Give two differences between the internal structure of dicot and monocot stem w.r.t. hypodermis and vascular bundle.

olution:

Character	Dicotyledonous Stem	Monocotyledonous Stem
1. Hypodermis	Composed of collenchymatous cells (thin-walled, with angular thickening at corners)	Composed of sclerenchymatous cells (thick-walled, lignified, dead at maturity)
2. Vascular Bundles	Arranged in a ring-like manner around the centrally located pith (eustele arrangement)	Scattered in the ground tissue without any particular arrangement (atactostele)

Additional Contrasts:

Hypodermis Functional Differences:

• Dicot (Collenchyma): Provides flexible support to young stems; allows elongation
• Monocot (Sclerenchyma): Provides rigid support; prevents herbivory

Vascular Bundle Organization:

• Dicot:Conjoint, open (with cambium), endarch protoxylem
• Monocot:Conjoint, closed (no cambium), surrounded by sclerenchymatous bundle sheath

Evolutionary Perspective: The atactostele (scattered bundles) in monocots is considered an advanced feature evolved from the eustele (ring arrangement) in dicots.