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Q. No.
Given below are two statements:
Assertion (A):
A continuous cambial ring is formed in dicot stem during secondary growth
Reason (R):
In dicot stem, the cells of medullary rays, adjoining interfascicular cambium become meristematic and forms intrafascicular cambium
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.
Subtopic: Activity of Vascular Cambium (OLD NCERT) | Activity of Cork Cambium |
55%
From NCERT
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Given below are two statements:
| Assertion (A): | Trichomes are epidermal hairs on the stem |
| Reason (R): | Trichomes are always unicellular |
| 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. |
Subtopic: Epidermal Tissue System |
78%
From NCERT
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Given below are two statements:
| Assertion (A): | A typical dicot stem produces more wood in comparison to bast |
| Reason (R): | -Cambium is generally more active on the inner side than that of the outer side |
| 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. |
Subtopic: Activity of Cork Cambium |
66%
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Given below are two statements:
| Assertion (A): | Interfascicular cambium is formed as a result of de-differentiation |
| Reason (R): | Interfascicular cambium is developed from primary meristems due to structural and functional changes |
| 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. |
Subtopic: Activity of Vascular Cambium (OLD NCERT) |
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Given below are two statements:
| Assertion (A): | Companion cells help in maintaining a proper pressure gradient in sieve tubes |
| Reason (R): | Nuclei of companion cells control the activities of sieve tubes |
| 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. |
Subtopic: Complex Tissue: Phloem |
From NCERT
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Given below are two statements:
| Assertion (A): | Lateral meristem is a secondary meristem |
| Reason (R): | Primary meristems appear early in plant life and contribute to the formation of the primary plant body |
| 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. |
Subtopic: Meristematic Tissue:Classification (OLD NCERT) |
88%
From NCERT
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Given below are two statements:
| Assertion (A): | Phloem fibres or bast fibres are made up of collenchymatous cells |
| Reason (R): | Phloem fibres are generally found in primary phloem |
| 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. |
Subtopic: Complex Tissue: Phloem |
79%
From NCERT
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Given below are two statements:
| Assertion (A): | Intercalary meristem occurs between mature tissues |
| Reason (R): | Intercalary meristem helps in the elongation of the organ |
| 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. |
Subtopic: Meristematic Tissue:Classification (OLD NCERT) |
From NCERT
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Given below are two statements:
| Assertion (A): | In angiosperms, transport of food and water is more efficient than gymnosperms and pteridophytes |
| Reason (R): | In angiosperms longitudinally arranged sieve tube elements and vessels with perforated end walls are present |
| 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. |
Subtopic: Complex Tissue: Xylem | Complex Tissue: Phloem |
82%
From NCERT
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Given below are two statements:
| Assertion (A): | In woody stems, the amount of heartwood continues to increase year after year |
| Reason (R): | The tracheary elements of heartwood are plugged y depositions of various organic substances |
| 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. |
Subtopic: Types of Wood (OLD NCERT) |
52%
From NCERT
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