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 |
Codes:
| 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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