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🚨 HIGH ALERT: Most Repeated NEET Topics (Must Do!)
Methanogens

🔥 Repeated: 2016, 2011, 2022
  • Guts of ruminants
  • Production of biogas from gut of ruminants.
  • Most abundant in cattle yard.
  • Produce gobar gas.
Five-Kingdom System
🔥 Repeated: 2003, 1998
  • In the five-kingdom system of classification, kingdom Monera includes blue-green algae, nitrogen-fixing bacteria, and methanogenic archaebacteria.
Cyanobacteria

🔥 Repeated: 2001, 1996, 1994, 2019
  • Oxygenic with nitrogenase.
  • Also called blue-green algae.
  • Belong to prokaryotes.
  • Temperature tolerance of thermal blue-green algae is due to homopolar bonds in their proteins.
  • Anabaena - fix Nitrogen.
  • Found in aquatic environment.
Diatoms

🔥 Repeated: 2018, 2015
  • Are known as chief producers in the ocean.
  • Cell walls form two thin overlapping shells which fit together (chrysophytes).
Paramecium
🔥 Repeated: 2005, 1990, 1995
  • In Paramecium caudatum, dimorphic nucleus is found.
Protista

🔥 Repeated: 1994
  • Protistan genome has membrane-bound nucleoproteins embedded in cytoplasm.
  • Protists obtain food as synthesisers, symbiots, and holotrophs.
  • Protista includes heterotrophs, chemoheterotrophs, and chemoautotrophs.
African Sleeping Sickness

🔥 Repeated: 1990, 1989
  • Caused due to Trypanosoma gambiense.
  • Transmitted by Glossina palpalis (Tse-Tse fly).
  • It is polymorphic.
  • Trypanosoma belongs to class zooflagellate.
Ergot of Rye
🔥 Repeated: 2007, 1994
  • Ergot of rye is caused by a species of Claviceps.
Prions

🔥 Repeated: 2022, 2006, 2010, 2020
  • Cause Mad cow disease in cattle and Cr-Jacob disease in human.
  • Abnormally folded protein.
  • Infectious protein.
Viruses

🔥 Repeated: 2004, 2014, 2013, 2012, 2010, 2003, 2001, 2000, 1997, 1996, 1994
  • Virus envelope.
  • Viruses that infect bacteria, multiply and cause their lysis, are called lytic.
  • Viruses are no more "alive" than isolated chromosomes because both require the environment of a cell to replicate.
  • Viruses are obligate parasites.
  • Tobacco mosaic virus is a tubular filament of size 300 x 20 nm.
  • Cauliflower mosaic virus contains ds DNA.
  • A virus can be considered a living organism if it reproduces (inside host).
  • Viruses contain either DNA or RNA.
  • Influenza virus - RNA.
  • Tobacco Mosaic Virus (TMV) genes are ss RNA (Coiled).
  • Satellite RNAs are present in some Plant viruses.
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📌 Important Tags: NEET Biology PYQs, Most Repeated Questions in NEET Biology, Kingdom Monera and Protista Notes, Viruses and Prions NEET Important Points, AK Vision Zone Study Material, NEET Quick Revision Notes, Biological Classification Important Questions.