A: Secondary growth is absent in monocots

R: Monocots lack vascular cambium.

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 Assertion is a true statement but the reason is false.

4. If both Assertion and Reason are false statements.

Subtopic:  Monocot Stem |
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A: Phellogen is a secondary meristem that form cork on the outer side and secondary cortex on the inner side.

R: Phellogen is formed every year from hypodermis and pericycle in dicot root and dicot stem respectively.

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 Assertion is a true statement but the reason is false.

4. If both Assertion and Reason are false statements.

Subtopic:  Activity of Cork Cambium |
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A: Amount of secondary xylem produced is more than the secondary phloem in the dicot stem.

R: Cambium is generally more active on the inner side than on the outer.

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 Assertion is a true statement but the reason is false.

4. If both Assertion and Reason are false statements.

Subtopic:  Activity of Vascular Cambium | Activity of Secondary Xylem |
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A: The secondary xylem is derived from procambium during secondary growth.

R: The amount of secondary xylem is almost equal to the amount of secondary phloem.

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 Assertion is a true statement but the reason is false.

4. If both Assertion and Reason are false statements.

Subtopic:  Activity of Secondary Xylem |
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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 |
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Read the following statements: 
A- Annual rings can be distinctly observed in plants growing in temperate regions 
B- In temperate regions, the climatic conditions are not uniform throughout the year 
Choose the correct option: 
1. Statement A is correct but statement B is wrong 
2. Both the statement A and B are correct and statement B is the correct explanation of statement A 
3. Both the statements A and B are correct but statement B is not the correct explanation of statement A 
4. Both the statements A and B are incorrect
Subtopic:  Activity of Cork Cambium |
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Read the following statements w.r.t. intrastelar secondary growth in dicot stems: 
(i) Autumn wood and spring wood appear as alternate concentric rings and constitute an annual ring 
(ii) Late wood possess vessels of narrow diameter relative to early wood 
(iii) Annual rings seen in cut stem give an estimate of the age of the tree and this method is called dendrogram 
(iv) Cambium is more active during spring season than winter season 
(v) Growth rings or annual rings are very prominent in the trees growing near sea-shores? 
How many of the above statements are correct? 
1. Three 
2.  Four 
3.  Five 
4.  Two 
 
Subtopic:  Activity of Cork Cambium |
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Read the following statements w.r.t the secondary growth in dicot stems: 
(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 rarelly remains intact? 
How many of the above statements are correct? 
1. Three
2. Two 
3. Four 
4. One 
Subtopic:  Activity of Secondary Xylem |
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Read the following statements: 
(i) Epidermal cells have lower number of chloroplasts or lack them completely, except for the guard cells 
(ii) Epidermis is mostly single layered except in the leaves of Ficus and Peperomia 
(iii) Epidermis lack intercellular spaces 
(iv) Root epidermis lack cuticle 
(v) In plants with secondary growth, the epidermis of roots and stems is usually replaced by a periderm through the action of cork cambium or phellogen 
How many of the above statements are correct? 
1. One 
2.  Two 
3. Four 
4. Five 
Subtopic:  Epidermal Tissue System |
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Read the following statements: 
(i) Meristematic tissue is made of immature cells 
(ii) A common structural feature of vessel elements and sieve tube is 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 |
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