Consider the following statements regarding 'Biogeochemical Cycles' in the context of EVS teaching and ecology: 1. Under 'Gaseous Cycles', the atmosphere or hydrosphere serve as the main reservoirs, and it includes the 'nitrogen cycle', 'carbon cycle', and 'oxygen cycle', which ensure the rapid recycling of elements in the ecosystem. 2. Under 'Sedimentary Cycles', the Earth's crust or rocks serve as the main reservoir, and it includes the 'phosphorus cycle' and 'sulfur cycle', whose speed is considerably slower compared to gaseous cycles. 3. The 'carbon cycle' is a complete gaseous cycle in which human activities, the burning of fossil fuels, and deforestation have no impact on ecological balance because oceans and forests instantly absorb all carbon. Which of the above statement(s) is/are correct?

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Gaurav Shrivastava · Accepted Answer

Statement 1 is correct because the main reservoirs of gaseous cycles (such as carbon, nitrogen, and oxygen cycles) are the atmosphere or hydrosphere, and elements are recycled rapidly in them. Statement 2 is also correct because the main reservoirs of sedimentary cycles (such as phosphorus and sulfur cycles) are rocks and soil, and their speed is slower compared to gaseous cycles. Statement 3 is incorrect because human activities, excessive burning of fossil fuels, and indiscriminate deforestation have severely affected the natural balance of the carbon cycle, giving rise to problems like global warming. Therefore, only statements 1 and 2 are correct.

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Consider the following statements regarding 'Biogeochemical Cycles' in the context of EVS teaching and ecology:

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