Integrins are involved in biological activities, includes: 

Extravasation

Cell-to-cell adhesion

Cell migration

Receptors for certain viruses

Angiogenesis

Apoptosis

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Hierarchy of classification Groups 

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A.W. Eichler classified the plant kingdom into two sub-kingdoms; Cryptogamae and Phanerogamae

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Thallophyta

Largest group of plant kingdom.

not differentiated into stem, leaves and roots and no distinctive tissue systems.

mostly aquatic plants and found both in fresh and marine water due to absent of "true roots" and vascular tissue.

cell wall composed of cellulose around their cells.

Ex- Algae, Fungi and Lichens

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Algae

Chlorophyll bearing thallophytes

Autotrophic mode of Nutrition

Ex- Chlorella, Chlamydomonas, Cladospora, Sargassum, Gelidium, Laminaria

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Algae

Largest producer of Carbohydrates 

some forms edible like Ulva (sea lettuce)