Which of the following is classified as multicellular green algae?
1.spirogyra
2.ulva
3.chlamydomonas
4.none of the above

The correct answer option 2. Ulva.

Explanation:

Ulva is a flat green multicellular alga growing from a discoid holdfast.  The membrane of the Ulva is 2 cells thin, translucent, and soft and grows attached with or without small disc-shaped holdfast.

The chloroplast is cup-shaped in some cases but a parietal plate in others with 1 to 3 pyrenoids in number. There are some Ulva species that are similar and difficult to differentiate.

Thus, the correct answer is option 2. Ulva.

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