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Q.

Select the correct match.

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a

G1 phase- Replication of DNA

b

S phase- Centrioles duplicate in the cytoplasm in animal cells 

c

G2 phase- The number of chromosomes doubles

d

G0 phase- Cells do not show metabolism

answer is B.

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Detailed Solution

In animal cells, during the S phase, DNA replication begins in the nucleus, and the centriole duplicates in the cytoplasm.
G1 phase corresponds to the interval between mitosis and initiation of DNA replication. During G1 phase the cell is metabolically active and continuously grows but does not replicate its DNA. 
During the G2 phase, proteins are synthesised in preparation for mitosis while cell growth continues.
Cells in the G0 stage remain metabolically active but no longer proliferate unless called on to do so depending on the requirement of the organism.

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