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Q. No.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 |
56%
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%
From NCERT
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%
From NCERT
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%
From NCERT
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 |
63%
From NCERT
NEET - 2022
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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%
From NCERT
NEET - 2022
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One important difference between the anatomy of roots and the anatomy of leaves is that
1. only leaves have phloem and only roots have xylem.
2. root cells have cell walls and leaf cells do not.
3. a waxy cuticle covers leaves but is absent from roots.
4. vascular tissue is found in roots but is absent from leaves
1. only leaves have phloem and only roots have xylem.
2. root cells have cell walls and leaf cells do not.
3. a waxy cuticle covers leaves but is absent from roots.
4. vascular tissue is found in roots but is absent from leaves
Subtopic: Anatomy of Root | Dicot Leaf | Monocot Leaf |
88%
From NCERT
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Which of the following is incorrectly paired with its structure and function?
1. sclerenchyma supporting cells with thick secondary walls
2. periderm protective coat of woody stems and roots
3. pericycle waterproof ring of cells surrounding the central stele in roots
4. mesophyll parenchyma cells functioning in photosynthesis in leaves
1. sclerenchyma supporting cells with thick secondary walls
2. periderm protective coat of woody stems and roots
3. pericycle waterproof ring of cells surrounding the central stele in roots
4. mesophyll parenchyma cells functioning in photosynthesis in leaves
Subtopic: Anatomy of Root |
59%
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Hints
| A: | Long-distance flow of photoassimilates in plants occurs through sieve tubes. |
| R: | Mature sieve tubes have parietal cytoplasm and perforated sieve plates. |
| 1. | If both Assertion & Reason are true and the reason is the correct explanation of the assertion. |
| 2. | If both Assertion & Reason are true but the reason is not the correct explanation of the assertion. |
| 3. | If the Assertion is a true statement but the Reason is false. |
| 4. | If both Assertion and Reason are false statements. |
Subtopic: Complex Tissue: Phloem |
51%
From NCERT
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Which of the following have unevenly thickened primary walls that support young, growing parts of the plant?
1. parenchyma cells
2. collenchyma cells
3. sclerenchyma cells
4. tracheids and vessel elements
1. parenchyma cells
2. collenchyma cells
3. sclerenchyma cells
4. tracheids and vessel elements
Subtopic: Simple Tissue: Chollenchyma & Sclerenchyma |
87%
From NCERT
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