Extrastelar secondary growth takes place by:
1. Vascular cambium
2. Phellogen
3. Phellem
4. Phelloderm
The periderm includes:
1. Secondary phloem
2. Cork
3. Cambium
4. All of these
Transition of exarch bundles of root to endarch bundles of stem occurs in:
1. Epicotyl
2. Hypocotyl
3. Apical bud
4. Coleoptile
The main function of lenticel is:
1. Transpiration
2. Guttation
3. Gaseous exchange
4. Bleeding
Vessels are found in:
1. | All angiosperms and some gymnosperm |
2. | Most of the angiosperm and few gymnosperms |
3. | All angiosperms, all gymnosperms, and some Pteridophyta |
4. | All pteridophyta |
Four radial V.B. are found in:
1. Dicot root
2. Monocot root
3. Dicot stem
4. Monocot stem
Which of the following statement is true:
1. Vessels are multicellular and with a wide lumen
2. Tracheids are multicellular and with a narrow lumen
3. Vessels are unicellular and with a narrow lumen
4. Tracheids are unicellular and with a wide lumen