Which substance is formed by the carbonisation of dead
vegetation?.
(a) coal (c) coal gas
(b) coke (d) coal tar
NCERT Class VIII
Science - Exemplar Problems
Chapter 5. Coal and Petroleum
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(a) coal......................................Is the answer
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Answer: The correct answer is Coal which is formed by the carbonisation of dead vegetation.
Explanation:
- When the chlorophyll has been harmed by nutrient deficiency or exposure to toxic particles, vegetation becomes disturbed or dies. The plants wither or cease growing as a result of this damage to the chlorophyll, and depending on the severity of the damage, their colour changes to a brownish or greyish hue.
- Carbon is found in the crust of Earth as carbonates in rocks like marble, limestone, and chalk as well as as hydrocarbons, which are the main ingredients of coal, petroleum, and natural gas. Minerals that are called carbonate are significant suppliers of several different metals, including salt, magnesium, calcium, copper, and lead.
- Thus, carbonization is the lengthy process by which coal is created when dead plants and trees smoulder beneath the earth's surface under conditions of high pressure and temperature. Because they are made of the decaying remains of plants, they are known as fossil fuels.
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