1.

Which of the following is a nitrogen fixer?(A) Ulothrix(C) UlvaByAnabaena(D) HydrodictyonLichens are used:(A) In controlling air pollution(B) In re - vegetation of wastelands(C) As indicators of geo - resources such as gold and copper(D) As bio indicators for monitoring air and water pollution

Answer» <p>1. option B Anabaena is a genus of filamentous cyanobacteria that exist as plankton. They are known for nitrogen-fixing abilities, and they form symbiotic relationships with certain plants, such as the mosquito fern.</p><p>2. option B </p>


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