Q. No.| COLUMN I [PGR] |
COLUMN II [Discovered by] |
||
| A | Auxin | P | F. W. Went |
| B | Gibberellic acid | Q | E. Kurosawa |
| C | Kinetin | R | Miller et al. |
| D | Ethylene | S | H. H, Cousins |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | P | S | R |
| 3. | R | S | Q | P |
| 4. | S | R | P | Q |
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How does pruning help in making the hedge dense?
| 1. | It induces the differentiation of new shoots from the rootstock |
| 2. | It frees axillary buds from apical dominance |
| 3. | The apical shoots grow faster after pruning |
| 4. | It releases wound hormones |
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There are certain seeds that fail to germinate even when external conditions are favourable. Some of the chemical inhibitors present in such seeds can be all of the following except:
| 1. | Abscisic acids | 2. | Phenolic acid |
| 3. | Para-ascorbic acid | 4. | Gibberellic acid |
Which of the following is not a use of plant PGR ethylene?
| 1. | Initiation of flowering and synchronizing fruit set in pineapples. |
| 2. | Induction of flowering in mango. |
| 3. | Ethephon, most common source of ethylene, hastens fruit ripening in tomatoes. |
| 4. | Induction of parthenocarpy in tomatoes. |
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| Column I | Column II | ||
| A. | Auxins | P. | Terpenes |
| B. | Gibberellins | Q. | Derivatives of carotenoids |
| C. | Cytokinins | R. | Adenine derivative |
| D. | Abscisic acid | S. | Indole compounds |
| A | B | C | D | |
| 1. | S | P | R | Q |
| 2. | P | Q | S | R |
| 3. | Q | R | P | S |
| 4. | R | S | Q | P |
The ratio of cytokinins to auxin controls cell differentiation in a callus, if:
| I. | Auxin levels increase shoot buds develop from the callus |
| II. | Cytokinins level increase, roots form |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Identify the plant growth regulator that is not correctly matched to its chemical nature in the following given options:
|
|
PGR |
Chemical nature |
|
1. |
Ethylene |
Gaseous |
|
2. |
Adenine derivatives |
Kinetin |
|
3. |
Indole compounds |
Auxins |
|
4. |
Terpenes |
Abscisic acid |
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| 1. | Breaking seed and bud dormancy |
| 2. | Horizontal growth of seedlings, swelling of axis and apical hook formation in dicot seedlings |
| 3. | Enhancement of respiration rate during ripening of fruits |
| 4. | Closure of stomata during water stress |
When compared to their normal sized counterparts, the dwarf mutant varieties of a plant generally produce less:
| 1. | Auxins | 2. | Gibberellins |
| 3. | Ethylene | 4. | ABA |
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