Q. No.Heart wood differs from sapwood in
1. Absence of vessels and parenchyma
2. Having dead and non-conducting elements
3. Being susceptible to pests and pathogens
4. Presence of rays and fibres
1. Absence of vessels and parenchyma
2. Having dead and non-conducting elements
3. Being susceptible to pests and pathogens
4. Presence of rays and fibres
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Which one of the following is not a lateral meristem
1. Interfascicular cambium
2. Phellogen
3. Intercalary meristem
4. Intrafascicular cambium
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In land plants, the guard cells differ from other epidermal cells in having
1. Cytoskeleton
2. Mitochondria
3. Endoplasmic reticulum
4.Chloroplasts
The cork cambium, cork and secondary cortex are collectively called
| 1. | Phelloderm | 2. | Phellogen |
| 3. | Periderm | 4. | Phellem |
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Some vascular bundles are described as open because these
| 1. | are surrounded by pericycle but no endodermis |
| 2. | are capable of producing secondary xylem and phloem |
| 3. | possess conjunctive tissue between xylem and phloem |
| 4. | are not surrounded by pericycle |
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Companion cells are closely associated with
1. Sieve elements
2. Vessel elements
3. Trichomes
4. Guard cells
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Water containing cavities in vascular bundles are found in
| 1. Sunflower | 2. Maize |
| 3. Cycas | 4. Pinus |
Gymnosperms are also called soft wood spermatophytes because they lack
1. Cambium
2. Phloem fibres
3. Thick-walled tracheids
4. Xylem fibres
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