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Q. No.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%
Consider the given two statements:
I: Seeds of some species remain dormant, even if sown in a favourable space, until a specific environmental cue causes them to break dormancy.
II: Seeds of many desert plants, for example, germinate only after a substantial rainfall.
1. I is correct but II is incorrect.
2. Both I and II are correct and II explains I.
3. Both I and II are correct but II does not explain I.
4. I is incorrect but II is correct.
Subtopic: Seed Dormancy (OLD NCERT) |
Consider the given diagram regarding seed germination and identify the correct statements from the statements given:
| I: | ’A’ shows epigeal germination and ‘B’ shows hypogeal germination. |
| II: | In hypogeal germination, seeds are much less vulnerable to grazing. |
| III: | Plants showing hypogeal germination are more commonly found in nutrient-poor soils. |
| IV: | Plants showing epigeal germination produce a large number of seeds. |
1. Only I, II and III are correct
2. Only I, II and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
Subtopic: Growth |
58%
By continually removing apical buds, horticulturists can remodel a tree or a shrub into remarkable shapes as shown in the given figure. The reason is:
| 1. | When the apical bud is removed, the lowered IAA concentration allows the lateral buds to grow and produce new shoots, which compete to become the lead growth. |
| 2. | When the apical bud is removed, the increased IAA concentration allows the lateral buds to grow and produce new shoots, which compete to become the lead growth. |
| 3. | When the apical bud is removed, the lowered IAA concentration stops the growth of lateral buds and production of new shoots. |
| 4. | When the apical bud is removed, the increased IAA concentration stops the growth of lateral buds and production of new shoots. |
Subtopic: Auxin Function |
75%
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. |
| 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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Identify the correct statements regarding auxins?
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%
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%
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 |
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%
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) |
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