Give below are two statements :
 
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 true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is correct but Statement II is false.
Subtopic:  Dicot Stem |
 57%
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) :
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
Subtopic:  Types of Wood (OLD NCERT) |
 64%
From NCERT
NEET - 2023
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Identify the correct statements:
 
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.

Choose the correct answer from the options given below:
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 |
 70%
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 |
 72%
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.
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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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:
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
Subtopic:  Meristematic Tissue:Classification (OLD NCERT) |
 84%
From NCERT
NEET - 2023
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Read the following statements about the vascular bundles:
 
a. In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii.
b. Conjoint closed vascular bundles do not possess cambium.
c. In open vascular bundles, cambium is present in between xylem and phloem.
d. The vascular bundles of dicotyledonous stem possess endarch protoxylem.
e. In monocotyledonous root, usually there are more than six xylem bundles present.

Choose the correct answer from the options given below:
1. (a), (c), (d) and (e) only
2. (a), (b) and (d) only
3. (b), (c), (d) and (e) only
4. all statements are correct
Subtopic:  Vascular Tissue System |
 55%
From NCERT
NEET - 2022
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In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to :

a. secretion of secondary metabolites and their deposition in the lumen of vessels.
b. deposition of organic compounds like tannins and resins in the central layers of stem.
c. deposition of suberin and aromatic substances in the outer layer of stem.
d. deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem.
e. presence of parenchyma cells, functionally active xylem elements and essential oils.


Choose the correct answer from the options given below
1. (b) and (d) Only
2. (a) and (b) Only
3. (c) and (d) Only
4. (d) and (e) Only

Subtopic:  Types of Wood (OLD NCERT) |
 58%
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NEET - 2022
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The anatomy of springwood shows some peculiar features. Identify the correct set of statements about springwood.

a. It is also called as the early wood.
b. In spring season cambium produces xylem elements with narrow vessels.
c. It is lighter in colour.
d. The springwood along with autumn wood shows alternate concentric rings forming annual rings.
e. It has lower density.


Choose the correct answer from the options given below:
1. (c), (d) and (e) Only
2. (a), (b), (d) and (e) Only
3. (a), (c), (d) and (e)Only
4. (a), (b) and (d) Only

Subtopic:  Types of Wood (OLD NCERT) |
 82%
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NEET - 2022
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Axillary buds are derived from the activity of : 
1. Lateral meristem 
2. Secondary meristem 
3. Apical meristem 
4. Intercalary meristem

Subtopic:  Meristematic Tissue: Shoot Apex (OLD NCERT) |
 80%
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