Correct Option
The correct option is 1, 2, 3 and 4.
Explanation
Ecosystems function through the complex interactions of biotic components (flora, fauna, and microorganisms) with abiotic factors. Species within an ecosystem perform critical roles known as ecosystem services, which include supporting, provisioning, regulating, and cultural services.
Statement-wise Analysis
- Statement 1 is Correct: Primary producers, specifically green plants (flora) and algae, capture solar energy through the process of photosynthesis. This energy is converted and stored as chemical energy in the form of biomass, forming the base of the food web.
- Statement 2 is Correct: Decomposers (such as fungi and bacteria) and detritivores (such as earthworms and insects) break down dead organic materials. This process releases nutrients back into the soil and atmosphere, making them available for reuse by producers.
- Statement 3 is Correct: Specific species play a vital role in fixing atmospheric gases. For example, nitrogen-fixing bacteria (often symbiotic with plant roots) convert atmospheric nitrogen into forms usable by plants. Additionally, plants fix atmospheric carbon dioxide during photosynthesis.
- Statement 4 is Correct: Species, particularly large vegetation cover like forests, play a significant role in regulating climate. They influence precipitation patterns through transpiration, sequester carbon to mitigate the greenhouse effect, and moderate local temperatures.
Key Takeaway
Key Takeaway: Biodiversity is essential for ecosystem stability as species perform fundamental functions including energy flow (production), nutrient cycling (decomposition and gas fixation), and environmental regulation (climate control).