. These aspects may be exacerbated due to the impact of climate change. It is possible that climate change may adversely impact the Himalayan ecosystem through increased temperature altered precipitation patterns, episodes of drought and biotic influences.This would not only impact the very sustenance of the indigenous communities in uplands but also the life of downstream dwellers across the country and beyond.Therefore, there is an urgent need for giving special attention to sustain the Himalayan ecosystem. This would require conscious efforts for conserving all the representative systems.Further, it needs to be emphasized that the endemics with restricted distribution, and most often with specialized habitat requirements, are among the most vulnerable elements. In this respect the Himalayan biodiversity hotspot, with rich endemic diversity, is vulnerable to climate change.The Threats include possible loss of genetic resources and species, habitats and concomitantly a decrease in ecosystem services. Therefore, conservation of endemic elements in representative ecosystems/habitats assumes a great significance while drawing conservation plans for the region.Towards achieving the above, we will have to shift towards contemporary conservation approaches, which include a paradigm of landscape level interconnectivity between protected area systems. The concept advocates a shift from the species-habitat focus to an inclusive focus on expanding the biogeographic range so that natural adjustments to climate change can proceed without being restrictive.Q.With reference to the passage, the following assumptions have been made: 1. To maintain natural ecosystems, exploitation of natural resources should be completely avoided.2. Not only anthropogenic but also natural reasons can adversely affect ecosystems.3. Loss of endemic diversity leads to the extinction of ecosystems.Which of the above assumptions is/are correct?

A species that exertsan influence out of proportion to its abundance in an ecosystem is called a keystone species. The keystone species may influence both the species richness of communities and the flow of energy and materials through ecosystems. The sea star Pisaster the flow of energy and materials through ecosystems. The sea star Pisaster ochraceus, which lives in rocky intertidal ecosystems on the Pacific coast of North America, is also an example of a keystone species. Its preferred prey is the mussel Mytilus californianus . In the absence of sea- stars, these mussels crowd out other competitors in a broad belt of the intertidal zone. By consuming mussels, sea star creates bare spaces that are taken over by a variety of other species. A study at the University of washington demonstrated the influence of Pisaster on species richness by removing sea stars from selected parts of the intertidal zone repeatedly over a period of five years. Two major changes occured in the areas from which sea stars were removed. First, the lower edge of the 46. mussel bed extended farther down into the intertidal zone, showing that sea stars are able to eliminate mussels completely where they are covered with water most of the time. Second, and more dramatically, 28 species of animals and algae disappeared from the sea star removal zone. Eventually only Mytilus, the dominant competitor, occupied the entire substratum. Through its effect on competitive relationships, predation by Pisaster largely determines which species live in these rocky intertidal ecosystems.Q. Consider the following assumptions:1. The food chains/food web in an ecosystem are influenced by keystone species.2. The presence of keystone species is a specific characteristic of aquatic ecosystems.3. If the keystone species is completely removed from an ecosystem, it will lead to the collapse of the ecosystem.With reference to the passage, which of the above assumptions is/are valid?

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As an ecosystem, wetlands are useful for which of the following?a) For nutrient recovery and recyclingb) For releasing heavy metals through absorption by plants.c) In reducing siltation of rivers by retaining sedimentsd) All the aboveCorrect answer is option 'D'. Can you explain this answer?
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As an ecosystem, wetlands are useful for which of the following?a) For nutrient recovery and recyclingb) For releasing heavy metals through absorption by plants.c) In reducing siltation of rivers by retaining sedimentsd) All the aboveCorrect answer is option 'D'. Can you explain this answer? for UPSC 2025 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about As an ecosystem, wetlands are useful for which of the following?a) For nutrient recovery and recyclingb) For releasing heavy metals through absorption by plants.c) In reducing siltation of rivers by retaining sedimentsd) All the aboveCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for UPSC 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for As an ecosystem, wetlands are useful for which of the following?a) For nutrient recovery and recyclingb) For releasing heavy metals through absorption by plants.c) In reducing siltation of rivers by retaining sedimentsd) All the aboveCorrect answer is option 'D'. Can you explain this answer?.
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