The second part of Darwin’s hypothesis is that exaggerated secondary sexual traits decrease survival.

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Algae

Largest producer of Carbohydrates 

some forms edible like Ulva (sea lettuce)

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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)