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Regarding cyanobacteria choose the right statement:

( a ) photosynthetic autotrophs - have chlorophyll a and b similar to green plants, multicellular, colonial, freshwater/marine or terrestrial algae, gelatinous sheath surrounding the colonies, often form blooms in polluted water bodies, can fix atmospheric nitrogen in specialised cells called heterocysts
( b ) photosynthetic autotrophs - have chlorophyll a and b similar to green plants, unicellular, colonial or filamentous, freshwater/marine or terrestrial algae, gelatinous sheath surrounding the colonies, can fix atmospheric nitrogen in specialised cells called heterocysts
( c ) photosynthetic autotrophs - have chlorophyll b similar to green plants, unicellular, colonial never filamentous, freshwater/marine or terrestrial algae, gelatinous sheath surrounding the colonies, often form blooms in polluted water bodies, can fix atmospheric nitrogen in specialised cells called heterocysts
( d ) photosynthetic autotrophs - have chlorophyll a, , unicellular, colonial or filamentous, freshwater/marine or terrestrial algae, gelatinous sheath surrounding the colonies, can fix atmospheric nitrogen in heterocysts
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(D) is the right answer.

The cyanobacteria (also referred to as blue-green algae) have chlorophyll a similar to green plants and are photosynthetic autotrophs. The cyanobacteria are unicellular, colonial or filamentous, freshwater/marine or terrestrial algae. The colonies are generally surrounded by gelatinous sheath. They often form blooms in polluted water bodies. Some of these organisms can fix atmospheric nitrogen in specialised cells called heterocysts, e.g., Nostoc and Anabaena.
answered Jan 3, 2014 by pady_1
 

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