Question

Can can one explain me highlighted portions of the both pages

On left page it is written that:

The decomposition of vegetables
matter into compost is also an example of exothermic process.

On right page it is:

All decomposition reactions are endothermic reactions.

Answer 1

HEY MATE
HERE IS YOUR ANSWER

In an decomposition reaction, energy is usually absorbed and they are termed as endothermic reaction, But in the casw of decomposition of vegetable matter, when microbes reacts on animal or plant waste, a lot of energy is given out which leads to the release of gases thus terming the reaction as exothermic reaction . In other decomposition reaction energy is absorbed to break down the bonds between the substances, but as microbes acts for decomposition of vegetable matter it becomes exothermic

HOPE IT HELPS YOU