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प्रश्न
What is a plant hormone? Name four plant hormones. State one function of each.
उत्तर
The chemicals that perform the function of control and coordination in plants are called plant hormones.
The four plant hormones and their functions are as follows:
1) Auxin: It promotes cell enlargement and cell differentiation in plants.
2) Gibberelins: It breaks the dormancy in seeds and buds.
3) Cytokinins: It promotes cell division in plants.
4) Abscisic acid: It promotes closing of stomata.
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संबंधित प्रश्न
What are the different types of tropisms? Define each type of tropism. Write the name of stimulus in each case
Name five stimuli which act on plants. Name the type of tropism produced by each one of these stimuli.
The bending of the shoot of a plant in response to light is called :
(a) geotropism
(b) phototropism
(c) thigmotropism
(d) photonasty
A potted plant having straight parts A and B was placed horizontally on its side as shown in Figure (i). After a few days, it was observed that parts A and B of the plant acquired new positions as shown in Figure (ii).
- Name the phenomenon exhibited by the position of plant parts A and B in Figure (ii).
- Name the stimulus (other than sunlight) which causes plant part A to grow and bend upwards, and plant part B to bend downwards.
The response of plants to gravity is known as geotropism. How are plant parts sensitive to gravity? Describe with the help of a diagram.
The plant part which exhibits negative geotropism is ______.
The venus flytrap plants are examples of ______.
Give an example for the movement of plant part which is very quick and can be observed easily.
Why do roots of halophytes show negative geotropism?
Name the stimulus which causes the following movement in plant:
Geotropism
