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Questions
Describe physiological effects and applications of gaseous hormones in plants.
Describe physiological effects and applications of ethylene.
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Solution
Ethylene is the gaseous hormone. Its applications and physiological effects are as follows:
- It promotes the ripening of fruits like bananas, apples and mangoes.
- It stimulates the initiation of lateral roots in plants and breaks the dormancy of bud and seed.
- It accelerates the abscission activity in leaves, flowers and fruits by forming of abscission layer.
- Ethylene inhibits the growth of lateral buds and causes apical dominance and retards flowering.
- It is associated with the enhancement of the process of senescence of plant organs.
- It inhibits flowering in most plants except pineapple.
- It causes epinasty (drooping) of leaves and flowers.
- It increases the activity of chlorophyllase enzyme causing degreening effect in banana and Citrus fruits.
RELATED QUESTIONS
A higher concentration of ethylene is found in
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.
______ is a gaseous hormone involved in the abscission of organs and acceleration of fruit ripening.
Which hormone is produced mostly in all parts of a plant?
Which hormone is responsible for fruit ripening?
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 |
Name the following:
A gaseous plant hormone which promotes the ripening of fruits.
The hormone which promotes the ripening of fruits is ______.
Which hormone promotes internode/petiole elongation in deep water rice?
