Nastic Movements
Nastic Movements
Quick Movements of Plants or Nastic Movement
Rapid movements are uncommon in plants, but some plants do display such movements in response to stimuli. Touch the tip of a sensitive plant (Mimosa pudica) gently. Only a few leaflets close. When you touch it roughly, all the leaflets close.
In Mimosa pudica (touch me not plant), the leaflets fold up quickly if any leaflet is touched. How does it happen? It happens because the touch triggers a sudden and rapid loss of water (turgor changes) from cells at the base of the leaflets. These movements of sensitive plants in response to touch are very quick. All quick movements are not so quick. For example, the leaves of many plants, including those of Mimosa pudica, remain open during day. When darkness falls, the leaves fold up. Many flowers open after sunrise and close after sunset. All these movements are directed neither towards nor away from the stimulus. Such movements are called Nastic Movements.
Types of Nastic Movements:
Opening and closing of flowers represents a kind of _______________ | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct : (a) Plants show sleep movements according to the day and night pattern of the sun is called photonasty. (b) In Mimosa pudica (touch me not plant), the leaflets fold up quickly if any leaflet is touched. (c) In Mangifera indica (touch me not plant), the leaflets fold up quickly if any leaflet is touched. | |||
| Right Option : A | |||
| View Explanation | |||
Nastic movements are ______________- | |||
| Right Option : C | |||
| View Explanation | |||
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