[sapta]

is volvox unicellular or multicellular?Give reasons.

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Is this the 1st Biology question asked here?

[Corvettaholic]

I don't know what volvox is, but I do now! With the wonders of google I found this:

http://www.btinternet.com/~stephen.durr/volvox.html

hopefully it'll answer your question with reasons. Looks multicellular to me.

[Donaldson Tan]

isn't Volvox is a conglomeration of green algae colonies

[savoy7]

Green algae that lives in colonies

each algal cell has 2 flagella and are connected to the other cells in the colony.  

Most biologists I know would consider Volvox it be an unicellular organism that survives in a colony.  It is about as close to a multicellular organism one can get.

By the way, one of my favorite organisms to view using dark field microscopy.

[constant thinker]

Corvettaholic you always have some of the best posts. Yea I'd say that a volvox was multi-cellular because it is a colony of aglae. I studied these in 5th grade. It was boring to watch little green blobs under a microscope. They move slowly too which was annoying.