Q1. Which of the following is a unique adaptation of mangrove trees to survive in anaerobic soil conditions? View Answer Correct Option: 3. Pneumatophores Explanation: Pneumatophores are specialized aerial roots that grow upward to obtain oxygen in the oxygen-poor (anaerobic) muddy soil where mangroves grow. Q2. What is the term used for the reproductive strategy […]
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Q1. Which statement about estuaries is TRUE? View Answer Correct Option: 1. They receive both fresh and saline water Explanation: Estuaries are regions where freshwater from rivers mixes with saltwater from the sea, forming brackish water. They are highly productive ecosystems. Q2. The Amrit Dharohar scheme is primarily aimed at: View Answer Correct Option: 3.
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Q1. Which of the following is a major difference between a lake and a wetland? View Answer Correct Option: 3. Macrophytes dominate in wetlands, phytoplankton in lakes Explanation: In lakes, the primary producers are phytoplankton due to open water and light. Wetlands, being shallow and nutrient-rich, are dominated by macrophytes (large aquatic plants). Q2. Which
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Q1. Riparian buffers help in controlling eutrophication by: View Answer Correct Option: 3. Filtering sediments and nutrients before they enter water bodies Explanation: Riparian buffers are vegetated areas near water bodies that act as filters to trap sediments, nutrients, and pollutants from surface runoff, thus preventing them from entering aquatic ecosystems. Q2. Which of the
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Q1. What is the primary cause of eutrophication in aquatic ecosystems? View Answer Correct Option: 1. Excessive input of nutrients like nitrogen and phosphorus Explanation: Eutrophication occurs when water bodies receive excess nutrients (mainly nitrogen and phosphorus), often from agricultural runoff, sewage, or industrial discharge. These nutrients promote excessive algal growth, which disrupts the aquatic
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Q1. Which of the following is a function of wetlands? View Answer Correct Option: 1. Groundwater recharge and flood control Explanation: Wetlands serve vital ecological roles such as groundwater recharging, flood mitigation, water purification, and providing habitat for biodiversity. Q2. What causes the decrease in water transparency during eutrophication? View Answer Correct Option: 3. Algal
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Q1. Which of the following is the primary cause of cultural (manmade) eutrophication? View Answer Correct Option: 2. Fertilizer runoff from agricultural fields Explanation: Cultural eutrophication is caused by excess nutrients, especially nitrogen and phosphorus, entering water bodies due to human activities, primarily from fertilizer runoff, untreated sewage, and waste. These nutrients promote algal growth,
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Q1. Which factor does not directly affect the transparency of water in aquatic ecosystems? View Answer Correct Option: 3. Salinity Explanation: Salinity affects water chemistry but not transparency directly. Transparency is mainly affected by phytoplankton, silt, and suspended particles that block sunlight. Q2. What is the difference between oligotrophic and eutrophic lakes? View Answer Correct
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Q1. Which of the following aquatic ecosystems has the highest salt concentration? View Answer Correct Option: 2. Marine Explanation: Marine ecosystems have a salt concentration of 35 ppt or more, which is higher than freshwater (
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Q1. Which of the following regions in India is most affected by desertification? View Answer Correct Option: 2. Rajasthan and Gujarat Explanation: Desertification primarily affects arid and semi-arid regions. Rajasthan and Gujarat have large tracts of such land and are among the worst-affected areas. Q2. What is the role of afforestation in combating desertification? View
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