The rate of decomposition of dead organisms is faster in the tropical rainforest than in other biomes because

Step 1: Analyze the question We are asked why dead organisms decompose faster in the tropical rainforest than in other biomes.

Step 2: The concept Decomposition is carried out mainly by bacteria and fungi (decomposers). These organisms work fastest when conditions are:

• Warm (high temperature, which boosts enzyme activity)
• Moist (water is needed for microbial growth and for enzyme action)
• Well supplied with oxygen

The tropical rainforest has high temperatures and heavy, year-round rainfall and humidity. This is why leaf litter there breaks down quickly, and nutrients are recycled fast.

Step 3: Evaluate each option

• A. Consistent cool temperature: Wrong. The rainforest is warm or hot, not cool. Cool temperatures slow down enzyme activity and decomposition.
• B. Availability of moisture: Correct. Abundant rainfall and humidity keep the litter moist, so bacteria and fungi thrive and decompose dead matter rapidly.
• C. Relatively constant daylight: Light does not directly affect decomposers, since most of them do not photosynthesize. It is not the reason.
• D. There are more plants: More plants means more dead material, but not a faster rate of decomposition. Rate depends on the conditions for decomposers.

Step 4: Answer The correct option is B, availability of moisture.

Tip: Remember "Warm + Wet = Quick Rot." Whenever a question asks about the rate of decomposition, look for temperature (warm, not cool) and moisture. In this question, only B fits among the options.