Q. No.Pruning of plants promotes branching because the auxillary buds get sensitized to:-
1. ethylene
2. gibberellin
3. cytokinin
4. indole acetic acid
Phytohormones are?
| 1. | hormones regulating growth from seed to adulthood |
| 2. | growth regulators synthesised by plants and influencing physiological process |
| 3. | hormones regulating flowering |
| 4. | hormones regulating secondary growth |
Abscisic acid is known as the stress hormone because it
| 1. | breaks seed dormancy |
| 2. | induces flowering |
| 3. | promotes leaf fall |
| 4. | promotes closure of stomata |
Which of the following plant growth regulators (PGRs) promotes root initiation, flowering and
induced parthenocarpy?
(1) Gibberellin
(2) Auxin
(3) Cytokinin
(4) Ethylene
Vernalisation is subjected to plants growing in ?
(1) tropical
(2) sub tropical areas
(3) temperate areas
(4) hot region/arctic region
Gibberellins can promote seed germination because of their influence on
| 1. | rate of cell division |
| 2. | production of hydrolyzing enzymes |
| 3. | synthesis of abscisic acid |
| 4. | absorption of water through hard seed coat |
One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses.They are respectively:-
| 1. | Gibberellin, Auxin, Ethylene |
| 2. | Auxin, Gibberellin, Cytokinin |
| 3. | Gibberellin, Auxin, ABA |
| 4. | Auxin, Gibberellin, ABA |
Identify the incorrect statement about ABA growth regulator.
| 1. | It increases the tolerance of plants against different stresses. |
| 2. | It acts as general plant growth inhibitor and inhibitor of metabolism. |
| 3. | It helps in seed maturation and dormancy. |
| 4. | It promotes morphogenesis and differentiation of shoots. |
Which of the following plant growth hormone increase the yield of sugar by increasing the length of stem in sugarcane?
(1) Cytokinin
(2) Ethylene
(3) Gibberellic acid
(4) Auxin
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