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Q. No.Read the following statements with respect to interstellar secondary growth in dicot stems:
(i)
Autumn wood and spring wood appear as alternate concentric rings and constitute an annual ring.
(ii)
Late wood possesses vessels of narrow diameter relative to early wood.
(iii)
Annual rings seen in cut stems give an estimate of the age of the tree and this method is called a dendrogram.
(iv)
Cambium is more active during the spring season than the 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:
Choose the correct option:
| Statement A | Annual rings can be distinctly observed in plants growing in temperate regions |
| Statement B | In temperate regions, the climatic conditions are not uniform throughout the year |
| 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 Statement A and B are correct but statement B is not the correct explanation of Statement A |
| 4. | Both the Statement A and B are incorrect |
Subtopic: Activity of Cork Cambium |
75%
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Match the columns:
1. A = (ii), B = (iii), C =(i), D = (iv)
2. A = (iii), B = (ii), C =(i), D = (iv)
3. A = (iv), B = (iii), C =(i), D = (ii)
4. A = (iii), B = (iv), C =(ii), D = (i)
| Column-I | Column-II | ||
| A. | Bean shaped guard cell | (i) | Dicot stem |
| B. | Dumb-bell shaped guard cell | (ii) | Monocot leaf |
| C. | Trichome | (iii) | Dicot leaf |
| D. | Exarch xylem | (iv) | Dicot and monocot root |
1. A = (ii), B = (iii), C =(i), D = (iv)
2. A = (iii), B = (ii), C =(i), D = (iv)
3. A = (iv), B = (iii), C =(i), D = (ii)
4. A = (iii), B = (iv), C =(ii), D = (i)
Subtopic: Epidermal Tissue System |
84%
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Read the following statements:
How many of the above statements are correct?
1. One
2. Two
3. Four
4. Five
| (i) | Epidermal cells have a 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:
How many of the above statements are correct?
1. Three
2. Two
3. One
4. Four
| (i) | The sieve tube elements and companion cells are connected by pit fields present between their common longitudinal walls. |
| (ii) | Pholem parenchyma is made of elongated non-tapering cylindrical cells which have scanty cytoplasm. |
| (iii) | Pholem fibres are made of parenchymatous cells. |
| (iv) | Companion cells help in maintaining the pressure gradient in the sieve tube. |
| (v) | The phloem parenchyma stores food material and other substances like resins, latex, and mucilage |
How many of the above statements are correct?
1. Three
2. Two
3. One
4. Four
Subtopic: Complex Tissue: Phloem |
61%
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Read the following statements:
How many the above statements are correct?
1. Four
2. Six
3. Two
4. Three
| (i) | The first formed primary xylem elements are called protoxylem and the later formed primary xylem is called metaxylem |
| (ii) | Primary xylem is endarch in stems |
| (iii) | Primary xylem is exarch is roots |
| (iv) | Phloem transports food materials, usually from leaves to other plants parts |
| (v) | Vessel members are interconnected through perforations in their common walls |
| (vi) | Tracheids are elongated or tube like cells with thick, lignified walls and tapering cells |
How many the above statements are correct?
1. Four
2. Six
3. Two
4. Three
Subtopic: Complex Tissue: Xylem |
85%
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| Assertion(A): | The vascular bundles of dicot stems are called open vascular bundles. |
| Reason(R): | Dicot stems can make secondary xylem and secondary phloem with the help of cambium. |
| 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: Vascular Tissue System |
82%
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| Assertion(A): | Monocotyledonous stems do not possess the ability to form secondary xylem and phloem tissues. |
| Reason(R): | In monocotyledonous stems, cambium is not present. |
| 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: Vascular Tissue System |
93%
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| Assertion(A): | Dicotyledonous stems possess the ability to form secondary xylem and phloem tissues. |
| Reason(R): | In dicotyledonous stems, cambium is present between pericycle and xylem. |
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: Dicot Stem |
67%
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| Assertion(A): | Monocotyledonous stems do not possess the ability to form secondary xylem and phloem tissues. |
| Reason(R): | In monocotyledonous stems, cambium is present. |
| 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: Vascular Tissue System |
87%
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