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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 is the stimulus in thigmotropism?
What happens to the moonflower
- during the daytime, and
- at night?
What is this phenomenon known as?
Which of the following is a growth movement and which is not?
- Folding up of leaves of sensitive plant on touching with hand.
- Folding up of petals of dandelion flower when light fades.
The response of leaves to the sunlight is called ______.
Which of the following is not caused by a growth movement?
There are three plants A, B and C. The flowers of plant A open their petals in bright light during the day but close them when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but close them during the day when there is bright light. The leaves of plant C fold up and droop when touched with fingers or any other solid object.
- Name the phenomenon shown by the flowers of (i) plant A and (ii) plant B.
- Name one flower each which behaves like the flower of (i) plant A and (ii) plant B.
- Name the phenomenon exhibited by the leaves of plant C.
- Name a plant whose leaves behave like those of plant C.
- Which plant/plants exhibit the phenomenon based on growth movements?
In tropic movements, plant parts move
Name the stimulus which causes the following movements in plants.
phototropism, thigmotropism, hydrotropism and geotropism
List two differences between the movement of leaves of a sensitive plant and the movement of a shoot towards light.
Name the following:
The tropic movement of plant parts in response to chemicals.
