Transition of exarch bundles of root to endarch bundles of stem occurs in:
1.  Epicotyl
2.  Hypocotyl
3.  Apical bud
4.  Coleoptile

Vessels are found in:
 

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