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Q. No.Give below are two statements : One is labelled as Assertion (A) and The other is labelled as Reason (R) :
Assertion (A):
Late wood has fewer xylary elements with narrow vessels.
Reason (R):
Cambium is less active in winters.
In the light of the above statements, choose the correct answer from the option given below :
1.
(A) is False but (R) is True.
2.
Both (A) and (R) are True and (R) is the correct explanation of (A).
3.
Both (A) and (R) are True but (R) is not the correct explanation of (A).
4.
(A) is True but (R) is False
63%
Level 2: 60%+
NEET - 2023
Hints
Identify the correct statements:
Choose the correct answer from the options given below:
| A: | Lenticels are the lens-shaped openings permitting the exchange of gases. |
| B: | Bark formed early in the season is called hard bark. |
| C: | Bark is a technical term that refers to all tissues exterior to vascular cambium. |
| D: | Bark refers to periderm and secondary phloem. |
| E: | Phellogen is single- layered in thickness. |
| 1. | B and C only | 2. | B, C and E only |
| 3. | A and D only | 4. | A, B and D only |
Subtopic: Activity of Cork Cambium |
69%
Level 2: 60%+
NEET - 2023
Hints
The transverse section of plant part showed polyarch, radial and exarch xylem, with endodermis and pericycle. The plant part is identified as:
| 1. | Monocot root | 2. | Dicot root |
| 3. | Dicot stem | 4. | Monocot stem |
Subtopic: Anatomy of Root |
75%
Level 2: 60%+
NEET - 2023
Hints
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.
(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
Hints
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%+
Please attempt this question first.
Hints
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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 |
54%
Level 3: 35%-60%
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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 |
79%
Level 2: 60%+
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