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प्रश्न
How does chemical coordination occur in plants?
उत्तर
- Chemical coordination occurs in plants with the help of plant hormones. Different plant hormones help to coordinate growth, development, and responses to the environment.
- They are synthesized at places away from where they act and diffuse to the area for action; for example, auxin promotes cell growth, gibberellins promote stem growth, cytokinins promote cell division, and abscisic acid inhibits growth, and its effects include wilting of leaves.
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संबंधित प्रश्न
What is the general name of chemical substances which bring about control and coordination in plants?
A plant hormone related with inhibition of senescence is
Auxins are abundantly produced in
Match the items in column A with those of column B.
| Column A | Column B | ||
| (a) | Auxin | (i) | apical dominance |
| (b) | Gibberellin | (ii) | cell-division |
| (c) | Cytokinin | (iii) | fruit ripening |
| (d) | Ethylene | (iv) | internodal elongation |
List five plant growth hormones and briefly describe their roles.
The tea plants are never allowed to grow lengthwise. This is done by cutting their apical buds, a process known as pruning. In this way, tea plants get a dense growth and easy yield. Answer the following questions:
- Name the scientific phenomenon that is being overcome by pruning.
- What plant hormone is responsible for the scientific phenomenon mentioned in (a)?
- Name one plant hormone which inhibits the said phenomenon.
The tea plants are never allowed to grow lengthwise. This is done by cutting their apical buds, a process known as pruning. In this way, tea plants get a dense growth and easy yield. Answer the following question :
What plant hormone is responsible for the scientific phenomenon mentioned in 1.1.
The figure given below shows the stages of ripening in a banana. Answer the question that follow:
Mention two characteristic features of this hormone.
Answer the following question.
What are plant hormones? Name the plant hormones responsible for the following:
- Growth of stem
- Promotion of cell division
- Inhibition of growth
- Elongation of cells
Very Short Answer Question:
What is role of gibberellin in rosette plants?
Gibberellins are synthesised from ______.
Which hormone induces parthenocarpy in tomatoes?
Which of the following is a NOT a naturally occurring phytohormone?
Coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly cut coleoptile stumps.
What is the significance of the above experiment performed by Dr. F. Went?
Flowering in pineapple is promoted by ____________.
Which among the following is the CORRECT statement regarding ethylene?
The only phytohormone which is a gas at ordinary temperature:
