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प्रश्न
How do auxins promote the growth of a tendril around a support?
उत्तर
When tendrils come in contact with any support, the part of the tendril in contact with the object does not grow as rapidly as the part of the tendril away from the object. This is caused by the action of auxin hormone. Less auxin occurs on the side of contact as compared to the free side as a result, auxin promotes growth on the free side and the tendrils coil around the support.
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संबंधित प्रश्न
How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?
What is the stimulus in thigmotropism?
What does a root do in response to gravity? What is this phenomenon known as?
To which directional stimuli do roots respond?
A plant's response to gravity is called ______.
Name five stimuli which act on plants. Name the type of tropism produced by each one of these stimuli.
Which of the following is not caused by a growth movement?
Which of the following acts as a stimulus in the process of hydrotropism?
(a) hydrocarbon
(b) hydrogen oxide
(c) hydrogen chloride
(d) hydrogen peroxide
The movement of a shoot towards light is:
P, Q, R and S are four major types of phytohormones. P is a phytohormone which functions mainly as a growth inhibitor. It promotes the wilting and falling of leaves. Q, R and S are phytohormones which all promote growth of plants in various ways. Q is responsible for the phenomenon of phototropism in plants. R is involved mainly in shoot extensions. The phytohormone S helps in breaking the dormancy of seeds and buds. What are P, Q, R and S? Give one reason each for your choice.
What is meant by positive and negative tropic movements in plants? Explain them by giving suitable examples.
With the help of an experiment, prove that roots are more positively hydrotropic than geotropic.
State whether true or false. If false, correct the statement.
The response of a part of plant to the chemical stimulus is called phototropism.
The stimulus in the process of thigmotropism is:
Assertion (A): If the plant part moves in the direction of gravity, it is called positive geotropism.
Reason (R): Stem shows positive geotropism.
Give one example of geotropism.
Which parts of a plant exhibit Positive hydrotropism?
Define the following term:
Heliotropism
