Question

choose the coorect answer
The correct statement about cyanobacteria ( blue green algae)
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Answer 1

Answer:

Two kinds of nitrogen-fixing bacteria are recognized. The first kind, the free-living (nonsymbiotic) bacteria, includes the cyanobacteria (or blue-green algae) Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium. The second kind, symbiotic bacteria that live in the roots of plants. Bacteria in the genera Clostridium and Azotobacter are non-symbiotic nitrogen-fixing bacteria, while those in the genus Rhizobium are symbiotic bacteria.

So, the correct option is, 'Blue-green algae are not important for nitrogen fixation'.

Answer 2

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 fresh-water marine or terrestrial algae. The colonies are generally surrounded by a gelatinous sheath. They often form blooms in polluted water bodies. Some of these organisms can fix atmospheric nitrogen in specialized cells called heterocysts, e.g Nostoc and Anabaena.

So the correct option is "All of these".

Explanation:

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