STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION Enhancement in Food Production – Animal Husbandry, Plant Breeding, Single Cell Proteins and Tissue Culture (NCERT 12TH BIOLOGY) With ever -increasing population of the world, enhancement of food production is a major necessity. Biological principles as applied to animal husbandry and plant breeding have a major role in our …
BIOLOGY IN HUMAN WELFARE Biology in Human Welfare – Common Diseases in Humans, Immunity, AIDS, Cancer and Drug and Alcohol Abuse (NCERT 12TH BIOLOGY) Health, for a long time, was considered as a state of body and mind where there was a balance of certain ‘humors’. This is what early Greeks like Hippocrates as well …
EVOLUTION EVOLUTION – Origin of Life, Evolution of Life Forms – A Theory, Evidences for Evolution, Adaptive Radiation, Biological Evolution, Mechanism of Evolution, Hardy-Weinberg Principle and Origin and Evolution of Man (NCERT 12TH BIOLOGY) Evolutionary Biology is the study of history of life forms on earth. What exactly is evolution? To understand the changes in …
PROKARYOTIC CELLS The prokaryotic cells are represented by bacteria, blue-green algae, mycoplasma and PPLO (Pleuro Pneumonia Like Organisms). They are generally smaller and multiply more rapidly than the eukaryotic cells.They may vary greatly in shape and size. The four basic shapes of bacteria are bacillus (rod like), coccus (spherical), vibrio (comma shaped) and spirillum (spiral). …
EUKARYOTIC CELLS The eukaryotes include all the protists, plants, animals and fungi. In eukaryotic cells there is an extensive compartmentalisation of cytoplasm through the presence of membrane bound organelles. Eukaryotic cells possess an organised nucleus with a nuclear envelope. In addition,eukaryotic cells have a variety of complex locomotory and cytoskeletal structures. Their genetic material is …
CELL: THE UNIT OF LIFE WHAT IS A CELL? Unicellular organisms are capable of (i) independent existence and (ii) performing the essential functions of life. Anything less than a complete structure of a cell does not ensure independent living. Hence, cell is the fundamental structural and functional unit of all living organisms. Anton Von Leeuwenhoek …
CELL: STRUCTURE AND FUNCTIONS Biology is the study of living organisms. The detailed description of their form and appearance only brought out their diversity. It is the cell theory that emphasised the unity underlying this diversity of forms, i.e., the cellular organisation of all life forms. A description of cell structure and cell growth by …
MOLECULAR BASIS OF INHERITANCE MOLECULAR BASIS OF INHERITANCE – DNA, The Search for Genetic Material, RNA World, Replication, Transcription, Genetic Code, Translation, Regulation of Gene Expression, Human Genome Project and DNA Fingerprinting (NCERT 12TH BIOLOGY) At the time of Mendel, the nature of those ‘factors’ regulating the pattern of inheritance was not clear. Over the …
GENETICS-PRINCIPLES OF INHERITANCE AND VARIATION NCERT BIOLOGY 12TH – GENETICS – Mendel’s Laws of Inheritance, Inheritance of One Gene, Inheritance of Two Genes, Sex Determination, Mutation and Genetic Disorders GENETICS being tackled was the mechanism of evolution. Awareness in the areas of molecular genetics, structural biology and bio informatics have enriched our understanding of the …
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REPRODUCTIVE HEALTH – Reproductive Health Problems and Strategies, Population Explosion and Birth Control, Medical Termination of Pregnancy, Sexually Transmitted Diseases and Infertility (NCERT BIOLOGY 12TH) The term simply refers to healthy reproductive organs with normal functions. However, it has a broader perspective and includes the emotional and social aspects of reproduction also. According to the …