differentiate monocot and dicot based on external morphology:

1. cortex

2. endodermis (present or absent)

3. Cambium (P or A) in roots

4. arrangement of vascular bundles in roots

5. arrangement of vascular bundles in stems

5. Cambium (P or A) in stems

6. pith (narrow or wide)

7. mesophyll layer

8. bulliform cells (P or A) in leaf