Which feature of some species of blue green algae helps promote them as bio fertilizers ........

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Which feature of some species of blue-green algae helps promote them as bio-fertilizers?

They convert atmospheric methane into ammonia which the crop plants can absorb.

They induce the crop plants to produce the enzymes which help convert atmospheric nitrogen to nitrates

They have the mechanism to convert atmospheric nitrogen into a form that the crop plants can absorb readily

They induce the roots of the crop plants to absorb the soil nitrates in large quantities.

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Explanation:

Algae is an informal term for a large, diverse group of photosynthetic organisms which are not necessarily closely related, and is thus polyphyletic. Included organisms range from unicellular genera, such as Chlorella and the diatoms, to multicellular forms, such as the giant kelp, a large brown alga which may grow up to 50 m in length. Most are aquatic and autotrophic and lack many of the distinct cell and tissue types, such as stomata, xylem, and phloem, which are found in land plants. The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the Charophyta, a division of green algae which includes, for example, Spirogyra and the stoneworts.