Biology
27 notes tagged Biology.
- Environment
Plant and Animal Classification Basics
The NCERT biology basics tested in Environment: the plant kingdom's five divisions, flowering-plant morphology from root to flower, three Indian plant families by their floral characters, the criteria that sort animal phyla, and the four classes of fungi.
- Science & Technology
Microbes, Immunity and Modern Biotechnology
How NCERT links three topics: microbes as an industrial workforce, the immune system's B and T cells, and biotech tools like Bt cotton and gene therapy.
- Science & Technology
Cell Biology, Molecular Genetics and Evolution
NCERT's foundational biology story: the cell as the basic unit of life, the double helix, and the hominin timeline from Dryopithecus to Homo sapiens.
- Science & Technology
Viruses, Viroids and Prions
Why viruses, viroids and prions sit outside Whittaker's five kingdoms, and what actually separates a lytic bacteriophage cycle from a lysogenic one.
- Science & Technology
Recombinant DNA, PCR and Gene Editing Tools
The real biotechnology process: PCR, gel electrophoresis, competent cells, plasmid vectors, and how CRISPR-Cas9 and RNAi differ from cutting DNA.
- Science & Technology
Plant Kingdom and Physiology
NCERT's plant kingdom: algae to angiosperms, lichens as pollution indicators, xerophyte survival tactics, and how plant diseases actually spread.
- Science & Technology
Principles of Inheritance and Variation
Mendel's pea crosses, monohybrid and dihybrid ratios, Morgan's fruit-fly linkage work, sex determination, sex-linked disorders and mitochondrial inheritance.
- Science & Technology
Animal Reproduction and Feeding Habits
Oviparous, viviparous and parthenogenetic reproduction, plus herbivore, carnivore and filter-feeding adaptations, with real named animal examples.
- Science & Technology
Common Diseases, AIDS, Cancer and Drug Abuse
Typhoid to viral hepatitis, malaria's mosquito life cycle, HIV versus AIDS, benign versus malignant tumours, and the real biology of drug abuse.
- Science & Technology
Blood, Lymph and the Circulatory System
Blood's plasma and formed elements, the ABO and Rh systems, lymph, the heart's chambers and valves, the cardiac cycle, and double circulation.
- Science & Technology
The Living World: Classification and Taxonomic Aids
Growth alone doesn't prove something is alive since crystals grow too, and a herbarium sheet, a flora and a monograph are three genuinely different taxonomic aids, not synonyms.
- Science & Technology
Biomolecules: Macromolecules and Enzymes
An enzyme's active site is not a rigid lock waiting for the right key, it actively reshapes itself around the substrate, and that reshaping is what actually speeds up the reaction.
- Science & Technology
The Cell Cycle, Mitosis and Meiosis
Mitosis makes two identical copies for growth and repair, meiosis makes four genetically shuffled halves for reproduction, and confusing which one produces variation is the standard exam trap.
- Science & Technology
Morphology of Flowering Plants
A racemose inflorescence keeps growing indefinitely because its tip never becomes a flower, while a cymose one stops growing the moment its own tip does exactly that.
- Science & Technology
Anatomy of Flowering Plants
A dicot stem can keep growing thicker every year because it kept its cambium; a monocot's vascular bundles closed that door permanently the moment they formed.
- Science & Technology
Structural Organisation in Animals: The Four Tissue Types
Cardiac muscle is striated like skeletal muscle but involuntary like smooth muscle, sitting deliberately between the other two types rather than belonging cleanly to either.
- Science & Technology
Photosynthesis in Higher Plants
The same enzyme that fixes carbon dioxide can also waste energy by grabbing oxygen instead, and Kranz anatomy exists specifically to stop it from ever getting the chance.
- Science & Technology
Respiration in Plants
Glycolysis happens the same way whether oxygen is present or not, and it's only what happens to its two pyruvate molecules afterward that decides whether a cell nets 2 ATP or 36.
- Science & Technology
Plant Growth and Development: Hormones and Flowering
A disease Japanese farmers called 'foolish seedling' led straight to the discovery of gibberellin, and coconut milk is still the standard natural source of a growth hormone found by pure accident.
- Science & Technology
Breathing and Exchange of Gases
A normal breath moves only about 500 ml of air, a small fraction of what the lungs can actually hold, and most of the carbon dioxide you exhale never travelled as a dissolved gas at all.
- Science & Technology
Excretory Products and their Elimination
A falling glomerular filtration rate triggers a hormone cascade that ends in a vasoconstrictor powerful enough to raise blood pressure specifically to push that filtration rate back up.
- Science & Technology
Locomotion and Movement: Muscles and the Skeleton
During muscle contraction the A band never changes length at all, since the filaments themselves don't shrink, they just slide further into each other.
- Science & Technology
Neural Control and Coordination
A resting neuron sits at about -70 millivolts purely because a pump keeps trading three sodium ions out for only two potassium ions in, a lopsided swap the whole nervous system runs on.
- Science & Technology
Chemical Coordination and Integration: The Endocrine System
The posterior pituitary doesn't actually make the two hormones it releases, it just stores and ships what the hypothalamus next door already produced.
- Science & Technology
Sexual Reproduction in Flowering Plants
A flowering plant's fertilization event is a double one, and the second fusion doesn't even make an embryo, it makes the tissue that will feed the embryo once it starts growing.
- Science & Technology
Human Reproduction: The Menstrual Cycle
A rising hormone triggers a burst of a second hormone that then triggers the exact event named after it: the luteinising hormone surge is what actually makes ovulation happen.
- Science & Technology
Reproductive Health: Law and Assisted Reproduction
GIFT places unfertilised eggs and sperm together in the fallopian tube and lets fertilization happen naturally inside the body, which is exactly what separates it from IVF and ZIFT.