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प्रश्न
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
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उत्तर
In plants, growth, development, and response to the environment are controlled and coordinated by a special class of chemical substances known as phytohormones. They are naturally occurring organic substances which are synthesized in minute quantities. These hormones are produced in one part of the plant body and are translocated to other parts. For example, a hormone produced in the roots is translocated to other parts where they are required.
- Gibberellins
- Cytokinins
- Abscisic acid
- Auxins
संबंधित प्रश्न
Common gibberellin is
Stems are
List five plant growth hormones and briefly describe their roles.
Conversion of nitrates to nitrogen is called ______.
Name the phytohormone related with the given phenomenon.
- Apical dominance
- Bolting of Cabbage
- Artificial ripening of fruit
- Acts as Anti-transpirant by closing stomata
Which hormone causes Bakanae disease of rice?
In which part of plant does auxin synthesis occur?
Match the following lists and select the correct option.
| List I | List II | ||
| i. | 2,4-D | a. | Promotes senescence and ripening of fruits |
| ii. | ABA | b. | DelaysJeaf senescence |
| iii. | Gibberellins | c. | Increases the length of the sugarcane stem |
| iv. | Ethylene | d. | Kills dicotyledonous weeds without affecting mature monocotyledonous plants |
| e. | Stimulates the closure of stomata |
Name the first hormone that was discovered in plant and its precursor.
A plant growth inhibitor hormone which causes wilting of leaves is ______.
