There are various types of submerged plants, they may be algae ,
brophytes ,pteridophytes, gymnosperms and angiosperms.
Submerged plants also reproduce like terrestrial ones.
There may be isogamy , anisogamy, oogamy.
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According to SOWPODS (the combination of Scrabble dictionaries
used around the world) there are 1 words with the pattern
A--S-G---. That is, nine letter words with 1st letter A and 4th
letter S and 6th letter G. In alphabetical order, they are:
anisogamy
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Isogamy = It means union of gametes that are identical in all
respect ; so much so that it is not possible to label them as 'male
' and 'female ' gamete '.
Heterogamy or Anisogamy=this case the two uniting gametes are
different from each other some how and therefore can labeled as
male and female. Oogamy == In this case the two uniting gametes are
distinctingly dissimilar and easy to spot as such.