This document compares the leaf anatomy of dicots and monocots. Dicot leaves have a dorsiventral orientation with stomata on the upper epidermis. Their mesophyll is differentiated into palisade and spongy parenchyma, and their vascular bundles are surrounded by bundle sheath cells made of collenchyma. Monocot leaves have an isobilateral orientation with stomata on both epidermis. Their mesophyll is not differentiated and contains bulliform cells that control leaf curling. Their vascular bundles are surrounded by sclerenchyma bundle sheath cells.

1. DICOT AND MONOCOT LEAF
ANATOMY

2. MORPHOLOGY

3. Dicotyledonous leaf
• Typical dorsiventral leaf
• T.S of leaf lamina show three main parts
Epidermis
Mesophyll
Vascular system

5. Epidermis
• It covers both upper(adaxial epidermis) and
lower surface(abaxial)
• Cuticle is present
• Upper epidermis consist stomata

6. MESOPHYLL
• Tissues between upper and lower epidermis
• It posses chloroplast –photosynthesis
• Two type- palisade parenchyma, spongy
parenchyma

7. • Palisade parenchyma
• Adaxially placed
• Elongated cells
• Vertically arranged and parallel to each other

8. • Mesophyll parenchyma
• Oval or round
• Loosely arranged
• Below the palisade cells
• Air cavities present

9. VASCULAR SYSTEM
• It seen in the veins and mid ribs
• Size of vascular bundle depend on the size of
the vein
• It is surrounded by a thick walled bundle
sheath cells

11. MONOCOTYLEDONOUS LEAF
• Typical isobilateral leaf
• Three main parts
Epidermis
Mesophyll
Vascular system

13. • Stomata present on both epidermis
• Mesophyll is not differentiated in to palisade
and spongy parenchyma
• Bulliform cells- modified adaxial epidermis
cells and veins
• It absorb water and become turgid-leaf
surface exposed
• It become flaccid due to water stress-leaves
curl inward

16. characters Dicot leaf Monocot leaf
Nature of orientation Dorsi ventral isobilateral
stomata Upper epidermis Both upper and lower
mesophyll Palisade and spongy
parenchyma
Spongy parenchyma
Bundle sheath Made up of collenchyma made up of sclerenchyma