The small heart-shaped gametophyte called a prothallus is part of the life cycle of the

mosses

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ferns

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liverworts

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gnetophytes

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Solution

The correct option is D ferns
The gametophyte of ferns and other pteridophytes is known as the prothallus. It is one cell thick, usually heart or kidney shaped and does not have roots, stems or leaves, but it does have rhizoids that anchor it to the soil and help with absorption. Both female (archegonium) and male (antheridium) sex organs are present in the prothallus.
So, the correct option is 'ferns'.

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Comment on the life cycle and nature of a fern prothallus.

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