Biological classification part-6 By Khushboo Gupta
This course will be helpful for- All pre-medical examination NEET JIPMER AllMS and all state level exams. All students of class 11th and 12th cbse and rbse Useful for all biological Olympiads.
About myself- 2nd year Medical student At Dr. S.n. Medical college, Jodhpur 3rd topper of GPC RUHS Please follow review recommend enrol And not to forget to give upvote to my course!!!! All the
Kingdom animalia It is characterized by heterotrophic eukaryotic organisms, multicellular and lack of cell walls. They directly or indirectly depends on plants for food. They digest their food in an internal cavity and store food reserve as glycogen or fat. Their mode of nutrition is holozoic by ingestof food They follow a definite growth pattern and grow into adults that have a definite shape and size. Higher forms shows elaborate sensory and neuromotor mechanism Most of them are capable of locomotion. The sexual reproduction is by copulation of male and female followed by embryonic development.
Viruses Viruses did not find a place in classification since they are not truly"living". Viruses are non cellular organisms that are characterized by having an inert crystalline structure outside the living cell Once they infect a cell they take over the machinery of the host cell to replicate themselves, killing the host. History of discovery of viruses: The name virus means venom fluid was given by Pasteur. D.J. Ivanowsky (1892) M.W. Beijerinek (1898) demonstrate that the extract of the infected plants of tobacco could causes infection in healthy plant and called the fluid as Contagium vivum fluidium. W.M Stanley (1935) showed that viruses could have crystallized and crystalline consists largely of proteins. Bacteriophage - have double stranded DNA VIRUSES Structure of virus. the protein coat called capsid made of small subunits called capsomeres, protect the nuclei acid. Capsomeres are arranged in helical or polyhedral geometric forms Economic importance of viruses- they causes disease like mumps, small pox, herpes and influenza. AIDS in humans caused by virus. In plants, the symptoms can be mosaic formation, leaf rolling and curting, yellowing and vein clearing, dwarfing and stunted growth
Viriods In 1971, . . Diener discovered a new infectious agents that was smaller than viruses and caused potato spindle Tuber disease. It was found to be a free RNA It lacked of the protein coat that is Found in viruses, hence they name as viriods. The RNA of the vinods have low molecular weight.
Lichens Lichens are symbiotic association, l.e. Mutually useful associations, b/w algae and fungi The algal components is knows as phycobiont The fungal components is knows as mycobiont which are autotrophi and heterotrophic. Algae prepare food for fungi and fungi provide shelter and absorb mineral nutrient for its partner. Lichens are very good pollution indicators-they do not grow in polluted areas.
Clearing concepts and doubts is what I do!!!📍 Enjoy learning!!!🎀 ❌Impossible ➡️work hard with smartness➡️possible✔️ 3rd year Medical student