A) biofertilizer
B) food
C) medicines
D) sewage disposal
Correct Answer: A
Solution :
Biofertilizers are organisms which increase the soil fertility. Blue green algae (cyanobacteria) especially Anabaena increase the fertility of soil by fixing atmospheric nitrogen. Some other important nitrogen fixing blue green algae are Oscillatoria, Nostoc etc. Anabaena forms symbiotic association with Azolla and some fungi. Many algae have been used traditionally as food, due to presence of protein and vitamins- porphyra (soups, salads), Chlorella (protein), Ulva, Sargassum, Laminaria are commonly used as food. An antibiotic chlorellin is extracted from a green alga Chlorella.
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