The Question is from neet-zoology locomotion-and-movement , and it was created by the author T SAILAJA

Question

Which statement regarding the movement in the sensitive plant (Mimosa pudica) is INCORRECT?

T SAILAJA · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant movements, specifically nastic movements in Mimosa pudica.
 **Related Topics**: Turgor pressure, potassium ion transport, seismonasty, nastic movements.
 **Prerequisites**: Basic understanding of plant cell physiology and mechanisms of water movement.
## SOLUTION PATHWAY
**Given Information**:
  The question asks to identify the incorrect statement about the movement in Mimosa pudica (sensitive plant).
  Options describe different aspects of the mechanism.
**Method & Steps**:
 1. Analyze each statement regarding the sensitive plant's movement.
  Reasoning: Mimosa pudica exhibits a rapid leaf-folding response to stimuli like touch or vibrations (seismonasty). This movement is a type of nastic movement, meaning it's non-directional and dependent on internal factors.
 2. Evaluate the role of potassium ions and turgor pressure.
  Working: The movement is caused by changes in turgor pressure within specialized structures called pulvini located at the base of leaves and leaflets.  When stimulated, potassium ions are actively transported *out* of the pulvinus motor cells, leading to water loss by osmosis. This decrease in turgor pressure causes the leaf to droop.
  Key Point: Potassium ion movement is crucial, but the direction is opposite to what option B suggests.
 3. Identify the incorrect statement.
  Result: Option B is incorrect because potassium ions move *out* of the pulvinus cells, not into them.
  Verification: The other options correctly describe aspects of the mechanism: it is a seismonastic and nastic movement, driven by changes in turgor pressure resulting from water loss following potassium efflux.
 ## OPTION ANALYSIS
A ✓:  This statement is correct. The movement is triggered by touch or other stimuli, a characteristic of seismonastic movements.
B :x: This statement is incorrect. Potassium ions are actively transported *out* of the pulvinus cells, not into them. This leads to water loss and a decrease in turgor pressure.
C ✓: This statement is correct. The movement is a nastic movement (non-directional) caused by changes in turgor pressure within the pulvini.
D ✓: This statement is correct. Water moves out of the pulvinus cells due to the loss of potassium ions and the resulting osmotic gradient. This decrease in turgor pressure causes the leaves to droop.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the direction of potassium ion transport:  Remembering that potassium ions move *out* of the pulvinus cells to initiate the movement is crucial.
  2.Misunderstanding the role of turgor pressure:  Understanding that turgor pressure changes are the direct cause of the leaf movement is essential.
 **Quick Tips**:
  1.Use mnemonics to remember potassium ion movement direction (e.g.,  'Potassium out, water out, leaf down').
  2.Relate the movement to the overall plant response to environmental stimuli (defense mechanism).

T SAILAJA · Answer

It is a seismonastic movement triggered by touch or other stimuli.

T SAILAJA · Answer

The correct Option is "It involves the active transport of potassium ions into the pulvinus."

T SAILAJA · Answer

It is a nastic movement caused by changes in turgor pressure.

T SAILAJA · Answer

Water moves out of the pulvinus cells, leading to a decrease in turgor and leaf drooping.

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