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प्रश्न
Name the gaseous plant hormone. Describe its three different actions in plants.
उत्तर
Ethylene is a gaseous plant hormone.
- Ethylene promotes the ripening of fruits. Eg: Tomato, Apple, Mango, Banana, etc.
- Ethylene inhibits the elongation of stem and root in dicots.
- Ethylene hastens the senescence of leaves and flowers.
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संबंधित प्रश्न
The figure given below shows the stages of ripening in a banana. Answer the questions that follow:
- Name the plant hormone responsible for the above changes.
- Mention two characteristic features of this hormone.
Compound which is most widely used as a source of ethylene is ____________.
Synthesis of ethylene takes place in ______
In which of the following cases ethylene (gaseous phytohormone) synthesized in large amounts by tissues?
- Ripening of fruits
- Senescence
- Cell division promoting activity
- Actively growing apices of stems and roots.
Which hormone is produced mostly in all parts of a plant?
Which phytohormones is called secondary hormone?
Which of the following is the only gaseous plant growth regulator?
Pick up the right options and complete the chart given below and rewrite:
(Options: Antitranspirant, Ethylene, Auxin, ABA, Apical dominance, Gibberellins, Cytokinin, NAA.)
| Sr. No. | Hormone | Example | Function |
| 1 | ____________ | IAA | Cell elongation |
| 2 | Auxin | IBA | ____________ |
| 3 | Stress hormone | ____________ | Delay cell division |
| 4 | ____________ | Zea tin | Cell division |
| 5 | Abscissic acid | ABA | ____________ |
| 6 | Auxin | ____________ | Flowering in pineapple |
Give a definition of the following Apical dominance.
What is epinasty?
