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What are seismonastic movements and nyctinastic movements? (Kindly explain in simple language not in bookish language)

What are seismonastic movements and nyctinastic movements? (Kindly explain in simple language not in bookish language)

Grade:11

2 Answers

Umakant biswal
5359 Points
5 years ago
@ sakshi 
seismonastic MOVEMENT are also called as thigmonastic movement . 
these are rapid responses to vibration , touch , and flexure , 
for example – suppose the human being touch a plant , then it will show rapid responses to it , 
u can also take example of high speed bending of pulvini leaf , and the sensitive part of mirnosa sensitiva (scientific name ) , and the curvature of insectivorous plant . 
coming to your 2nd query – the nyctinastic movement also called as nastic movement , 
here the plant will show responses to the envoirnmental stimuli , and stimuli means factor . 
u can take example of any enviornmental factor , like heat , sunrise and sunset , raining etc . 
but here , the stimulus and direction of response are not same and its independent . 
that means its not conform always that if raining then this plant will bend towards a particular direction . 
anathor EXAMPLE U CAN TAKE OF DARKNESS, THE RESPONSE OF PLANT ON THE ONSET OF DARKNESS. 
LIKE CLOSING THE PETALS OF FLOWER IN THE DUSK , AND SLEEP MOVEMNET OF LEAVES OF MANY LEGUME PLANTS . 
HOPE IT CLEARS YOUR DOUBT , 
IF NOT , THEN LET ME KNOW .. 

all the best ..
Rishi Sharma
askIITians Faculty 646 Points
one year ago
Dear Student,
Please find below the solution to your problem.

seismonastic MOVEMENT are also called as thigmonastic movement . these are rapid responses to vibration , touch , and flexure , for example – suppose the human being touch a plant , then it will show rapid responses to it , u can also take example of high speed bending of pulvini leaf , and the sensitive part of mirnosa sensitiva (scientific name ) , and the curvature of insectivorous plant . coming to your 2ndquery – the nyctinastic movement also called as nastic movement , here the plant will show responses to the envoirnmental stimuli , and stimuli means factor . u can take example of any enviornmental factor , like heat , sunrise and sunset , raining etc . but here , the stimulus and direction of response are not same and its independent . that means its not conform always that if raining then this plant will bend towards a particular direction . anathor EXAMPLE U CAN TAKE OF DARKNESS, THE RESPONSE OF PLANT ON THE ONSET OF DARKNESS. LIKE CLOSING THE PETALS OF FLOWER IN THE DUSK , AND SLEEP MOVEMNET OF LEAVES OF MANY LEGUME PLANTS .

Thanks and Regards

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