Internal Structure of Monocot Leaf Notes | Free Biology Notes

This article we will discuss about Internal Structure of monocot leaf

The transverse section of a monocot leaf reveals the following structures

Epidermis

• A monocot leaf is generally isobilateral leaf
• It has upper and lower epidermis

I) Upper epidermis

• Outermost layer present on the upper side of the leaf
• Made up of a single layer of parenchymatous
• Cuticle layer is present on the upper epidermis
• Stomata is present on both upper and lower epidermis
• Some parenchymatous cells on the upper epidermis are large and thin-walled are known as bulliform cells
• Bulliform cells make the leaves curl during water stress and helps to reduce water loss

II) Lower epidermis

• Outermost layer present on the lower side of the leaf
• Single layer, parenchymatous & covered with cuticle
• Number of stomata is equal on both the epidermis
• Stomata is surrounded by dumb bell shaped guard cells
• Function of epidermis: protective layer, exchange of gases and facilitates the transpiration

Mesophyll tissue

• Present between the upper and lower epidermis, there is an entire mass of ground tissue called mesophyll
• Unlike dicot leaf, no differentiation is observed in the mesophyll as palisade and spongy parenchyma
• The cells are made up of parenchyma and are irregularly arranged with intercellular spaces
• These cells contain chloroplasts and can take part in the process of photosynthesis

Vascular bundle

• A large number of vascular bundles are present
• Each vascular bundle consists of xylem and phloem
• Vascular tissues are surrounded by a sheath of cells made up of parenchyma called bundle sheath
• Vascular bundle is conjoint, collateral and closed
• Functions of V.B: conduct water and food materials