Ecology And Ecosystem

Step 1: Define Rainwater Harvesting.
Rainwater harvesting is the process of collecting and storing rainwater for future use, such as for irrigation, drinking water, or other domestic purposes. Step 2: Benefits of Rainwater Harvesting.
1. Water Conservation: It reduces dependence on groundwater and municipal water supplies, conserving natural water resources.
2. Reduces Flooding: Collecting rainwater prevents it from flowing into storm drains, reducing the risk of flooding in urban areas.
3. Saves Energy: By reducing the need for water treatment and transportation, rainwater harvesting helps conserve energy. Step 3: Method of Rainwater Harvesting.
1. Collection: Rainwater is collected from rooftops or other surfaces.
2. Filtration: The collected rainwater is filtered to remove debris and impurities.
3. Storage: The filtered water is stored in tanks or underground reservoirs for later use.

Step 1: Wetlands and Biodiversity.
Wetlands are crucial habitats for many species of plants, birds, and aquatic life, supporting biodiversity and maintaining ecological balance. Step 2: Wetlands and Water Regulation.
Wetlands act as natural water filters, improving water quality by removing pollutants and also helping to regulate water flow, preventing flooding during heavy rains.

Step 1: Understanding the biosphere and conservation.
The biosphere refers to the zone of life on Earth, encompassing land, water, and air. Conservation in this context refers to the protection and preservation of ecosystems and organisms in their natural habitats. Step 2: Explanation of conservation methods.
- In-situ conservation refers to the conservation of species in their natural habitats, which is what the biosphere represents. It is the most effective way to protect ecosystems and species.
- Ex-situ conservation involves preserving species outside their natural habitats, such as in zoos or botanical gardens, which is not applicable to the biosphere.
- Animal conservation focuses on the protection of animal species, but it doesn't necessarily involve the entire biosphere.
- Environmental conservation is a broader term, but it does not specifically describe the biosphere.
Step 3: Conclusion.
Therefore, the correct answer is (D) In-situ conservation. Final Answer:} In-situ conservation.

The process by which plants make their own food is called photosynthesis. During this process, plants convert carbon dioxide, water, and sunlight into glucose (food) and oxygen. Step 1: Analyzing each option.

• (A) Respiration: Incorrect. Respiration is the process by which plants and animals break down glucose to release energy, not to make food.
• (B) Photosynthesis: Correct. This is the process by which plants make their own food using sunlight, water, and carbon dioxide.
• (C) Transpiration: Incorrect. Transpiration is the process by which water is absorbed and evaporated from the plant, not involved in making food.
• (D) Fermentation: Incorrect. Fermentation is a process that occurs in some organisms to break down sugar without oxygen, not used by plants for food production.

Step 2: Conclusion.
Thus, the correct answer is (B), photosynthesis. Final Answer:} Photosynthesis.