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Q. No.Which of the following statements about cork cambium is/are correct?
I:
It usually develops in the cortex region and is a couple of layers thick.
II:
It cuts off cells on both sides where the inner cells differentiate into cork and the outer cells differentiate into secondary cortex.
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Activity of Cork Cambium |
62%
Level 2: 60%+
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Identify the correctly matched pairs regarding anatomy of a dicot root:
1. Only II and III
2. Only I, II and III
3. Only I, III and IV
4. Only II, III and IV
| I: | Epiblema | Many of the cells of epiblema protrude in the form of unicellular root hairs. |
| II: | Endodermis | The tangential as well as radial walls of the cells have a deposition of suberin in the form of casparian strips. |
| III: | Pericycle | Initiation of lateral roots and vascular cambium during the secondary growth takes place in these cells |
| IV: | Pith | Large and well developed. |
2. Only I, II and III
3. Only I, III and IV
4. Only II, III and IV
Subtopic: Anatomy of Root |
82%
Level 1: 80%+
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Give below are two statements :
In the light of the above statements, choose the correct answer from the options given below:
1. Statement I is incorrect but Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct but Statement II is incorrect.
| Statement I: | Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body. |
| Statement II: | Exarch condition is the most common feature of the root system. |
In the light of the above statements, choose the correct answer from the options given below:
1. Statement I is incorrect but Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct but Statement II is incorrect.
Subtopic: Dicot Stem |
59%
Level 3: 35%-60%
NEET - 2023
Hints
Give below are two statements : One is labelled as Assertion (A) and The other is labelled as Reason (R) :
In the light of the above statements, choose the correct answer from the option given below :
| Assertion (A): | Late wood has fewer xylary elements with narrow vessels. |
| Reason (R): | Cambium is less active in winters. |
| 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
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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%+
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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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