Which of the following is not formed as result of re-differentiation in plants?
1.
Cork cambium
2.
Phellem
3.
Periderm
4.
Secondary xylem
Subtopic: Â Differentiation, Dedifferentiation and Redifferentiation |
 65%
Level 2: 60%+
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Consider the given two statements:
| Statement I: | In cotton, coriander, and larkspur, differences in the shapes of leaves produced in air and those produced in water represent heterophyllous development due to environment. |
| Statement II: | In buttercup, the leaves of the juvenile plant are different in shape from those in mature plants. |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is incorrect; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Â Development |
 56%
Level 3: 35%-60%
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Which plant growth regulators are terpenes?
| 1. | Indole-3-acetic acid |
| 2. | N6-furfurylamino purine |
| 3. | Abscisic acid |
| 4. | Gibberellic acid |
Subtopic: Â Growth Hormones & Auxin |
 86%
Level 1: 80%+
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Auxin was isolated from tips of coleoptiles of oat seedlings by:
1. Charles Darwin
2. F. W. Went
3. Boysen and Jensen
4. Francis Darwin
1. Charles Darwin
2. F. W. Went
3. Boysen and Jensen
4. Francis Darwin
Subtopic: Â Growth Hormones & Auxin |
 93%
Level 1: 80%+
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During mid-1960s, three independent researches reported the purification and chemical characterisation of three different kinds of inhibitors: inhibitor-B, abscission II and dormin. Later all the three were proved to be chemically identical. It was named:
1. Indole-3-acetic acid
2. N6-furfurylamino purine
3. Abscisic acid
4. Gibberellic acid
1. Indole-3-acetic acid
2. N6-furfurylamino purine
3. Abscisic acid
4. Gibberellic acid
Subtopic: Â Abscisic Acid |
 93%
Level 1: 80%+
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Consider the given two statements:
| Statement I: | Auxins like NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic) have been isolated from plants. |
| Statement II: | IAA and indole butyric acid (IBA) are synthetic auxins. |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is incorrect; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Â Growth Hormones & Auxin |
 83%
Level 1: 80%+
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Consider the two statements:
| Assertion(A): | Apical dominance is most likely adaptive. |
| Reason(R): | It is important for the plant to devote energy to growing upward so that it can get more light to undergo photosynthesis. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False. |
| 4. | (A) is False; (R) is True. |
Subtopic: Â Growth Hormones & Auxin |
 76%
Level 2: 60%+
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One of the first gibberellins to be discovered and also the one that remains the most intensively studied form is:
| 1. | GA1 | 2. | GA2 |
| 3. | GA3 | 4. | GA4 |
Subtopic: Â Gibberellin |
 96%
Level 1: 80%+
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Consider the two statements:
| Assertion (A): | Gibberellins are used to increase the length of grape stalks. |
| Reason (R): | Gibberellins help overcome apical dominance. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False. |
| 4. | (A) is False; (R) is True. |
Subtopic: Â Gibberellin |Â Cytokinin |
 80%
Level 1: 80%+
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Consider the two statements:
| Assertion (A): | Spraying sugarcane crop with gibberellins increases the yield by as much as 20 tonnes per acre. |
| Reason (R): | Spraying sugarcane crop with gibberellins increases the length of the stem. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False. |
| 4. | (A) is False; (R) is True. |
Subtopic: Â Gibberellin |
 91%
Level 1: 80%+
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