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Question

When the leaf of the 'touch-me-not'(chui-mui, Mimosa pudica) plant is touched, the leaf drops because.


A
A nerve signal passes through the plant
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B
The temperature of the plant increases
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C
Water is lost from the cells at the base of the leaf
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D
The plant dies
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Solution

The correct option is D Water is lost from the cells at the base of the leaf
  • The Mimosa plant folds the leaflets on stimulus with touch. The stimulus is passed on to the entire branch and then the whole plant with all the leaflets close. 
  • There is a loss of water from the cells at the base of the leaf.  
  • This is due to the passing of the impulse which causes a change in the turgor pressure in the cells causing the leaflets to be closed. 
Thus, the correct answer is option C. 

Biology

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