What is meant by Phelm?

Phellum, also known as cork, is a protective tissue that forms the outermost layer of the bark in woody plants. It consists of dead cells that are filled with air, making it lightweight and buoyant. Phellum is produced by a specialized tissue called the phellogen, or cork cambium.

Phellum serves several important functions in plants:

* Protection: Phellum provides a waterproof barrier that protects the inner tissues of the plant from water loss, temperature fluctuations, and mechanical damage.

* Insulation: The air-filled cells of phellum help to insulate the plant from extreme temperatures.

* Buoyancy: Phellum helps to keep the plant afloat in water, which is important for plants that grow in wet habitats.

* Storage: Phellum can store water and nutrients for the plant.

* Guttation: Phellum can also be involved in guttation, which is the process of water droplets being exuded from the plant's leaves.

Phellum is an important tissue that plays a vital role in the survival of woody plants. It is a versatile material that has been used by humans for a variety of purposes, including making wine corks, insulation, and building materials.