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
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