What is the number of correct statements from those given below?
I: | Primary xylem is endarch in roots |
II: | Phloem parenchyma is present in most of the monocots. |
III: | Phloem fibers are generally absent in the primary phloem. |
IV: | Companion cells are collenchymatous cells. |
V: | Angiosperms lack vessels in their xylem. |
1. 0
2. 1
3. 2
4. 3
Statement I: | Parenchyma cells are loosely packed and have large intercellular spaces. |
Statement II: | Collenchyma cells are thin-walled and primarily serve to transport nutrients. |
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 |
Assertion (A): | Vessels are particularly advantageous in environments where rapid water transport is needed, such as in tall trees or in plants growing in warm, sunny environments. |
Reason (R): | Tracheids are less efficient in conducting water due to their smaller diameter and the absence of large openings (perforations) at their ends. |
1. | Both (A) and (R) are True and (R) correctly explains (A) |
2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
3. | (A) is True, (R) is False |
4. | (A) is False, (R) is True |
1. | They are elongated cells with thickened lignified cell walls. |
2. | They are dead cells that provide structural support. |
3. | They are elongated cells with unevenly thickened non-lignified cell walls. |
4. | They contain chloroplasts and primarily function in storage. |
Which of the following cell type of vascular tissue system of plants is not correctly matched with its function?
Cell type | Function | |
1. | Tracheid | Chief water conduction element in gymnosperms |
2. | Vessel element | Chief water conduction element in angiosperms |
3. | Sieve cell | Food conduction element in angiosperms |
4. | Albuminous cell | Delivery of substances to sieve cells |
Assertion (A): | Grasses can regenerate parts lost due to grazing herbivores. |
Reason (R): | Grasses have secondary meristems like intercalary meristem. |
1. | Both (A) and (R) are True and (R) explains (A) |
2. | Both (A) and (R) are True but (R) does not explain (A) |
3. | (A) is True but (R) is False |
4. | (A) is False but (R) is True |
Gymnosperms are also called softwood spermatophytes because they lack:
1. Cambium
2. Phloem fibres
3. Thick-walled tracheids
4. Xylem fibres
Tracheids differ from the tracheary elements in:
1. Having casparian strips
2. Being imperforate
3. Lacking nucleus
4. Being lignified
1. | Parenchyma | 2. | Collenchyma |
3. | Sclerenchyma | 4. | Sclereid |