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Q. No.A transverse section of a plant part shows the following features:
I:
Innermost layer of cortex has casparian strips.
II:
Pericycle has parenchymatous cells.
III:
Radially arranged two to four xylem and phloem patches.
This transverse section must be of:
1. Dicot root
2. Monocot root
3. Dicot stem
4. Monocot stem
1. Dicot root
2. Monocot root
3. Dicot stem
4. Monocot stem
Subtopic: Anatomy of Root |
85%
From NCERT
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Identify the incorrect statement regarding guard cells in the epidermal tissue system?
| 1. | They enclose stomata. |
| 2. | They are bean shaped in grasses. |
| 3. | The outer walls are thin and the inner walls are highly thickened. |
| 4. | They possess chloroplasts. |
Subtopic: Epidermal Tissue System |
83%
From NCERT
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Which of the following statements about cork cambium is/are correct?
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| 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. |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Activity of Cork Cambium |
67%
From NCERT
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Identify the incorrect statement.
| 1. | Sapwood is involved in conduction of water and minerals from root to leafs. |
| 2. | Sapwood is the innermost secondary xylem and is lighter in colour |
| 3. | Due to deposition of tannins, resins, oils etc., heart wood is dark in colour. |
| 4. | Heart wood does not conduct water but gives mechanical support. |
Subtopic: Types of Wood (OLD NCERT) |
87%
From NCERT
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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 |
81%
From NCERT
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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 |
58%
From NCERT
NEET - 2023
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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 |
Subtopic: Types of Wood (OLD NCERT) |
63%
From NCERT
NEET - 2023
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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%
From NCERT
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 |
73%
From NCERT
NEET - 2023
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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 |
From NCERT
NEET - 2023
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