Tracheids differ from the tracheary elements in:
1. | Having casparian strips |
2. | Being imperforate |
3. | Lacking nucleus |
4. | Being lignified |
Lenticels are involved in:
1. | Gaseous exchange | 2. | Food transfer |
3. | Photosynthesis | 4. | Transpiration |
The common bottle cork is a product of:
1. dermatogen
2. phellogen
3. xylem
4. vascular cambium
Companion cells are closely associated with:
1. | Sieve elements | 2. | Vessel elements |
3. | Trichomes | 4. | Guard cells |
Closed vascular bundles lack:
1. Ground tissue
2. Conjuctive tissue
3. Cambium
4. Pith
Water containing cavities in vascular bundles are found in:
1. Sunflower
2. Maize
3. Cycas
4. Pinus
Gymnosperms are also called softwood spermatophytes because they lack:
1. Cambium
2. Phloem fibres
3. Thick-walled tracheids
4. Xylem fibres
1. | all tissues except epidermis and vascular bundles |
2. | epidermis and cortex |
3. | all tissues internal to endodermis |
4. | all tissues external to endodermis |
1. | mitochondria |
2. | endoplasmic reticulum |
3. | chloroplasts |
4. | cytoskeleton |