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Q. No.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) |
87%
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 |
77%
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 |
81%
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) |
50%
From NCERT
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Given below are two statements:
| Assertion (A): | Vascular cambium is considered as lateral meristem |
| Reason (R): | It gives rise to lateral roots and shoots |
| 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): | Long distance flow of photosynthates in plants occurs through sieve tubes |
| Reason (R): | A mature sieve tube has peripheral layer of cytoplasm without any nucleus |
| 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 |
58%
From NCERT
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Given below are two statements:
| Assertion (A): | Cork prevents the loss of water by evaporation |
| Reason (R): | Cork cells are dead cells |
| 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 |
54%
From NCERT
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How many of the following are primary meristems and secondary meristems respectively?
(a) Apical meristem
(b) Intercalary meristem
(c) Interfascicular cambium
(d) Intrafascicular cambium
(e) Cork cambium
1. (b) and (c)
2. (a) and (d)
3. (c) and (b)
4. (d) and (a)
(a) Apical meristem
(b) Intercalary meristem
(c) Interfascicular cambium
(d) Intrafascicular cambium
(e) Cork cambium
1. (b) and (c)
2. (a) and (d)
3. (c) and (b)
4. (d) and (a)
Subtopic: Meristematic Tissue:Classification (OLD NCERT) |
From NCERT
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