Differentiate between nastic movements and Tropic movements?
Answers
Answer:
Here is the answer, hope you like it...Tropic movements are very slow and always in the direction of stimulus. All parts of a plant (roots, stem and leaves etc. exhibit these movements. Movement of shoot towards the light and not towards gravity is an example of this kind of movement.
Nastic movements are rapid and neither away nor towards the stimulus. Leaves and petals of flower exhibit these movements. The bending and drooping of leaves in 'Touch-me-not' plant is an example of this kind of movement.
Explanation:
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STIMULUS.....
WE ARE LIVING IN SUCH ENVIRONMENT IN WHICH CHANGES TAKE PLACE EVERY MINUTE.....
THESE CHANGES IS CALLED AS STIMULUS....
MOVEMENT....
IN ORDER TO RESPOND SUCH STIMULUS WE NEED SOME MOVEMENT. FOR HUMANS WHICH HAVE WELL DEFINED NERVOUS SYSTEM IT IS QUITE EASY TO RESPOND.....
BUT FOR PLANTS WITH NO NERVOUS SYSTEM THIS TASK IS NOT PERFORMED EASILY...
SO IN PLANTS IN ORDER TO RESPOND STIMULI THEY HAVE TWO MOVEMENTS......
NASTIC MOVEMENT.....
SUPPOSE A STIMULI ACTS ON THE PLANT THAN PLANT SHOW MOVEMENT IN ORDER TO RESPOND THE SAME. SO WHEN A MOVEMENT OR YOU CAN SAY RESPOND IS INDEPENDENT OF THE STIMULI DIRECTION THAN THIS TYPE OF MOVEMENT IS KNOWN AS NASTIC MOVEMENT......
FOR EXAMPLE....
A FLOWER NAMELY MOON FLOWER OPEN IT'S PETALS ONLY AT NIGHT....WHICH MEANS IT RESPOND TO THE LOW INTENSITY OF LIGHT BY OPENING IT'S PETAL WHICH IS FREE FROM DIRECTION......
TROPIC MOVEMENT....
WHEN THE MOVEMENT OF PLANT DUE TO STIMULUS IS DEPENDENT ON THE DIRECTION OF THE STIMULI THAN SUCH TYPE OF MOVEMENT IS KNOWN AS TROPIC MOVEMENT....
FOR EXAMPLE....
THE SUNFLOWER OR ANY OTHER PLANT BEND IT'S BODY IN THE DIRECTION OF SUN LIGHT....
TROPIC MOVEMENT IS DUE TO THE DIFFERENCE BETWEEN THE CONCENTRATION OF PLANT HORMONES IN THE PLANT BODY..
NASTIC MOVEMENT IS DUE TO DIFF. BETWEEN THE CONCENTRATION OF WATER IN PLANT CELLS.....
HOPE IT'S HELP YOU....