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  • (a) Plants do not have any nervous system but yet, if we touch a sensitive plant, some observable changes take place in its leaves. Explain how could this plant respond to the external stimuli and how it is communicated. (b) Name the horm

(a) Plants do not have any nervous system but yet, if we touch a sensitive plant, some observable changes take place in its leaves.
Explain how could this plant respond to the external stimuli and how it is communicated.
(b) Name the hormone that needs to be administered to
(i) increase the height of a dwarf plant.
(ii) cause rapid cell division in fruits and seeds.

 

 

 

 
 
 
 
 

Answers (1)

Plants do not have a nervous system like animals but are known to respond to a number of external
stimuli with the help of receptors and hormones. The receptors help the plants to sense the external
stimulus and act accordingly. As a result of these stimuli, various growth hormones are produced
which result in the movement or directed growth of the plant. A similar response is observed when the
leaves of Touch-me-not plants are touched. They show seismonastic movement due to the presence
of receptors for touch stimulus.

Posted by

Satyajeet Kumar

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