UPSC Science and Technology

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🔘Nitrogen-Fixing Bacteria : Behaviors Similar To Organelles In News Researchers have discovered nitrogen-fixing symbiotic organisms exhibiting behaviors similar to organelles. About Nitrogen-fixing bacteria are prokaryotic microorganisms that are capable of transforming nitrogen gas from the atmosphere into “fixed nitrogen” compounds, such as ammonia, that are usable by plants. There are two main types of nitrogen-fixing bacteria. ▪️Symbiotic or mutualistic: These species live in root nodules of certain plants. Plants of the pea family, known as legumes which are some of the most important hosts for nitrogen-fixing bacteria. ▪️ Examples: Rhizobium, which is associated with plants in the pea family and various Azospirillum species, which are associated with cereal grasses. ▪️Other nitrogen-fixing bacteria are free-living and do not require a host. They are commonly found in soil or in aquatic environments. Examples: Cyanobacteria Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia and Clostridium. ▪️Nitrogen is a component of proteins and nucleic acids and is essential to life on Earth. ▪️Although nitrogen is abundant in the atmosphere, most organisms cannot use it in that form. ▪️Nitrogen-fixing bacteria accomplish more than 90 percent of all nitrogen fixation and thus play an important role in the nitrogen cycle.

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🔘Kármán line ▪️Boundary separating Earth's atmosphere and outer space. ▪️The line is neither sharp nor well defined but is often taken to encircle Earth at an altitude between 80 to 100 km above mean sea level. Earth's atmosphere.