A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: B
Solution :
Replacement of organic parts by mineral deposits is called petrification. Fossils formed through petrification are termed petrified fossils. These fossils consists of only the hard parts of extinct organisms. Moulds of hardened and fossilized mud that surrounded an extinct individuals have been found. In most cases, the buried individuals have been completely destroyed, but the moulds have retained true copies of their shapes. Sometimes, a mould is found with petrified fossil of the individual also. Such fossils are termed as casts.
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