Q. No.| Assertion (A): | Ethylene helps the plants to increase their absorption surface. |
| Reason (R) : | It promotes root growth and root hair formation. |
| 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 statements |
A : Breaking of seed dormancy by giving cold treatment to seedling in presence of air is vernalisation.
B : Vernalisation increases vegetative growth period to bring early flowering.
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark(1).
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
3. If Assertion is true statement but reason is false, then mark (3).
4. If both Assertion and Reason are false statements, then mark (4).
| Assertion (A): | Ethephon hastens fruit ripening in tomatoes. |
| Reason (R): | Ethephon releases ethylene readily. |
Choices for Assertions and reasons:
| 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): | In coriander, the leaves of juvenile plants are different in shape from those in mature plants. |
| Reason (R): | It shows environmental plasticity. |
| 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) : Promotion of flowering by a period of low temperature is called vernalisation.
Reason (R) : Vernalisation prevents precocious reproductive development.
1. Both (A) and reason are true and (R) is the correct explanation of (A)
2. Both (A) assertion 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 statements
| Assertion(A): | 2,4-D is widely used as an herbicide. |
| Reason(R): | It is used to kill mature monocotyledonous plants. |
| 1. | Both (A) & (R) are true and (R) is the correct explanation of (A) |
| 2. | Both (A) & (R) are true but (R) is not the correct explanation of (A) |
| 3. | (A) is a true statement but (R) is false. |
| 4. | Both (A) and (R) are false statements. |
Two leaves with respective growth are depicted below.
Consider A' and B' or final size after growth. Which of following statement explain the above situation appropriately :-
| 1. | Relative growth rate of A is twice as that of B relative growth rate |
| 2. | Absolute growth rate is same in A and B |
| 3. | Absolute growth rate of B is 1/10 of A absoulate growth rate |
| 4. | Relative growth rate of B is same as A relative growth |
Consider the following statements:
| I. | In low concentrations, auxin can inhibit ethylene formation and transport of precursor in plants; |
| II. | High concentrations of auxin can induce the synthesis of ethylene. |
| III. | Therefore, the high concentration can induce maleness of flowers in some species. |
The correct statements are:
1. I, II, III
2. I, II
3. I, III
4. II, III
Consider the following statements regarding the synthesis and distribution of auxins:
| I. | Auxins are made continuously in the shoot apex and young leaves |
| II. | It moves away from the tip and its movement is described as basipetal and polar |
| III. |
It moves by active transport from cell to cell and is eventually inactivated and degraded by enzymes |
| IV. |
Long term transport can also occur via the vascular system (mainly phloem) from shoots to roots |
| V. | No auxin is made by roots |
The correct statements are:
1. I, II, III
2. I, II, IV
3. II, III, 2
4. III, IV, 34
Consider the following statements regarding a certain plant growth regulator:
| I. | They are a class of plant growth substances that promote cell division. |
| II. | They are primarily involved in cell growth, differentiation, and other physiological processes. |
| III. | Their effects were first discovered through the use of coconut milk by Folke Skoog. |
This plant hormone must be:
1. Auxin
2. Cytokinin
3. Giberrellin
4. Ethylene
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