Question

can anyone plzz tell me the fuction of leaf margin?
i need it tomorrow ​

Answer 1

Answer:

Function of leaf margin:-

The shape of the margin of leaf lamina or leaf blade is dependent on the extent to which the leaf blades are subject to varieties of incisions, cuts or irregularities or completely free from them.

Answer 2

The margin is the edge of the leaf lamina lying between the apex and base. Entire margins are smooth, without indentations or incisions. Revolute margins are rolled downward, toward the lower surface of the leaf.

Involute margins are rolled upward, or toward the upper surface of the leaf. Repand margins are slightly and irregularly wavy, with the lamina surface undulating in a downward and upward direction. Sinuate leaf margins are shallowly indented and strongly wavy in the horizontal plane.

Teeth

“Teeth” are commonly seen in leaf margins and typically extend less than one-eighth of the distance from the margin to the midrib of the leaf. Various shapes and sizes of teeth are associated with leaf margins.

Crenate margins have shallowly ascending round or obtuse teeth. Crenulate (minutely crenate) margins have minute, shallowly ascending round or obtuse teeth. Serrate margins have sharp, saw-toothed teeth pointing forward or toward the apex.

Serrulate (minutely serrate)margins have very fine, sharp, saw-toothed teeth pointing forward or toward the apex. Doubly serrate margins have coarse, saw-toothed teeth bearing smaller teeth on the basipetal part of their edges. Dentate margins have sharp teeth, or indentions, pointing outward at right angles to the midrib.

Denticulate (minutely dentate) margins have fine, sharp teeth, or indentions, pointing outward at right angles to the midrib. Aculeate margins have spiny or prickly projections along their edges. Bristle tips refer to teeth or lobes that are terminated by a sharp, flexible, elongated point.

Glands

Glands are small, protruding bumps on the leaf margin that are typically different in color from the surrounding lamina tissue. Often they occur at the apices of teeth or lobes or on leaf petioles. Use of a hand magnifying lens helps in observing the small glands of some species.