Question

Burnt grains and wood are preserved in the ______ form

Answer 1

Answer:

ash

Explanation:

as the wood and grain are burnt they release water vapour and a black powdery substance is formed

Answer 2

Answer:

After burning the grains and wood, they can be preserved in form of ash or charcoal.

Explanation:

There are fibres in form of cellulose and minerals present in grains and woods. When the grain and wood are burnt, they react with elements of air like oxygen, carbon, hydrogen and forms carbon dioxide and ashes. The released carbon dioxide went back into atmosphere. When there is no air present, then wood is converted into Charcoal and can be preserved.