Four radial vascular bundles are formed in
1. monocot root
2. dicot root
3. monocot stem
4. dicot stem

Vessels are found in
1. All angiosperms
2. Most angiosperms, few gymnosperms and few pteridophytes
3. All angiosperms and few gymnosperms
4. Most angiosperms and few gymnosperms

Which of the following is true about tracheids and vessels
1. Tracheids are multicellular with narrow lumen
2. Tracheids are unicellular with wide lumen
3. Vessels are multicellular with wide lumen
4. Vessels are unicellular with narrow lumen

The cells of the quiescent center are characterized by
1. having dense cytoplasm and prominent nuclei
2. having light cytoplasm and small nuclei
3. dividing regularly to add to the corpus
4. dividing regularly to add to tunica

Common feature in vessel elements and sieve tube elements is

Secondary growth is best observed in
1. Teak and Pine
2. Deodar and Fern
3. Wheat and maiden Hair Fern
4. Sugarcane and Sunflower

Passage cells are thin walled cells found in
1. Phloem elements to serve as entry points
2. Testa of seeds for emergence of embryonal axis
3. Central area of style for passage of pollen tube
4. Endodermis of roots to facilitate rapid transport of water from cortex to pericycle

The length of different internodes in a culm of sugarcane is variable because of
1. Size of leaf lamina at the node below each internode
2. Intercalary meristem
3. Shoot apical meristem
4. Position of axillary buds

Vascular tissue in flowering plants develops from
1. Dermatogen
2. Plerome
3. Periblem
4. Phellogen

The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is