A) Chromatium
B) Cosmarium
C) Chlorobium
D) Clostridium
Correct Answer: B
Solution :
Cosmarium is a single-celled placoderm desmid. The cells are deeply divided in the middle by a short isthmus that contains the nucleus. The two semicells are rounded in front view and flattened, oral or eliptical in side view. Each semicell has at least one central chloroplast (usually 2 or 4) with pyrenoids.
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