CBSE Class 12 Biology Respiration Notes
Breathing & Exchange of Gases Introduction • It is a process of oxidation of organic compounds in cell in which energy is released. • According to scientist G.S. Carter, there are 3 steps in respiration : 1.1 External respiration :…
CBSE Class 12 Biology Sexual Reproduction In Flowering Plants Minds Map
Important Questions for NCERT Class 12 Biology Sexual Reproduction in Flowering Plants Ques. The role of double fertilisation in angiosperms is to produce (a) cotyledons (b) endocarp (c) endosperm (d) integuments. Answer: C Ques. Double fertilisation is…
CBSE Class 12 Biology Principles Of Inheritance And Variation Minds Map
Important Questions for NCERT Class 12 Biology Principles of Inheritance and Variation Ques. What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia and is sterile?(a) Down’s syndrome(b) Turner’s syndrome(c) Klinefelter’s…
CBSE Class 12 Biology Molecular Basis Of Inheritance Minds Map
Important Questions for NCERT Class 12 Biology Molecular Basis of Inheritance Ques. What would happen if in a gene encoding a polypeptide of 50 amino acids, 25th codon (UAU) is mutated to UAA ? (a) A polypeptide of 24 amino acids will be formed. (b) Two…
CBSE Class 12 Biology Evolution Minds Map
Important Questions for NCERT Class 12 Biology Evolution Ques. Convergent evolution is illustrated by (a) rat and dog (b) bacterium and protozoan (c) starfish and cuttle fish (d) dogfish and whale. Answer: D Ques. Industrial…
CBSE Class 12 Biology Parthenogenesis Notes
PARTHENOGENESIS (VIRGIN REPRODUCTION OR VIRGIN BIRTH) Parthenogenesis is the development of an egg into offspring without fertilization. Occurance: It is very common in Rotifers, Aphids, Bees and crustacean. Some vertebrates also reproduced by parthenogenesis. Types:…
CBSE Class 12 Biology Study Guide For All Chapters
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CBSE Class 12 Biology Principles Of Inheritance And Variation Notes
Genetics: Genetics is a branch of biology which deals with principles of inheritance and its practices. Heredity: It is transmission of traits from one generation to another through the molecular mechanism. Variation: Variation is the degree by which progeny differ from…
CBSE Class 12 Biology Other Chapters Notes And Questions
Chapter-15: BIODIVERSITY AND CONSERVATION IMPORTANT SCIENTISTS AND THEIR CONTRIBUTION Biodiversity is defined as the totality of genes, species and ecosystems of a given region, It is the variety and variability of life form (all animals, plants and microbes on earth)…
CBSE Class 12 Biology Organisms And Populations Notes
ORGANISMS AND POPULATIONS Ecology: It is a branch of biology which studies the interactions i) among organisms and ii) between the organism and its physical ( abiotic) environment. Organism: Individual of a species. Population: Population is a group of individuals…
CBSE Class 12 Biology Microbes In Human Welfare Notes
Chapter – 10: Microbes in Human Welfare Microbes are present everywhere. E.g. Thermal vents of geyser (Temp. above 1000 C) Deep in soil. Under snow. Diverse. Protozoa, Bacteria, Fungi, Virus, Viroids, Prions (Proteinaceous infectious agents) Useful : Antibiotics…