Question

How do the blue–green algae and symbiotic bacteria
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Answer 1

Answer:

Blue-green algae and symbiotic bacteria both convert free nitrogen into nitrogenous compounds such as ammonia, nitrate, nitrites with the help of enzyme nitrogenase. ... They fix atmospheric nitrogen into products which can be used by the plants. In return, they get food from plants in the form of sugar.

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Answer 2

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$<font color=blue> The cell envelope of blue‐green algae bears a superficial resemblance to the cell wall of bacteria, particularly to the Gram‐positive organisms. Like bacteria, blue‐green algae also possess a mucopeptide component as an important part of the cell wall. However, the composition of this mucopeptide component resembles more closely that of Gram‐negative bacteria, though more species of blue‐green algae need examination before the relationship can be established with any certainty. </font>$

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