A) filamentous alga with flagellated reproductive stages
B) non-motile colonial alga lacking zoospores
C) filamentous alga lacking flagellated reproductive stages
D) membranous alga producing zoospores
Correct Answer: A
Solution :
Ulothrix is a fresh water, filamentous green alga, found in rather cold flowing water. Sexual reproduction in Ulothrix is isogamous type, ie, it takes place between two morphological similar motile, flagellated male and female gametes which come from different filaments.
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