A) auxin
B) kinetin
C) colchicine
D) ethylene
Correct Answer: C
Solution :
Colchicine is a poisonous chemical, isolated from seeds and bulbs of autumn crocus [Colchicum autumnale). It blocks spindle formation and thus, inhibits the movement of sister chromatids to the opposite poles. The resulting restitution nucleus includes all the chromatids. As a result, the chromosome number of the cell is doubled, which leads to polyploidy.
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