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Q. No.There are certain seeds that fail to germinate even when external conditions are favorable. Dormancy in the seed is a biological mechanism that provides protection against it.
1. Seed spoilage
2. Pre-mature germination
3. Embryo abortion
4. Dehydration
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| Statement A: | Vernalization can be employed to overcome seed dormancy. |
| Statement B: | Microbial action is an artificial method to create mechanical abrasions in the seed coat. |
1. Only statement A is correct
2. Only statement B is correct
3. Both statements A and B are correct
4. Both statements A and B are incorrect
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"Cabbages are subjected to chilling treatment". Which of the following effects will be imparted on the cabbages?
1. Induce seed dormancy
2. Break seed dormancy
3. Induce photoperiodic flowering
4. Induce growth
1. Induce seed dormancy
2. Break seed dormancy
3. Induce photoperiodic flowering
4. Induce growth
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What is the reason for sowing winter varieties of rye in autumn?
| 1. | It will provide ambient temperature for the growth and development of plants. |
| 2. | It will induce flowering in one season and death in the second season. |
| 3. | It will induce seed dormancy due to endogenous control. |
| 4. | It will increase the photoperiod requirement of rye flowers. |
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Statement A: Different plants have a different critical duration of light.
Statement B: Day-neutral plants require light exposure equal to critical duration, to induce flowering in them.
1. Only statement A is correct
2. Only statement B is correct
3. Both statements are correct
4. Both statements are incorrect
Statement B: Day-neutral plants require light exposure equal to critical duration, to induce flowering in them.
1. Only statement A is correct
2. Only statement B is correct
3. Both statements are correct
4. Both statements are incorrect
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In which of the following plants, the hypothetical hormone responsible for flowering due to light exposure translocates from leaves to shoot apices to induce flowering?
1. Sugarbeet
2. Tomato
3. Pepper
4. Cucumber
1. Sugarbeet
2. Tomato
3. Pepper
4. Cucumber
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Plant growth is a cumulative effect of:
1. Only genomic control
2. Only intrinsic controls
3. Only extrinsic controls
4. Both extrinsic and intrinsic control
1. Only genomic control
2. Only intrinsic controls
3. Only extrinsic controls
4. Both extrinsic and intrinsic control
Subtopic: Growth |
93%
From NCERT
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Among the following substance, select the substance/(s) that can be employed to delay leaf senescence.
1. Only a
2. Only a and c
3. Only b and c
4. all a, b and c
| a. | Autoclaved herring sperm DNA |
| b. | Corn-kernel suspension |
| c. | Coconut milk |
1. Only a
2. Only a and c
3. Only b and c
4. all a, b and c
Subtopic: Growth Hormones & Auxin |
84%
From NCERT
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Which of the following methods can be used for hedge-making in a garden?
| 1. | Vernalization |
| 2. | Exposure of plant to high-intensity light |
| 3. | Application of cytokinin |
| 4. | Irrigation |
Subtopic: Auxin Function |
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Which of the following fruits cannot be artificially ripened by gaseous plant hormones?
1. Tomato
2. Cherry
3. Mango
4. Banana
1. Tomato
2. Cherry
3. Mango
4. Banana
Subtopic: Ethylene |
61%
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