- 1(current)
Q. No.| Assertion (A): | Xylem and phloem are not called complex tissues in a plant body. |
| Reason (R): | They are composed of a single type of cell with similar structures and functions. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True and (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Complex Tissue: Xylem | Complex Tissue: Phloem |
88%
From NCERT
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How many of the following statements about plant tissues are correct?
1. One
2. Two
3. Three
4. Four
| I: | Sclerenchyma cells are typically dead and have thickened lignified walls that help in providing structural support. |
| II: | Xylem tissues are primarily involved in the storage of proteins and starch. |
| III: | Phloem tissues are responsible for the transport of water and minerals from the roots to the leaves. |
| IV: | Parenchyma cells are versatile cells that can store food, and are also involved in photosynthesis and repair. |
2. Two
3. Three
4. Four
Subtopic: Simple Tissue: Parenchyma | Simple Tissue: Chollenchyma & Sclerenchyma | Complex Tissue: Xylem | Complex Tissue: Phloem |
83%
From NCERT
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| Statement I: | Phloem fibers (bast fibers) are made up of sclerenchymatous cells and are absent in the primary phloem but are found in the secondary phloem. |
| Statement II: | The phloem parenchyma stores food material and other substances like resins, latex, and mucilage and is absent in most of the monocotyledons. |
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Complex Tissue: Phloem |
86%
From NCERT
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Which of the following is missing in sieve tube elements when they attain maturity?
| 1. | Nuclei | 2. | Cytoplasm |
| 3. | P-protein | 4. | Callose |
Subtopic: Complex Tissue: Phloem |
88%
From NCERT
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Consider the two statements.
1. Only Statement I is correct.
2. Only Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
| Statement I: | Gymnosperms lack albuminous cells and sieve cells. |
| Statement II: | Gymnosperms have sieve tubes and companion cells. |
2. Only Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
Subtopic: Complex Tissue: Xylem | Complex Tissue: Phloem |
79%
From NCERT
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Both sieve tube cells in plants and erythrocytes in humans:
1. lack mitochondria
2. have a non-cellulosic cell wall
3. carry respiratory pigments
4. are characterised by an absence of nucleus
1. lack mitochondria
2. have a non-cellulosic cell wall
3. carry respiratory pigments
4. are characterised by an absence of nucleus
Subtopic: Complex Tissue: Phloem |
93%
From NCERT
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Consider the given two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Monocots have companion cells, dicots do not. |
| II: | Monocots have sieve tubes, while dicots have sieve cells. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Complex Tissue: Xylem | Complex Tissue: Phloem |
83%
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Identify A, B, C and D in the given diagram:
| A | B | C | D | |
| 1. | Sieve pore | Sieve tube element | Phloem Parenchyma | Companion cell |
| 2. | Sieve tube element | Sieve pore | Phloem Parenchyma | Companion cell |
| 3. | Sieve pore | Sieve tube element | Companion cell | Phloem Parenchyma |
| 4. | Sieve tube element | Sieve pore | Companion cell | Phloem Parenchyma |
Subtopic: Complex Tissue: Phloem |
From NCERT
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How many of the given statements are correct?
1. 3
2. 4
3. 5
4. 6
| I: | Gymnosperms have albuminous cells and sieve cells but lack sieve tubes and companion cells |
| II: | The sieve tube elements and companion cells are connected by pit fields present between their common longitudinal walls. |
| III: | Cell walls of phloem parenchyma cells have pits through which plasmodesmatal connections exist between cells. |
| IV: | Phloem parenchyma is absent in most of the monocots. |
| V: | Phloem fibers become dead at maturity. |
| VI: | Phloem fibers are generally absent in primary phloem. |
1. 3
2. 4
3. 5
4. 6
Subtopic: Complex Tissue: Xylem | Complex Tissue: Phloem |
From NCERT
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