The correct option is 1 only
Explanation
Decomposition is the process by which decomposers break down complex organic matter (detritus) into inorganic substances like carbon dioxide, water, and nutrients. It is a vital component of nutrient cycling in ecosystems.
Statement-wise Analysis:
- Statement 1 is Correct: Decomposition is largely an oxygen-requiring (aerobic) process. The metabolic activities of most decomposers, such as bacteria and fungi, depend on the availability of oxygen to break down organic substrates effectively.
- Statement 2 is Incorrect: Decomposition rates are regulated by climatic factors, primarily temperature and soil moisture. Warm and moist environments accelerate the process. In contrast, low temperature and anaerobiosis (absence of oxygen) inhibit decomposition, resulting in the accumulation of organic materials.
- Statement 3 is Incorrect: The important steps in decomposition are fragmentation, leaching, catabolism, humification, and mineralization. In a natural ecosystem, these steps operate simultaneously on the detritus rather than occurring in a strict, non-overlapping sequence.
Key Takeaway: Decomposition is an aerobic process favored by warm and moist conditions. Its various stages, such as fragmentation and catabolism, occur simultaneously on detritus.