PRACTICAL :- STUDY OF LEAF MORPHOLOGY.
Leaf morphology is the study of the structure, form, and adaptations of leaves,
which are essential organs in most plants. Leaves play vital roles in
photosynthesis, respiration, transpiration, storage, defence, and can be
modified for specific functions depending on the plant’s environment. By
Parts of a Leaf
Generally, leaf base, petiole, and lamina, together form the main parts of a
leaf.
I) Leaf Base: This is the part where a leaf attaches to the stem. Leaf base has
two small leaf-like structure called stipules. In plants like paddy, wheat, and
other monocotyledons, this leaf base is wide and masks the stem.
II) Petiole: Petiole is the long, thin, stalk that links the leaf blade to the stem.
III )Lamina: Also known as leaf blade. It is the green, flat surface of the leaves.
It consists of a small branched vein and veinlets. The vein that runs along the
middle of the lamina is called midrib. Midrib divides the surface of the lamina
into two. These veins and veinlets give rigidity to the leaf blade and help in the
transportation of water and other substances.
, Venation
Venation is defined as the arrangement of veins and the veinlets in the leaves.
Different plants show different types of venation. Generally, there are two
Types of venation :
1) Reticulate venation: In a reticulate venation, the veinlets are randomly
arranged and form a complex network of veinlets. Ex: Dicotyledonous plants
like a rose plant.
2) Parallel venation: In a parallel venation, the veinlets run parallel to each
other. Ex: In monocotyledons like paddy.
Leaf morphology is the study of the structure, form, and adaptations of leaves,
which are essential organs in most plants. Leaves play vital roles in
photosynthesis, respiration, transpiration, storage, defence, and can be
modified for specific functions depending on the plant’s environment. By
Parts of a Leaf
Generally, leaf base, petiole, and lamina, together form the main parts of a
leaf.
I) Leaf Base: This is the part where a leaf attaches to the stem. Leaf base has
two small leaf-like structure called stipules. In plants like paddy, wheat, and
other monocotyledons, this leaf base is wide and masks the stem.
II) Petiole: Petiole is the long, thin, stalk that links the leaf blade to the stem.
III )Lamina: Also known as leaf blade. It is the green, flat surface of the leaves.
It consists of a small branched vein and veinlets. The vein that runs along the
middle of the lamina is called midrib. Midrib divides the surface of the lamina
into two. These veins and veinlets give rigidity to the leaf blade and help in the
transportation of water and other substances.
, Venation
Venation is defined as the arrangement of veins and the veinlets in the leaves.
Different plants show different types of venation. Generally, there are two
Types of venation :
1) Reticulate venation: In a reticulate venation, the veinlets are randomly
arranged and form a complex network of veinlets. Ex: Dicotyledonous plants
like a rose plant.
2) Parallel venation: In a parallel venation, the veinlets run parallel to each
other. Ex: In monocotyledons like paddy.
