Seed packets give a recommended planting depth for the enclosed seeds. The most likely reason some seeds are to be covered with only \({ 1\over 4}\) inch of soil is that these :
1. Seeds do not have an etiolation response
2. Seeds of some kind require light to germinate
3. Seeds require a very high temperature to germinate
4. Do not produce hypocotyl
Subtopic: Â Seed Dormancy (OLD NCERT) |
 61%
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A flash of red-light followed by a flash of far-red light given during the middle of the night to a short day plant will likely:
1. Cause increased flower production
2. Stimulate flowering
3. Inhibit flowering
4. Have no extra effect upon flowering
1. Cause increased flower production
2. Stimulate flowering
3. Inhibit flowering
4. Have no extra effect upon flowering
Subtopic: Â Photoperiodism (OLD NCERT) |
 58%
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Observe the photoperiodic response depicted below and find out which one (A, B, or C) is a short-day plant (SDP), long-day plant (LDP), and day-neutral plant (DNP):
| Options | A | B | C |
| 1. | SDP | DNP | LDP |
| 2. | SDP | LDP | SDP |
| 3. | DNP | LDP | SDP |
| 4. | SDP | LDP | DNP |
Subtopic: Â Photoperiodism (OLD NCERT) |
 80%
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Read the following statements:
(i) For photoperiodism, not only the duration of light period but the duration of dark period is alos of equal importance
(ii) Flowering in certain plants depends not only on a combination of light and dark exposers but also their relative durations
(iii) Shoot apices modify themselves into flowering apices prior to flowering but themselves cannot perceive photoperiods
(iv) The site of perception of light/dark duration of flowering are the meristematic points of shoot and root
(v) The site of perception of light for flowering are the leaves but the site of perception of dark for flowering are not the leaves
Which of the above statements are correct?
1. (i) , (iii) and (v)
2. (i) , (ii) and (iii)
3. (iii), (iv) and (v)
4. (i) and (ii) only
(i) For photoperiodism, not only the duration of light period but the duration of dark period is alos of equal importance
(ii) Flowering in certain plants depends not only on a combination of light and dark exposers but also their relative durations
(iii) Shoot apices modify themselves into flowering apices prior to flowering but themselves cannot perceive photoperiods
(iv) The site of perception of light/dark duration of flowering are the meristematic points of shoot and root
(v) The site of perception of light for flowering are the leaves but the site of perception of dark for flowering are not the leaves
Which of the above statements are correct?
1. (i) , (iii) and (v)
2. (i) , (ii) and (iii)
3. (iii), (iv) and (v)
4. (i) and (ii) only
Subtopic: Â Photoperiodism (OLD NCERT) |
 71%
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A composite plant was made by grafting technique where the stock portion was of a long day plant (LDP) and scion portion was a short day plant (SDP). This composite plant was kept in long day condition. Accordingly which of the following is true?
1. Only stock portion flowers
2. Only scion portion flowers
3. Neither stock nor scion portion flowers
4. Both stock and scion portion flowers
1. Only stock portion flowers
2. Only scion portion flowers
3. Neither stock nor scion portion flowers
4. Both stock and scion portion flowers
Subtopic: Â Photoperiodism (OLD NCERT) |
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A short day plant is continuously projected with red light during night period before flowering stages. It will :
1. Finally flower
2. Finally remain vegetative
3. Die
4. Show abnormally increase in the number of flowers
1. Finally flower
2. Finally remain vegetative
3. Die
4. Show abnormally increase in the number of flowers
Subtopic: Â Photoperiodism (OLD NCERT) |
 54%
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Given below is the representation of the effect of interruption of dark period in a short day plant (SDP). Correctly identify the results of A,B, C and D
A B C D
1. Vegetative Vegetative Flowering Flowering
2. Flowering Flowering Vegetative Vegetative
3. Flowering Vegetative Flowering Vegetative
4. Vegetative Flowering Vegetative Flowering
A B C D
1. Vegetative Vegetative Flowering Flowering
2. Flowering Flowering Vegetative Vegetative
3. Flowering Vegetative Flowering Vegetative
4. Vegetative Flowering Vegetative Flowering
Subtopic: Â Photoperiodism (OLD NCERT) |
 53%
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Match the columns:
1. A = (i) , B =(ii) , C= (iv) , D=(iii)
2. A = (i) , B =(iii) , C= (ii) , D=(iv)
3. A = (iii) , B =(iv) , C= (ii) , D=(i)
4. A = (ii) , B =(iv) , C= (i) , D=(iii)
| Column -I | Column-II | ||
| A. | Substitute of vernalisation | (i) | High temperature |
| B. | Critical photoperiod | (ii) | ABA |
| C. | Stress hormone | (iii) | Gibberellin |
| D. | Devernalisation | (iv) | SDP and LDP |
1. A = (i) , B =(ii) , C= (iv) , D=(iii)
2. A = (i) , B =(iii) , C= (ii) , D=(iv)
3. A = (iii) , B =(iv) , C= (ii) , D=(i)
4. A = (ii) , B =(iv) , C= (i) , D=(iii)
Subtopic: Â Gibberellin |Â Abscisic Acid |Â Photoperiodism (OLD NCERT) |Â Vernalization (OLD NCERT) |
 81%
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Assertion: A correct concentration of auxin and cytokinin is required for the development of root and shoot in a callus
Reason: When the ratio of auxin to cytokinin is high, then only roots develop but when the ratio of cytokinin to auxin is high then only shoots develop
1. If both assertion and reason are true and the reason is the correct explanation of the assertion
2. If both assertion and reason are true but the reason is not the correct explanation of the assertion
3. If assertion is true but reason is false
4. If both assertion and reason are false statements
Reason: When the ratio of auxin to cytokinin is high, then only roots develop but when the ratio of cytokinin to auxin is high then only shoots develop
1. If both assertion and reason are true and the reason is the correct explanation of the assertion
2. If both assertion and reason are true but the reason is not the correct explanation of the assertion
3. If assertion is true but reason is false
4. If both assertion and reason are false statements
Subtopic: Â Growth Hormones & Auxin |
 69%
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Assertion: Vernalization is the acceleration of subsequent flowering by low-temperature treatment.
Reason: The site of vernalization is apical meristem.
1. If both assertion and reason are true and the reason is the correct explanation of the assertion
2. If both assertion and reason are true but the reason is not the correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both assertion and reason are false statements
Reason: The site of vernalization is apical meristem.
1. If both assertion and reason are true and the reason is the correct explanation of the assertion
2. If both assertion and reason are true but the reason is not the correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both assertion and reason are false statements
Subtopic: Â Vernalization (OLD NCERT) |
 51%
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