The Question is from neet-botany plant-growth-and-development , and it was created by the author D VINOD

Question

I. Kinetin is a degradative substance from DNA
II. ABA is present in all plants including lower plants
III. Low ratio of cytokinin to auxin favours root formation only
IV. ABA is synthesised catabolically through glycolysis pathway
Choose the correct combination of options

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
	**Primary Concept**: Plant Growth Regulators
	**Related Topics**: Plant Physiology, Hormones, Growth and Development
	**Prerequisites**: Basic knowledge of plant hormones and their functions.
## SOLUTION PATHWAY
**Given Information**:
	Four statements about plant hormones – Kinetin, ABA, Cytokinin, and Auxin.
**Method & Steps**:
	1. **Analyze each statement individually based on established plant physiology principles.**
	Reasoning: Evaluate the truthfulness of each statement based on scientific knowledge.
	2. **Identify the correct combination based on the analysis.**
	Working: Evaluate each option against the analyzed statements.
	3. **Select the option that includes only the true statements.**
	Result: Option C (III only)
	Verification: Cross-check with reliable sources on plant physiology.
 ## OPTION ANALYSIS
[A] :x: I is incorrect. Kinetin is a type of cytokinin, a plant growth regulator, but it's synthetic and not a degradation product of DNA.
II is incorrect. While ABA is present in higher plants, its presence in lower plants (like algae) is debated and generally considered limited or absent.
[B] :x: II is incorrect (as explained above).
III is correct. A low cytokinin to auxin ratio promotes root formation, while a high ratio promotes shoot formation.
[C] ✓: III is correct (as explained above).
[D] :x: I is incorrect (as explained above).
IV is incorrect. ABA biosynthesis is through the terpenoid pathway (MEP and MVA pathways), not glycolysis.
 ## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing the roles of different plant hormones: Carefully study the specific functions of each hormone.
		2. Misinterpreting the relationship between cytokinin and auxin in root/shoot formation: Remember that a low cytokinin/auxin ratio favours root formation, while a high ratio favours shoot formation.
	**Quick Tips**:
		1. Create flashcards or mnemonics to remember the functions of different plant hormones.
		2. Visualize the effects of different cytokinin/auxin ratios on plant development.

D VINOD · Answer

I and II only

D VINOD · Answer

II and III only

D VINOD · Answer

The correct Option is "III only"

D VINOD · Answer

I and IV only

NEET Botany Plant Growth and Development MCQs

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