Q. No.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
Consider the two statements:
I. Hydroponically grown plants would grow much slower if they were not sufficiently aerated.
II. Oxygen is not soluble in water.
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. Both I and II are incorrect
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 |
Consider the given two statements:
I. Generally, phenotypic plasticity is more important for immobile organisms (e.g. plants) than mobile organisms (e.g. most animals).
II. Plants follow different pathways in response to environment or phases of life to form different kinds of structures.
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. Both I and II are incorrect
Consider the given two statements:
I. 2,4-D [2,4-Dichlorophenoxyacetic acid] is widely used as a herbicide.
II. 2,4-D acts by mimicking the action of the plant growth hormone auxin, which results in uncontrolled growth and eventually death in susceptible plants.
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. Both I and II are incorrect
Match each item in Column I with one in Column II and select the correct match from the codes given:
| COLUMN I | COLUMN II | ||
| A | Auxins | P | Indole compounds |
| B. | Cytokinins | Q | Skoog and Miller |
| C. | Gibberellins | R | Terpenes |
| D. | Ethylene | S | Cousins |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | P | R | S | Q |
| 3. | R | P | Q | S |
| 4. | R | S | P | Q |
| 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 |
| Assertion (A): | Growth, at a cellular level, is measured by a variety of parameters such as increase in fresh weight, dry weight, length, area, volume and cell number. |
| Reason (R): | Such parameters are more or less proportional to the increase in protoplasm which is primarily responsible for growth at cellular level. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
| Assertion (A): | Spraying sugarcane crops with gibberellins increase the yield by as much as 20 tonnes per acre. |
| Reason (R): | Sugarcane stores carbohydrates such as sugar in their stems. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
| Assertion (A): | Shoot apices modify themselves into flowering apices prior to lowering. |
| Reason (R): | Shoot apices are the sites of perception of light/dark in plants. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
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