NEET JEE BIOLOGY CBSE CHEMISTRY

➪ Vector & Scalars Short Notes

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❤️SOME TERMS RELATED TO EVOLUTION❤️ 💠Adaptation: 🔶Changing to fit a niche or survive in an environment 💠Anatomy: 🔶Study of the structures of organisms 💠Artificial Selection: 🔶Characteristics selected by humans 💠Biogeography: 🔶Study of how species are distributed across the Earth 💠Biological Species: 🔶Individuals that can interbreed and produce viable offspring 💠Catastrophism: 🔶Changes in species that happen because of quick and often violent natural phenomena 💠Cladistics: 🔶Method of classifying species in groups based on ancestral relationships 💠Cladogram: 🔶Diagram of how species are related 💠Coevolution: 🔶One species changing in response to changes in another species that it interacts with, particularly predator/prey relationships 💠Creationism: 🔶Belief that a higher power created all life 💠Darwinism: 🔶Term commonly used as a synonym for evolution 💠Descent With Modification: 🔶Passing down traits that might change over time 💠Directional Selection: 🔶Type of natural selection in which an extreme characteristic is favored 💠Disruptive Selection: 🔶Type of natural selection that favors both extremes and selects against the average characteristics 💠Embryology: 🔶Study of the earliest stages of development of an organism 💠Endosymbiotic Theory: 🔶Currently accepted theory as to how cells evolved 💠Eukaryote: 🔶Organism made of cells that have membrane-bound organelles 💠Evolution: 🔶Change in populations over time 💠Fossil Record: 🔶All known traces of past life ever found 💠Fundamental Niche: 🔶All available roles an individual can play in an ecosystem 💠Genetics: 🔶Study of traits and how they are passed down from generation to generation 💠Gradualism: 🔶Changes in species that happen over long periods of time 💠Habitat: 🔶Area in which an organism lives 💠Homologous Structures: 🔶Body parts on different species that are similar and most likely evolved from a common ancestor 💠Hydrothermal Vents: 🔶Very hot areas in the ocean where primitive life might have begun 💠Intelligent Design: 🔶Belief that a higher power created life and its changes 💠Macroevolution: 🔶Changes in populations at the species level, including ancestral relationships 💠Mass Extinction: 🔶Event in which large numbers of species died out completely 💠Microevolution: 🔶Changes in species at a molecular or gene level.....

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✅Very important points - Human Reproduction 🌟Uterus also called womb. 🌟 Longest unstripped muscles of the body are found in the walls of uterus. (During pregnancy) 🌟 Clitoris is a homologous to the penis in the male. 🌟 Bartholin Glands : It is homologous to Cowper's gland of male 🌟 A functional mammary gland is characteristic of all female mammals. 🌟 The milk produced during the initial few days of lactation is called colostrum which contains antibodies (IgA) absolutely essential to develop resistance for the new-born babies. ⚡️ Liberation of sperms from Sertoli cells of seminiferous tubules is called spermiation. ⚡️ Liberation of sperms from testes is called semination. ⚡️ Liberation of sperms from body of male is called ejaculation . ⚡️ Mammalian sperms are transfered to vagina of female by the process called insemination. ⚡️ In 1 ml of semen, 20 to 120 millions of sperms are present in human being. ⚡️ Leydig's cells mature at 10 yrs. of age. ⚡️ In humans (and most vertebrates), the first polar body does not undergo meiosis II. ⚡️ The first polar body is, therefore, formed merely to get rid of unwanted chromosomes. ⚡️ 65-74 days are required to complete the cycle of spermatogenesis in human being. @neet_jee_biology_cbse_chemistry

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