The rate of decomposition is slower if :

The detritus is rich is lignin and chitin

The correct answer is Option (4) – The detritus is rich is lignin and chitin

The primary role of decomposers in the ecosystem is to break down dead organic matter into simple inorganic materials. Decomposers, such as fungi and bacteria, are responsible for the process of decomposition. They play a crucial role in the breakdown of organic matter derived from dead plants, animals, and other organic waste.

Decomposition is largely an oxygen-requiring process. The rate of decomposition is controlled by chemical composition of detritus and climatic factors.

In a particular climatic condition, decomposition rate is slower if detritus is rich in lignin and chitin, and quicker, if detritus is rich in nitrogen and water-soluble substances like sugars.

Temperature and soil moisture are the most important climatic factors that regulate decomposition through their effects on the activities of soil microbes.

Warm and moist environment favour decomposition whereas low temperature and anaerobiosis inhibit decomposition resulting in build up of organic materials.