"Seba" wrote in message ...
Hi, i'm making a thesis about the fotosyntheses of waterplants. I wonder,
wich plants would be great to start with. Preferable would be plants where
you can easely see the differences in grow, health, shortages of some
elements, ....

Egeria,Hydrillia, Coontail/hornwort, Riccia, Water sprite all make
good subjects for submersed study. Generally, some type of screen it
placed to keep them from any access to the air or surface.

Many/most plants are floating or emergent, only a few are true
submersed plants and these have roots. Mosses do not have true roots,
Riccia has no roots. The mosses may work also.

Regards,
Tom Barr