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Q. No.Natural cytokinins are synthesised in all the following regions in a plant except:
1. Root apices
2. Developing shoot buds
3. Young fruits
4. Senescent organs
Subtopic: Cytokinin |
87%
From NCERT
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Ethylene enhances the respiration rate during ripening of the fruits. This rise in rate of respiration is called:
1. respiratory climactic.
2. utilisation coefficient.
3. respiratory hyperpnea.
4. oxygen debt.
1. respiratory climactic.
2. utilisation coefficient.
3. respiratory hyperpnea.
4. oxygen debt.
Subtopic: Ethylene |
96%
From NCERT
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Ethylene:
1. Only I is correct
2. Only II is correct
3. Both I and II are incorrect
4. Both I and II are correct
| I: | is used to initiate flowering and for synchronising fruit-set in pineapples. |
| II: | induces flowering in mangoes. |
1. Only I is correct
2. Only II is correct
3. Both I and II are incorrect
4. Both I and II are correct
Subtopic: Ethylene |
82%
From NCERT
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Consider the two statements:
| Assertion (A): | The most widely used compound as source of ethylene is ethephon. |
| Reason (R): | Ethephon in an aqueous solution is readily absorbed and transported within the plant and releases ethylene slowly. |
| 1. | Both (A) and (R) are True and (R) correctly explains the (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain the (A). |
| 3. | (A) is True; (R) is False. |
| 4. | (A) is False; (R) is True. |
Subtopic: Ethylene |
82%
From NCERT
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Seed germination is inhibited by ABA in antagonism with:
1. Auxins
2. Ethylene
3. Kinetins
4. GAs
1. Auxins
2. Ethylene
3. Kinetins
4. GAs
Subtopic: Gibberellin | Abscisic Acid |
86%
From NCERT
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Rapid multiplication leads to ‐
1. Geometrical Progression
2. Natural selection
3. Suvival of fittest
4. Struggle for Existence
1. Geometrical Progression
2. Natural selection
3. Suvival of fittest
4. Struggle for Existence
Subtopic: Growth |
81%
From NCERT
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Given below are two statements
In light of the above statements, choose the correct answer from the options given below
| Statement I: | Flowering in some plants depends on the relative duration of light and dark exposure |
| Statement II: | Some plants require the exposure of light for a period exceeding a well‐defined critical duration and are called long‐day plants |
| 1. | Both Statement I and Statement II are true |
| 2. | Both Statement I and Statement II are false |
| 3. | Statement I is true but Statement II is false |
| 4. | Statement I is false but Statement II is true |
Subtopic: Photoperiodism (OLD NCERT) |
86%
From NCERT
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Match List I with List II
Choose the correct answer from the options given below:
1. A ‐ IV , B ‐ III , C ‐ II , D ‐ I
2. A ‐ III , B ‐ IV , C ‐ I , D ‐ II
3. A ‐ IV , B ‐ III , C ‐ I , D ‐ II
4. A ‐ III , B ‐ IV , C ‐ II , D ‐ I
| List I | List II | ||
| A. | IAA | I. | Bolting |
| B. | ABA | II. | Ripening of Fruits |
| C. | GA | III. | Weed Free Lawns |
| D. | Ethylene | IV. | Stomatal Closure |
1. A ‐ IV , B ‐ III , C ‐ II , D ‐ I
2. A ‐ III , B ‐ IV , C ‐ I , D ‐ II
3. A ‐ IV , B ‐ III , C ‐ I , D ‐ II
4. A ‐ III , B ‐ IV , C ‐ II , D ‐ I
Subtopic: Auxin Function | Gibberellin | Ethylene | Abscisic Acid |
82%
From NCERT
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Which of the following statements for plant growth is incorrect?
1. It is localised
2. It is open ended
3. It is indeterminate
4. It does not involve increase in number of parts
1. It is localised
2. It is open ended
3. It is indeterminate
4. It does not involve increase in number of parts
Subtopic: Growth |
77%
From NCERT
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Optimum temperature required for the proper growth in most of the plants is
1. 30-45°C
2. 10-20°C
3. 28-30°C
4. 0-10°C
1. 30-45°C
2. 10-20°C
3. 28-30°C
4. 0-10°C
Subtopic: Growth |
57%
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