What could be the reason for the faster rate of decomposition in the tropics?

Which of the following are included as decomposers?

Which of the following is not a step of decomposition?

Given below are two statements:
Statement $I:$
Decomposition is a process in which the detritus is degraded into simpler substances by microbes.
Statement $II:$
Decomposition is faster if the detritus is rich in lignin and chitin.
In the light of the above statements,choose the correct answer from the options given below:

The factors influencing the rate of decomposition are

Which of the following is not true for humus?