A) several diatoms and a few cyanobacteria
B) several cyanobacteria and several diatoms
C) some diatoms and several cyanobacteria
D) some cyanobacteria and many diatoms
Correct Answer: B
Solution :
[b] Baciilariophycean members (diatoms) form about 20% of all primary productions. These are microscopic, eukaryotic, unicellular or colonial coccoid algae. These algae are sexually reproduced by the formation of auxospores in most cases. Bozi (1914) and Fremi (1930) reported that short sections of living cells at the tips of the trichomes of Weraeila lanosa become invested by a thick, lamellated, pigmented sheath. Such multicellular spore like structures function as perennating bodies. They are specially modified hormogones and are called hormospores or hormocysts. Desikachary (1946) calls them pseudohormogonia.
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