The Question is from neet-botany cell-cycle-and-cell-division introduction, and it was created by the author K SURESH KUMAR

Question

Chromosome number can be doubled by using which of the following?

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
	**Primary Concept**: Polyploidy induction
	**Related Topics**: Plant hormones, Cell cycle, Mitosis, Meiosis
	**Prerequisites**: Basic knowledge of plant hormones and cell division.
## SOLUTION PATHWAY
**Given Information**:
	* The question asks about doubling chromosome number.
	*  Options are plant growth regulators and a chemical.
**Method & Steps**:
	1. Recall the function of each option.
		Reasoning: Indole acetic acid (IAA) is an auxin that promotes cell elongation and growth, GA (Gibberellic Acid) promotes stem elongation and seed germination, and Zeatin is a cytokinin that promotes cell division. Colchicine is a chemical that inhibits microtubule formation, disrupting mitosis.
	2. Identify the chemical that leads to chromosome doubling.
		Reasoning: Colchicine disrupts the mitotic spindle, preventing sister chromatids from separating during cell division. This results in a cell with a doubled chromosome number.
	3. Select the correct answer.
		Result: Colchicine is the correct answer.
## OPTION ANALYSIS
[A] :x: Indole acetic acid promotes cell elongation, not chromosome doubling.
[B] :x: Gibberellic Acid promotes stem elongation and seed germination, not chromosome doubling.
[C] :x: Zeatin promotes cell division, not chromosome doubling.
[D] ✓: Colchicine inhibits microtubule formation during mitosis, leading to chromosome doubling (polyploidy).
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing plant hormones with chromosome doubling agents: Understand that plant hormones regulate growth and development, while colchicine is a specific chemical used for polyploidy.
	**Quick Tips**:
		1. Remember that colchicine is the key chemical associated with polyploidy induction.
		2. Colchicine disrupts microtubule formation, which is crucial for mitosis.

K SURESH KUMAR · Answer

Indole acetic acid

K SURESH KUMAR · Answer

GA

K SURESH KUMAR · Answer

Zeatin

K SURESH KUMAR · Answer

The correct Option is "Colchicines"

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