Bacteria frequently deploy a “quorum‐sensing” mechanism to facilitate successful colonization of plant tissue

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Algae

They exist as-

Microscopic Unicellular- Chlamydomonas

Colonial Forms- Volvox 

filamentous forms- Ulothrix and Spirogyra

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Reproduction

Vegetative reproduction-   by fragmentation

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Reproduction

Asexual reproduction-  by spore formation (zoospores)

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Reproduction

sexual reproduction-  by fusion of two gametes

Isogamous (Spirogyra), Anisogamous (Chlamydomonas) or Oogamous (Volvox).

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Algae are divided into three main classes;

Chlorophyceae  (Green Algae)

Phaeophyceae  (Brown Algae)

Rhodophyceae  (Red Algae)

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