Leaves

Leaves (/'li:vz/)

Leaves (singular: leaf) are the primary photosynthetic organs of plants. They are crucial for the process of photosynthesis, which is the method by which plants convert light energy, usually from the sun, into chemical energy.

Etymology

The word "leaf" is derived from the Old English "lēaf", which is akin to the Old High German "loub" meaning foliage.

Structure

Leaves are typically flat and thin, which allows for the penetration of light. They consist of the stoma, epidermis, mesophyll, and vascular tissues.

Stomata

The stoma are tiny openings or pores that are used for gas exchange. They are mostly found on the underside of a leaf.

Epidermis

The epidermis is the outer layer of cells covering the leaf. It is coated with a waxy cuticle which reduces water loss.

Mesophyll

The mesophyll is the inner part of the leaf where most photosynthesis takes place.

Vascular Tissues

The vascular tissues are the complex conducting tissue, formed of more than one cell type, responsible for carrying water, nutrients, and sugars to and from the leaf.

Function

The primary function of leaves is to produce food for the plant by photosynthesis. They also help in the process of transpiration, a type of evaporation of water from plant leaves.

Related Terms

• Photosynthesis
• Transpiration
• Stomata
• Epidermis
• Mesophyll
• Vascular tissue

External links

• Medical encyclopedia article on Leaves
• Wikipedia's article - Leaves

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