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Q. No.Which of the following statements are correct for sap wood?
(i) It does not help in water conduction
(ii) It is light coloured
(iii) It is also called alburnum
(iv) Its tracheary elements are filled with tannins, resins, oils, gums aromatic compounds, and essential oils
(v) It is hard and durable
1. (ii), (iii)
2. (i), (ii), (iii)
3. (iv), (v)
4. (iii), (iv), (v)
Subtopic: Activity of Secondary Xylem (OLD NCERT) |
85%
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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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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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NEET - 2022
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Read the following statements with respect to the secondary growth in dicot stems:
How many of the above statements are correct?
1. Three
2. Two
3. Four
4. One
| (i) | The cambium is generally more active on the inner side than on the outer side. |
| (ii) | The cells which are cut off towards pith by cambium mature into secondary phloem and cells cut off towards periphery mature into secondary xylem. |
| (iii) | The amount of secondary xylem produced is more than secondary phloem. |
| (iv) | The primary and secondary phloems get gradually crushed due to the continued formation and accumulation of secondary xylem. |
| (v) | The primary xylem also gets crushed and rarely remains intact. |
How many of the above statements are correct?
1. Three
2. Two
3. Four
4. One
Subtopic: Activity of Secondary Xylem (OLD NCERT) |
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Read the following statements:
How many of the above statements are correct?
1. Three
2. Four
3. Two
4. Five
| (i) | Meristematic tissue is made of immature cells |
| (ii) | A common structural feature of vessel elements and sieve tube is an enucleate condition |
| (iii) | Root cap in monocots is formed by calyptrogen |
| (iv) | All xylem elements are dead at maturity |
| (v) | Collenchyma is a dead mechanical tissue |
How many of the above statements are correct?
1. Three
2. Four
3. Two
4. Five
Subtopic: Meristematic Tissue:Classification (OLD NCERT) |
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Interfascicular cambium is present between:
1. Primary xylem and primary phloem
2. Pericycle and endodermis
3. Two vascular bundles
4. Secondary xylem and secondary phloem
1. Primary xylem and primary phloem
2. Pericycle and endodermis
3. Two vascular bundles
4. Secondary xylem and secondary phloem
Subtopic: Secondary Growth in Root (OLD NCERT) |
50%
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Meristematic tissue responsible for the increase in girth of a tree trunk is:
1. Intercalary meristem
2. Lateral meristem
3. Phellogen
4. Apical meristem
1. Intercalary meristem
2. Lateral meristem
3. Phellogen
4. Apical meristem
Subtopic: Meristematic Tissue:Classification (OLD NCERT) |
80%
From NCERT
NEET - 2013
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Assertion(A): Both apical meristems and intercalary meristems appear early in life of a plant and contribute to the formation of the primary plant body.
Reason(R): Both apical meristems and intercalary meristems are primary meristems.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
Reason(R): Both apical meristems and intercalary meristems are primary meristems.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
Subtopic: Meristematic Tissue:Classification (OLD NCERT) | Meristematic Tissue: Shoot Apex (OLD NCERT) | Meristematic Tissue: Root Apex (OLD NCERT) |
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Assertion(A): The meristematic tissue called cork cambium or phellogen develops in the cortex region of monocot stems.
Reason(R): The activity of vascular cambium causes the shedding of cortical and epidermis layers in the dicot stem.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
Reason(R): The activity of vascular cambium causes the shedding of cortical and epidermis layers in the dicot stem.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.
Subtopic: Activity of Vascular Cambium (OLD NCERT) | Activity of Cork Cambium |
70%
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