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(B) : Taylor et al. $(1957)$ conducted experiments on $Vicia$ $faba$ (broad bean) to prove the semi-conservative replication of $DNA$.He fed dividing

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Vicia faba

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(B) : Taylor et al. $(1957)$ conducted experiments on $Vicia$ $faba$ (broad bean) to prove the semi-conservative replication of $DNA$.He fed dividing cells of the root tips of $Vicia$ $faba$ with radioactive $^3H$-thymidine instead of normal thymine and found that all the chromosomes became radioactive.Labelled thymine was then replaced with normal thymine.The next generation showed radioactivity in one of the two chromatids of each chromosome,while in the subsequent generation,radioactivity was present in $50\%$ of the chromosomes.This is possible only if,out of the two strands of a chromosome,one is formed afresh while the other is conserved at each replication.

Taylor conducted the experiments to prove the semi-conservative mode of chromosome replication on:

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