The Question is from neet-botany plant-growth-and-development growth, and it was created by the author Mr. NARESH KUMAR K

Question

A seedling is placed horizontally on a rotating platform in the dark.  Which of the following best describes the growth pattern of the seedling's root and shoot after a few days?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: [C]
## CONCEPT FRAMEWORK
	**Primary Concept**: Gravitropism
	**Related Topics**: Plant growth, plant hormones, geotropism
	**Prerequisites**: Basic understanding of plant physiology and growth patterns
## SOLUTION PATHWAY
**Given Information**:
	The seedling is placed horizontally on a rotating platform in the dark.
	We need to determine the growth direction of root and shoot.
**Method & Steps**:
	1. Identify the primary growth stimulus.
		Reasoning: Since the experiment is in the dark, light is not a factor. The primary stimulus affecting growth direction is gravity.
		Formula/Rule: Gravitropism: the directional growth of a plant in response to gravity.
	2. Determine root and shoot response to gravity.
		Reasoning: Roots exhibit positive gravitropism (grow towards gravity), and shoots exhibit negative gravitropism (grow against gravity).
		Key Point: Rotation of the platform doesn't change the overall direction of gravity
	3. Conclude the growth directions.
		Result: The root will grow downwards, and the shoot will grow upwards.
		Verification: Aligns with the definition of gravitropism.
 ## OPTION ANALYSIS
[A] :x: This is incorrect because roots grow downwards and shoots grow upwards due to gravitropism.
[B] :x: This is the opposite of what happens due to gravitropism. Roots grow downwards, and shoots grow upwards.
[C] ✓: This is correct. The root grows downwards (positive gravitropism) and the shoot grows upwards (negative gravitropism) in response to gravity even when rotating.
[D] :x: This is incorrect because the growth is not random but is directed by gravity.
 ## LEARNING AIDS
	**Common Mistakes**:
		1.[Error 1]: Confusing gravitropism with phototropism. : [Remember that phototropism is growth in response to light, which is not relevant here.]
		2.[Error 2]: Thinking rotation would randomize growth. : [Understand that the overall direction of gravity still dictates the growth direction even on a rotating platform.]
	**Quick Tips**:
		1.[Helpful shortcut]: Remember 'Roots Down, Shoots Up' for gravitropism.
		2.[Memory aid]: Imagine a plant growing in soil; the roots always go down, and the stem goes up.

Mr. NARESH KUMAR K · Answer

Both root and shoot will grow horizontally.

Mr. NARESH KUMAR K · Answer

The root will grow upwards, and the shoot will grow downwards.

Mr. NARESH KUMAR K · Answer

The correct Option is "The root will grow downwards, and the shoot will grow upwards."

Mr. NARESH KUMAR K · Answer

Both root and shoot will grow in a random direction.

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