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The structures that might be found on the underside of fern leaves are spores. The correct answer between all the choices given is the last choice or letter C. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

Answer:

The correct answer would be - spores.

Explanation:

Ferns have special leaves called fronds. Their spores are enclosed in special structures called sporangia, which are dots or clusters that found on the underside of fern fronds.  

The sporangia have spores that are present with caps called indusia until spores reach maturity. Indusia propel the spores from fern plants forcefully when it burst open. If the spores land in a favorable environment they produce second-generation prothalli.

Thus, the correct answer would be spores.

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