What are the two types of epidermis found in leaves of flowering plants?

Solution:

Leaves have two distinct epidermal layers:

1. Adaxial Epidermis (Upper Epidermis)
2. Abaxial Epidermis (Lower Epidermis)

Detailed Comparison:

Feature	Adaxial Epidermis	Abaxial Epidermis
Location	Covers the upper surface (towards axis/stem)	Covers the lower surface (away from axis)
Stomatal Density	Lower (in dorsiventral leaves)	Higher (in dorsiventral leaves)
Isobilateral Leaves	Equal stomatal density on both surfaces	Equal stomatal density on both surfaces
Cuticle Thickness	Often thicker (more sun exposure)	Often thinner
Trichomes	May be present (protective)	May be present (transpiration control)

Leaf Type Variations:

Dorsiventral Leaves (Dicots):

• Example: Mango, peepal
• More stomata on abaxial surface (reduces water loss)
• Differentiated mesophyll (palisade + spongy)

Isobilateral Leaves (Monocots):

• Example: Grasses, maize
• Equal stomata on both surfaces
• Uniform mesophyll (no palisade-spongy differentiation)

Functional Advantage:

• Abaxial stomata reduce water loss (less direct sunlight)
• Adaxial surface maximizes light interception for photosynthesis