Initiation of lateral roots and vascular cambium during secondary growth takes place in cells of :
1. Epiblema 2. Cortex
3. Endodermis 4. Pericycle

Subtopic:  Anatomy of Root |
 73%
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NEET - 2022
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The type of tissue commonly found in the fruit wall of nuts is :
1. Parenchyma 2. Collenchyma
3. Sclerenchyma 4. Sclereid
Subtopic:  Simple Tissue: Chollenchyma & Sclerenchyma |
 50%
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Which of the following is not a character of collenchyma tissue? 

1. They provide mechanical support to the growing part of the plant 
2. They occur in layers below epidermis in dicotyledonous plants 
3. They consist of cells with thick corners due to cellulose deposition 
4. They are usually dead and without protoplasts

Subtopic:  Simple Tissue: Chollenchyma & Sclerenchyma |
 79%
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NEET - 2022
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Select the correct statements related to the activity of cork cambium: 

1. The outer cells differentiate into phelloderm.
2. The cork differentiated from cork cambium, is impervious to water due to deposition of tannins and resins. 
3. Cuts the cells only on the outer side.
4. Cuts the cells on inner as well as outer side.

Subtopic:  Activity of Cork Cambium |
 64%
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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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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 |
 53%
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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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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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