Discussion
Assertion (A): Wet fruit and vegetable residues are digested rather than burnt.
Reason (R): Drying such a residue can consume more energy than the residue itself contains.
Select the correct answer from the options below.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason gives the arithmetic. Evaporating water takes about 2.3 MJ per kilogram, so a residue at 85 per cent moisture requires roughly 2 MJ of drying energy for every kilogram of wet material - against perhaps 2.5 MJ released by burning the dry matter it contains.
The margin is negative or negligible once losses are counted, so combustion cannot pay. Anaerobic digestion takes place in water and needs no drying at all, which is why wet residues go that way.
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