Grade 11Botany

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

Sakshi

10 Years agoGrade 11

2 Answers

Umakant biswal

10 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 2^nd 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

5 Years 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