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Q. No.Which of the following is not a function of ethylene?
1.
Breaking seed and bud dormancy
2.
Horizontal growth of seedlings, swelling of axis and apical hook formation in dicot seedlings
3.
Enhancement of respiration rate during ripening of fruits
4.
Closure of stomata during water stress
Subtopic: Ethylene | Abscisic Acid |
82%
From NCERT
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The exponential growth in plants can be expressed as: W1 = W0ert where ‘e’ denotes:
1. Initial size at the beginning of the period
2. base of natural logarithms
3. growth rate/elongation per unit time
4. time of growth
1. Initial size at the beginning of the period
2. base of natural logarithms
3. growth rate/elongation per unit time
4. time of growth
Subtopic: Growth Model |
92%
From NCERT
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In plants, the living differentiated cells, have lost the capacity of division under certain conditions. This phenomenon is termed as:
| 1. | Dedifferentiation | 2. | Proto-differentiation |
| 3. | Redifferentiation | 4. | Secondary differentiation |
Subtopic: Differentiation, Dedifferentiation and Redifferentiation |
53%
From NCERT
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Consider the given two statements:
| I: | Differentiation in plants is open. |
| II: | Cells/tissues arising out of the same meristem have different structures at maturity. |
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
Subtopic: Differentiation, Dedifferentiation and Redifferentiation |
57%
From NCERT
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Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called:
| 1. | Plasticity | 2. | Norm of the reaction |
| 3. | Development noise | 4. | Acclimatisation |
Subtopic: Development |
97%
From NCERT
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Consider the given statements:
| I: | Auxin was first isolated from human urine. |
| II: | They are generally produced by the growing apices of the stems and the roots. |
| III: | IAA and IBA are synthetic auxins. |
| IV: | NAA and 2,4-D have been isolated from plants. |
1. Only I and II are correct
2. Only III and IV are correct
3. I, II and IV are correct
4. I, II, III and IV are correct
Subtopic: Growth Hormones & Auxin |
84%
From NCERT
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Consider the given two statements:
| I: | Removal of shoot tips is widely applied in hedge making and tea plantations. |
| II: | Removal of shoot tips usually results in the growth of lateral buds. |
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
Subtopic: Growth Hormones & Auxin |
90%
From NCERT
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Auxins:
| I: | promote flowering in pineapples |
| II: | induce parthenocarpy in tomatoes |
| III: | like 2,4-D kill monocot weeds |
| IV: | control xylem differentiation |
1. Only I and II are correct
2. Only III is incorrect
3. I, II, III and IV are correct
4. Only I and IV are incorrect
Subtopic: Growth Hormones & Auxin |
60%
From NCERT
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Consider the given two statements:
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
| I: | Spraying sugarcane crop with gibberellins increases the yield by as much as 20 tonnes per acre. |
| II: | Sugarcane stores carbohydrates as sugar in their stems and spraying sugarcane crop with gibberellins increases the length of the stem. |
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
Subtopic: Gibberellin |
88%
From NCERT
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How many of the following can be characterized as action of gibberellins on plants?
| I: | They can be used to increase the length of grape stalks. |
| II: | They can elongate and improve the shape of apple. |
| III: | They speed up malting process in brewing industry. |
| IV: | They hasten the maturity period of juvenile conifers. |
| V: | They promote bolting in many plants with rosette habit. |
| 1. 2 | 2. 3 |
| 3. 4 | 4. 5 |
Subtopic: Gibberellin |
80%
From NCERT
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