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Questions
Describe physiological effects and applications of gaseous hormones in plants.
Describe physiological effects and applications of ethylene.
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
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.
To increase the sugar production in sugarcanes they are sprayed with ______
Which hormone is produced mostly in all parts of a plant?
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?
Ethylene is synthesised in ______.
Which of the following is the only gaseous plant growth regulator?
Explain the role of chlorophyllase enzyme in banana.
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?
