Q. No.The removal or inactivation of which of the following will lead to germination of many types of dormant seeds?
1.
ABA
2.
Ethylene
3.
Cytokinins
4.
Gibberellins
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Many mutants that are especially prone to wilting are deficient in:
1. ABA
2. Ethylene
3. Cytokinins
4. Gibberellins
The fact that various plant hormones can have different effects at different concentrations can explain:
| 1. | Need of photoperiodism for flowering in plants. |
| 2. | Plant hormones being needed in vary high amounts. |
| 3. | Antagonism between auxin and cytokinin in the control of apical dominance. |
| 4. | Cell elongation stimulation in apical meristems and inhibition axillary buds by auxins. |
Hyponastic response in submerged plants may be due to auxin and:
1. ABA
2. Ethylene
3. Cytikinin
4. Gibberellins
The ‘triple response to mechanical stress’ is related to the plant growth regulator:
1. Ethylene
2. ABA
3. Auxin
4. Cytokinin
To render the cells of abscission layer more sensitive to ethylene, an aging leaf produces less and less:
1. Cytokinin
2. Auxin
3. Gibberellin
4. ABA
The newly discovered PGR brassinosteroids have effects qualitatively similar to:
1. Auxins
2. Gibberellins
3. Cytokinins
4. Ethylene
The plant hormones that are produced by wounded plants and play a key role in controlling plant defences against herbivores as well as responsible for enchanting fragrance of jasmine are:
1. Brassinosteroids
2. Strigolactones
3. Jasmonates
4. Auxins
The most important colors in regulating photomorhogenesis in plants are:
1. Violet and Yellow
2. White and Black
3. Green and Orange
4. Red and Blue
Blue light photoreceptors in plant do not regulate:
1. Phototropism
2. Light induced opening of stomata
3. Light induces slowing of hypocotyls elongation
4. Seed germination
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