A: Photomodulation of flowering is a phytochrome regulated process.
R: Active form of phytochrome (Pfr) directly induces floral induction in shoot buds
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
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Vernalisation
A. Enables the plant to have sufficient time to reach maturity
B. Depends not only on a combination of light but also on their relative duration
C. Prevents precocious reproductive development late in the growing season
D. Refers specially to the promotion of flowering by a period of low temperature
E. Phenomenon occurs by changing light and temperature
Choose the correct answer from the options given below:
1. A, C, and E only
2. A, C, D, and E only
3. A, B, C, and D only
4. A, C, and D only
A. Enables the plant to have sufficient time to reach maturity
B. Depends not only on a combination of light but also on their relative duration
C. Prevents precocious reproductive development late in the growing season
D. Refers specially to the promotion of flowering by a period of low temperature
E. Phenomenon occurs by changing light and temperature
Choose the correct answer from the options given below:
1. A, C, and E only
2. A, C, D, and E only
3. A, B, C, and D only
4. A, C, and D only
From NCERT
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The phenomenon that prevents precocious reproductive development late in the growing season of a plant is:
A. Vernalisation
B. Thermoregulators
C. Photoreceptors
D. Seed dormancy
E. Plant inhibitors
Choose the correct answer from the options given below:
1. C only
2. A only
3. D only
4. E & B only
A. Vernalisation
B. Thermoregulators
C. Photoreceptors
D. Seed dormancy
E. Plant inhibitors
Choose the correct answer from the options given below:
1. C only
2. A only
3. D only
4. E & B only
 78%
From NCERT
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A plant bends towards the source of light when exposed to light on only one side. Which of the following is the best explanation of the phenomenon?
| 1. | They need light for photosynthesis |
| 2. | The apices of their stems are attracted by light |
| 3. | Some auxin accumulates on the shaded side to induce greater cell elongation on that side |
| 4. | Light stimulates the cells on the illuminated side to increase in length |
Subtopic: Â Growth Hormones & Auxin |
 76%
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Match List I with List II
Choose the correct answer from the option given below:
| List I | List II |
| A. Indole Acetic Acid | I. Increase length of grapes stalks |
| B. Zeatin | II. Hastens fruit ripening in tomatoes |
| C. Gibberellic acid | III. Overcome apical dominance |
| D. Ethephon | IV. Rooting in stem cuttings |
Choose the correct answer from the option given below:
| 1. | A-II, B-I, C-IV, D-III |
| 2. | A-IV, B-II, C-I, D-III |
| 3. | A-IV, B-III, C-I, D-II |
| 4. | A-III, B-IV, C-II, D-I |
Subtopic: Â Auxin Function |Â Gibberellin |Â Ethylene |
 89%
From NCERT
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NEET 2025 - Target Batch
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NEET 2025 - Target Batch
Seedlings would not have been able to emerge out of the soil into the open if it were not for the:
1. Climactic respiration
2. Washing away of ABA
3. Pressure due to imbibitions
4. Mycorrhizal symbionts
1. Climactic respiration
2. Washing away of ABA
3. Pressure due to imbibitions
4. Mycorrhizal symbionts
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NEET 2025 - Target Batch
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Which of the following growth regulators is an adenine derivative ?
| 1. | Auxin | 2. | Cytokinin |
| 3. | Ethylene | 4. | Abscisic acid |
Subtopic: Â Growth Hormones & Auxin |
 75%
From NCERT
NEET - 2022
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The phenomenon by which the undividing parenchyma cells start to divide mitotically during plant tissue culture is called as :
1. Differentiation
2. Dedifferentiation
3. Redifferentiation
4. Secondary growth
1. Differentiation
2. Dedifferentiation
3. Redifferentiation
4. Secondary growth
Subtopic: Â Differentiation, Dedifferentiation and Redifferentiation |
 74%
From NCERT
NEET - 2022
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The ability of plants to follow different pathways in response to environment leading to formation of different kinds of structures are called :
1. Redifferentiation
2. Development
3. Plasticity
4. Differentiation
1. Redifferentiation
2. Development
3. Plasticity
4. Differentiation
Subtopic: Â Development |
 92%
From NCERT
NEET - 2022
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According to modern ideas about phototropism in plants,
| 1. | light causes auxin to accumulate on the shaded side of a plant stem. |
| 2. | auxin indirectly inhibits elongation of plant stem cells |
| 3. | auxin is produced by the apical meristem of the coleoptile and moves downward. |
| 4. | all hormones move downward via the xylem. |
Subtopic: Â Growth Hormones & Auxin |
 69%
From NCERT
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