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

Question

Study the following statement
I. Cytokinins are formed primarily in roots
II. Auxin and cytokinin are antagonistic in apical dominance
III. Kinetin (a modified DNA purine) was discovered from herring sperm
IV. Zeatin is auxin
V. Zeatin was firstly extracted from herring
Choose the incorrect one

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
	**Primary Concept**: Plant hormones and their functions, specifically cytokinins and auxins.
	**Related Topics**: Plant growth and development, hormone interactions, apical dominance.
	**Prerequisites**: Basic understanding of plant physiology and hormone functions.
## SOLUTION PATHWAY
**Given Information**:
	Statements about cytokinins and auxins.
**Method & Steps**:
	1. Analyze each statement individually based on established knowledge of plant hormones.
	2. Identify the incorrect statements.
## OPTION ANALYSIS
[A] :x: I and II are correct. Cytokinins are primarily synthesized in the root tips and transported to other parts of the plant. Auxin and cytokinin do have antagonistic effects on apical dominance. Cytokinin promotes lateral bud growth while auxin suppresses it. 
[B] :x: II and III are partially correct. While statement II is correct as explained above, statement III is also correct. Kinetin, a type of cytokinin, was indeed discovered from herring sperm. 
[C] :x: III is correct, as explained above. IV is incorrect because Zeatin is a cytokinin, not an auxin.
[D] ✓: IV and V are incorrect. IV is incorrect because Zeatin is a cytokinin, not an auxin. V is incorrect because Zeatin was first isolated from immature corn kernels (Zea mays), not herring.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing the sites of synthesis and initial discovery of plant hormones: Remember that the place of discovery might not be the primary site of synthesis in the plant itself.
		2. Confusing the different classes of plant hormones and their functions:  Clearly distinguish between auxins, cytokinins, gibberellins, etc., and their respective roles in plant growth and development.
	**Quick Tips**:
		1. Remember that cytokinins promote cell division (cytokinesis) and are involved in delaying senescence.
		2.  Auxins are primarily involved in cell elongation and apical dominance.

B VENKAT · Answer

I and II

B VENKAT · Answer

II and III

B VENKAT · Answer

III and IV

B VENKAT · Answer

The correct Option is "IV and V"

NEET Botany Plant Growth and Development MCQs

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