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Q. No.Consider the following tissues in the stellar region of a stem showing secondary growth.
(A) Primary xylem
(B) Secondary xylem
(C) Primary phloem
(D) Secondary phloem
Arrange these in the correct sequence of their position from pith towards cortex.
1.
(A), (B), (D), (C)
2.
(B), (A), (C), (D)
3.
(A), (B), (C), (D)
4.
(B), (A), (D), (C)
Subtopic: Dicot Stem |
Level 3: 35%-60%
NEET - 2023
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Consider the following plant tissues:
(A) Axillary buds
(B) Fascicular vascular cambium
(C) Interfascicular cambium
(D) Cork cambium
(E) Intercalary meristem
Identify the lateral meristems among the above:
(A) Axillary buds
(B) Fascicular vascular cambium
(C) Interfascicular cambium
(D) Cork cambium
(E) Intercalary meristem
Identify the lateral meristems among the above:
| 1. | (A), (C) and (D) only | 2. | (B), (C) and (D) only |
| 3. | (A), (B), (C) and (E) only | 4. | (A), (B), (D) and (E) only |
83%
Level 1: 80%+
NEET - 2023
Hints
Given below are two statements:
| Assertion (A): | Both apical and intercalary meristems are primary meristems |
| Reason (R): | Apical and intercalary meristem appear early in life and contribute to the formation of 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. |
88%
Level 1: 80%+
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Given below are two statements:
| Assertion (A): | Vascular bundles in dicot stem, possess the ability to form secondary xylem and phloem tissues |
| Reason (R): | In dicotyledonous stems, cambium is present between xylem and 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: Vascular Tissue System |
88%
Level 1: 80%+
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Given below are two statements:
| Assertion (A): | In the monocotyledons, the vascular bundles lack cambium |
| Reason (R): | Monocots show secondary growth in their stems and roots |
| 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 |
83%
Level 1: 80%+
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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 Cork Cambium |
53%
Level 3: 35%-60%
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Given below are two statements:
| Assertion (A): | Trichomes are epidermal hair 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 |
79%
Level 2: 60%+
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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 |
68%
Level 2: 60%+
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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. |
Level 3: 35%-60%
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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 |
Level 3: 35%-60%
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