Q. No.Identify the correct statements:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | Auxins, gibberellins and cytokinins are plant growth promoters. |
| II: | ABA is an inhibitor of plant growth activities. |
| III: | Ethylene is largely a plant growth promoter. |
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Growth Hormones & Auxin | Gibberellin | Cytokinin | Ethylene | Abscisic Acid |
72%
From NCERT
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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: Growth Hormones & Auxin |
94%
From NCERT
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F. Skoog and his co-workers observed that from the internodal segments of tobacco stems the callus proliferated only if extracts of vascular tissues or yeast extract or coconut milk or DNA supplements the medium already containing:
1. Auxins
2. Gibberellins
3. Ethylene
4. Kinetins
1. Auxins
2. Gibberellins
3. Ethylene
4. Kinetins
Subtopic: Growth Hormones & Auxin |
From NCERT
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Match the PGR in Column I with their chemical nature in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A. | Auxin | P. | F. W. Went |
| B. | Gibberellin | Q. | E. Kurosawa |
| C. | Cytokinin | R. | F. Skoog and co-workers |
| D. | Ethylene | S. | H. H. Cousins |
Codes:
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | R | S | P |
| 3. | R | S | P | Q |
| 4. | S | P | Q | R |
Subtopic: Growth Hormones & Auxin |
92%
From NCERT
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Auxin was first isolated from:
| 1. | Coconut milk | 2. | Barley endosperm |
| 3. | Oat coleoptiles | 4. | Human urine |
Subtopic: Growth Hormones & Auxin |
76%
From NCERT
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NEET 2025 - Target Batch
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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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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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NEET 2025 - Target Batch
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NEET 2025 - Target Batch
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: Growth Hormones & Auxin |
74%
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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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NEET 2025 - Target Batch
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NEET 2025 - Target Batch
Auxins:
I: promote flowering in tomatoes.
II: induce parthenocarpy in pineapples.
I: promote flowering in tomatoes.
II: induce parthenocarpy in pineapples.
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Growth Hormones & Auxin |
64%
From NCERT
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