What is the difference between Thallus and Prothallus?

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Thallus:

1. When the plant body is not differentiated into root, stem and leaves, it is called thallus. It is found in algae.

2. It is a gametophyte but reproduces both asexually and sexually.

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3. Specialised sex organs, such as antheridium and archegonium are not formed.

4. Gametes are mostly biflagelleted.

5. It may be unicellular or multicellular.

Prothallus:

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1. It is a small, thallus-like green, flat and heart-shaped structure found in ferns.

2. It is a gametophyte and reproduces only sexually.

3. Prothallus contains antheridium and archegonium.

4. Gametes are multiflagllated.

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5. It is multicellular.

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