EVERYDAY SCIENCE

Detailed explanation-1: -Typically there are three orders of lower-order veins, known as ‘major veins’, often ribbed with sclerenchyma (Esau, 1977). One or more first-order veins run from the petiole to the leaf apex, with second-order veins branching at intervals, and third-order veins branching between.

Detailed explanation-2: -The arrangement of veins in a leaf is called the venation pattern; monocots have parallel venation, while dicots have reticulate venation. The arrangement of leaves on a stem is known as phyllotaxy; leaves can be classified as either alternate, spiral, opposite, or whorled.

Detailed explanation-3: -The arrangement of veins in the lamina is called venation.

Detailed explanation-4: -The arrangement of veins and veinlets on the lamina of a leaf is called venation. There are two types of venation, reticulate and parallel venation.

Detailed explanation-5: -Three major venation patterns in simple leaves are “palmate”, “pinnate”, or “parallel” (Figure 17, left to right). Typically there is a prominent central vein (the midrib) running from the leaf base to its tip.