Write short notes on:
1. Blue green algae
2. Nitrogen fixation
3. Diatoms.
Answers
☆BLUE GREEN ALGAE:-
➡Cyanobacteria the blue green algae bacteria (formerly called blue green algae) a subgroup of the kingdom procaryotea , unicellular or filamentous photographic organism that uses the water as an electron donor and produce oxygen in the presence of light.
examples:- , Nostocales, Chroococcales, Oscillatorials, Prpchlorophta, Synechoococcales.
Treatment of a surface water that is experiencing a blue-green algae bloom with an herbicide or algaecide may kill the blue-green algae, but any toxin(s) contained in the cells will be released at once, resulting in a slug of toxin(s) in the water.
☆Nitrogen fixation:-
➡
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nitrogen cycleNitrogen fixation is the process by which atmospheric nitrogen is converted by either a natural or an industrial means to a form of nitrogen such as ammonia. In nature, most nitrogen is harvested from the atmosphere by microorganisms to form ammonia, nitrites, and nitrates that can be used by plants.
The two types of nitrogen fixation are: (1) Physical Nitrogen Fixation and (2) Biological Nitrogen Fixation. Apart from carbon, hydrogen and oxygen, nitrogen is the most prevalent essential macro-element in living organisms.
Biological nitrogen fixation (BNF) occurs when atmospheric nitrogen is converted to ammonia by an enzyme called nitrogenase. ... Many nitrogen-fixing organisms exist only in anaerobic conditions, respiring to draw down oxygen levels, or binding the oxygen with proteins.
☆Diatoms:-
➡diatom is a photosynthetic, single celled organism which means they manufacture their own food in the same way plants do. They are a major group of algae and form one of the most common forms of phytoplankton and join the myriad of organisms that drift on currents in the upper layers of the ocean and lakes.