What are the structures on the underside of fronds called in which the spores of ferns are produced?

the answer is frond, took the test and it was right

preservation because he preserves part of the land and preserves means save

explanation:

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.