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Q. No.Based on the given diagram of root tip, which of the following statements will be true?
I: The region shown as A to G is the zone of elongation.
II. The portion of the axis which is undergoing the phase of maturation lies more distal to the phase of elongation.
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Development |
From NCERT
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The given curve:
I: is characteristic of living organism growing in a natural environment.
II: is typical for all cells, tissues and organs of a plant.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
I: is characteristic of living organism growing in a natural environment.
II: is typical for all cells, tissues and organs of a plant.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Development |
75%
The diagram given shows hetrophylly in Larkspur. What will be true regarding this phenomenon?
I: It is more important for plants than most animals.
II. Plants have open growth and development.
1. Both I and II are true and II explains I.
2. Both I and II are true but II does not explain I.
3. I is correct and II is incorrect.
4. I is incorrect and II is correct.
I: It is more important for plants than most animals.
II. Plants have open growth and development.
1. Both I and II are true and II explains I.
2. Both I and II are true but II does not explain I.
3. I is correct and II is incorrect.
4. I is incorrect and II is correct.
Subtopic: Growth Model |
58%
From NCERT
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Identify the correct statements regarding vernalization:
| I: | The process, by which exposure to cold renders plants competent to flower is called vernalization. |
| II: | Even after vernalization, the plant must be subjected to a suitable photoperiod, usually long days. |
| III: | Like photoperiod, vernalization is also perceived in leaves. |
| IV: | In most biennial long day plants that form rosettes, gibberellins treatment can substitute for the cold requirement. |
| 1. | Only I, II and III | 2. | Only I, II and IV |
| 3. | Only II, III and IV | 4. | I, II, III and IV |
Subtopic: Photoperiodism (OLD NCERT) | Vernalization (OLD NCERT) |
Which plant growth regulator will most likely be responsible for the peculiar effect on plant as shown in the given figure?
| 1. Auxins 2. Cytokinins 3. Gibberellins 4. Ethylene |
 |
Subtopic: Gibberellin |
71%
The given figure shows the effects of increasing concentration of a certain PGR on the growth of seven-day-old dark-grown pea seedlings. The effects include a decrease in epicotyl elongation, a thickening of the shoot and a change in orientation of growth from vertical to horizontal. Which PGR would be responsible for these effects?
| 1. Auxins | 2. Cytokinins |
| 3. Gibberellins | 4. Ethylene |
Subtopic: Growth Hormones & Auxin |
The diagram shows the schematic representation of an experiment that made bioassay of auxins possible. This experiment was done by:
| 1. Darwin | 2. Boysen Jenson |
| 3. Paal | 4. Went |
Subtopic: Auxin Function |
68%
Identify the correct statements regarding auxins?
I: Auxin stimulates cell elongation by stimulating wall-loosening factors, such as expansins, to loosen cell walls.
II: When auxin and cytokinin are applied to callus, rooting can be generated with higher auxin to cytokinin ratios, shoot growth is induced by lower auxin to cytokinin ratios.
III: Auxin induces the formation and organization of phloem and xylem.
IV: In low concentrations, auxin can inhibit ethylene formation and transport of precursor in plants; however, high concentrations can induce the synthesis of ethylene.
1. Only I, II and III
2. Only I, III and IV
3. Only II, III and IV
4. I, II, III and IV
I: Auxin stimulates cell elongation by stimulating wall-loosening factors, such as expansins, to loosen cell walls.
II: When auxin and cytokinin are applied to callus, rooting can be generated with higher auxin to cytokinin ratios, shoot growth is induced by lower auxin to cytokinin ratios.
III: Auxin induces the formation and organization of phloem and xylem.
IV: In low concentrations, auxin can inhibit ethylene formation and transport of precursor in plants; however, high concentrations can induce the synthesis of ethylene.
1. Only I, II and III
2. Only I, III and IV
3. Only II, III and IV
4. I, II, III and IV
Subtopic: Auxin Function |
56%
What will be true for plant growth regulator involved in the responses in plants as shown in the given figure?
I: The PGR is ABA.
II: Chemically, it is a terpene.
III: Seed germination is inhibited by it in antagonism with gibberellin.
IV: It is also produced in the roots in response to decreased soil water potential.
I: The PGR is ABA.
II: Chemically, it is a terpene.
III: Seed germination is inhibited by it in antagonism with gibberellin.
IV: It is also produced in the roots in response to decreased soil water potential.
| 1. Only I, II and III | 2. Only I, II and IV |
| 3. Only I, III and IV | 4. Only II, III and IV |
Subtopic: Abscisic Acid |
77%
From NCERT
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Given below is a diagram showing a long day plant and a short day plant subjected to different photoperiods. What would be the response in A, B, C and D conditions for the two plants?
| A | B | C | D | |
| 1. | Flowers | No Flowering | No Flowering | Flowers |
| 2. | No flowering | Flowers | Flowers | No Flowering |
| 3. | Flowers | No Flowering | Flowers | No Flowering |
| 4. | No flowering | Flowers | No Flowering | Flowers |
Subtopic: Vernalization (OLD NCERT) |
81%
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