Question

Assertion: Colchicine reduces the
chromosome number.
Reason: It promotes the movement of
sister chromatids to the opposite poles.​

Answer 1

• Assertion:- Colchicine reduces the chromosome number.

• Reason:- It promotes the movement of sister chromatids to the opposite poles.

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Both Assertion and Reason are wrong,

Because,

• Colchicine is a Mitotic Poison which inhibits Spindle Formation in Mitosis, and Holds or keep the cell in Metaphase. Therefore, Assertion is wrong As it does not reduces the Chromosome number.

• Proteins promotes the movement of sister chromatids to the opposite poles, Therefore, Reason is also wrong as Colchicine doesn't promotes movement of sister chromatids.

$\huge{\bold{\underline{Additional \: Points:-}}}$

• Azide (NaN₃) & Cyanide (HCN) Inhibits Prophase of Mitosis.

• Mustard gas causes agglutination (clotting) of chromosomes in Mitosis.

• Ribonuclease is an RNA Enzyme which acts as Poison at Prophase as it is harmful to the cells.

• Chalones (Glycoproteins) inhibits Mitosis at Varying stages of Cell division.

• If a Cell is Exposed to X - Ray's, Due to it's electromagnetic nature, It causes the cell to undergo uncontrolled Mitosis. And may lead to Breakage of chromosomes.

Answer 2

Answer:

Both Assertion and Reason are wrong,

Because,

Colchicine is a Mitotic Poison which inhibits Spindle Formation in Mitosis, and Holds or keep the cell in Metaphase. Therefore, Assertion is wrong As it does not reduces the Chromosome number.

Proteins promotes the movement of sister chromatids to the opposite poles, Therefore, Reason is also wrong as Colchicine doesn't promotes movement of sister chromatids.

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