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Question
Name the gaseous plant hormone. Describe its three different actions in plants.
Solution
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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RELATED QUESTIONS
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.
Ethylene retards the senescence of leaves, flowers, and fruits.
Which hormone is produced mostly in all parts of a plant?
Which phytohormones is called secondary hormone?
Describe physiological effects and applications of gaseous hormones in plants.
A farmer grows cucumber plants in his field. He wants to increase the number of female flowers in them. Which plant growth regulation can be applied to achieve this?
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 |
What is epinasty?
Name the following:
A gaseous plant hormone which promotes the ripening of fruits.
The hormone which promotes the ripening of fruits is ______.
