Vascular bundles in monocotyledons are considered closed because:
1. | a bundle sheath surrounds each bundle |
2. | cambium is absent |
3. | there are no vessels with perforations |
4. | xylem is surrounded all around by phloem |
A major characteristic of the monocot root is the presence of:
1. | Scattered vascular bundles |
2. | Vasculature without cambium |
3. | Cambium sandwiched between phloem and xylem along the radius |
4. | Open vascular bundles |
You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?
1. | Secondary xylem | 2. | Secondary phloem |
3. | Protoxylem | 4. | Cortical cells |
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