The fine lines present on the leaf are called ‘leaf veins’
The single middle prominent vein is known as ‘mid rib’ or the primary vein
The veins other than the primary vein are called ‘secondary veins’
The leaf veins consists of vascular bundles that help in the transport of mineral
nutrients and water from the roots to the leaf and the materials produced in the
leaf to the rest of the plant
The pattern of leaf venation is important characteristic for the identification
The veins are present on either side of the mid rib in different fashion
The secondary vein can create other pattern where they may or may not be parallel
to each other
The primary vein can be considered like a ‘tree trunk’ and the secondary vein as
the branches of the tree
Leaf venation is basically of two types
A) Reticulate venation:
In this type, the veins branch and unite forming a complicated network
All the veins are interconnected, like the strands of the net
Leaves of ‘Dicot plants’ generally have reticulate venation
e.g., Hibiscus, Redgram
B) Parallel venation:
In this type, the veins run parallel or nearly parallel to each other and are connected
by smaller veins
Leaves of ‘Monocot plants’ generally have parallel venation
e.g., Banana, Wheat
Questions based on Leaf Venation:
1) What are the functions of the veins in the leaf?
The veins of the leaf consist of the vascular bundles such as xylem and phloem
These vascular bundles help in the transport of the nutrient and water to the leaf
and the materials produced in the leaf to various parts of the plant
Moreover, the pattern in which these veins are arranged is of botanical importance,
as it an important characteristic for the identification of plant.
2) Most of the Dicotyledonous plants have Reticulate venation.
Solution:(a) Generally, most of the Dicotyledonous plants have Reticulate venation
and monocots have parallel venation.