What are these organisms?

Question

Which are plants/animals?

Which plants float/partially submerged?

Which animals are on the surface/in the water?

- Water moss fern

- water boatman

- arrowhead

-pond skater

Answer 1

The Water Moss Fern(Azolla) do float on the surface, though there roots are under water. It is a plant.

The Water Boatman is an aquatic insect, they swim upside down on the surface of the water.

The Arrowhead (Sagittaria) grow in ponds and are used for aquariums. They can be emerged or float.

And the Pond Skater (Gerridae family) is an aquatic insect as well, they live and walk upon the surfaces of ponds and streams.

Answer 2

1) Pond skater = information link == click on it =

http://en.wikipedia.org/wiki/Gerridae

http://www.dorlingkindersley-uk.co.uk/st...

2 ) Arrowhead = There are three plants sharing that epithet =

http://en.wikipedia.org/wiki/Sagittaria

http://en.wikipedia.org/wiki/Nephthytis

http://en.wikipedia.org/wiki/Syngonium

In my opinion the first one ( Sagittaria ) is the 'Real' Arrowhead!!!!

http://www.swsbm.com/Images/New12-97/Sag...

http://caliban.mpiz-koeln.mpg.de/~stuebe...

3 ) Water boatman==clik the link ==

http://insects.tamu.edu/fieldguide/aimg4...

http://en.wikipedia.org/wiki/Water_boatm...

http://www.scientificillustrator.com/art...

4 ) Fern moss ==There is no water moss fern =Thuidium==

http://www.britannica.com/eb/article-903...

http://bryophytes.plant.siu.edu/thuidium...

http://images.google.co.in/images?um=1&h...

EDIT == Azolla is water fern and NOT water moss fern =

Azolla (mosquito fern, duckweed fern, fairy moss, water fern) is a genus of seven species of aquatic ferns, the only genus in the family Azollaceae. They are extremely reduced in form and specialized, looking nothing like conventional ferns but more resembling duckweed or some mosses.

http://en.wikipedia.org/wiki/Azolla

There are water mosses  , water ferns BUT there is no plant having all three ( Water, Moss and Fern ) together