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प्रश्न
The plant hormone which triggers the fall of mature leaves and fruits from the plant body is:
विकल्प
auxin
gibberellin
abscisic acid
cytokinin
उत्तर
abscisic acid
Explanation:
Abscisic acid causes abscission, i.e., the falling of leaves and fruits from the plant body.
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संबंधित प्रश्न
What is a plant hormone? Name four plant hormones. State one function of each.
How are tropic movements helpful to plants? Explain with an example.
A plant's response to gravity is called ______.
Tendrils wind around a support in response to ______.
The movement of a plant part in response to the force of attraction exerted by the earth is called :
(a) hydrotropism
(b) geotropism
(c) chemotropism
(d) phototropism
The plant part which exhibits negative geotropism is :
(a) root
(b) stem
(c) branch
(d) leaves
One of the following is not caused by the growth related movement of the concerned plant part. This is:
The movement of sunflower in accordance with the path of sun is due to
While conducting experiments to study the effects of various stimuli on the plants, it was observed that the roots of plant X grow and bend towards two stimuli A and B but bend away from a third stimulus C. The stem of the plant X however bends ” away from stimulus A and B but bends towards the stimulus C. The stimulus B is known to act on the roots due to factors related to Earth. Keeping these points in mind, answer the following questions:
- What could be stimulus A?
- Name the stimulus seen in B.
- What could be stimulus-C?
Observe the three figures given below. Which of the following depicts tropic movements appropriately?
 |
 |
 |
| A | B | C |
