Padikam lessons

ORIGINAL STUDY COMPANION PADIKAM CLASS 11 | SCIENCE Biology Kerala SCERT / prescribed NCERT core lessons 20 chapter lessons Quick explanations, core points, exam practice and chapter-specific notation in one consistent format. Padikam explanations are independently written. Official textbooks are used as the coverage map, chapter sequence and terminology reference. PADIKAM | KERALA CLASS 11 1

Contents 01 The Living World 11 Photosynthesis in Higher Plants 02 Biological Classification 12 Respiration in Plants 03 Plant Kingdom 13 Plant Growth and Development 04 Animal Kingdom 14 Breathing and Exchange of Gases 05 Morphology of Flowering Plants 15 Body Fluids and Circulation 06 Anatomy of Flowering Plants 16 Excretory Products and Their Elimination 07 Structural Organisation in Animals 17 Locomotion and Movement 08 Cell: The Unit of Life 18 Neural Control and Coordination 09 Biomolecules 19 Chemical Coordination and Integration 10 Cell Cycle and Cell Division 20 Formative Reading: Digestion and Absorption Study rhythm Read the quick explanation, recall the core points aloud, then answer the prompts without looking back. Use the official textbook links for full prescribed readings, activities and diagrams. Textbook and verification links

1. https://samagra.kite.kerala.gov.in/files/samagra-resource/uploads/tbookscmq/Class_XI/Biology/Biology.pdf
2. https://ncert.nic.in/textbook.php PADIKAM | KERALA CLASS 11 2

CHAPTER 01 The Living World Quick understanding Define living organisation and use taxonomy to name and arrange biodiversity. Core points Check your learning Growth alone does not define life. Differentiate taxonomy and systematics. Binomial names use genus and species. Arrange taxonomic categories correctly. Taxonomic categories form a hierarchy from species upward. One-line recall Growth alone does not define life. PADIKAM | KERALA CLASS 11 3

CHAPTER 02 Biological Classification Quick understanding Compare major groups through cell type, organisation, nutrition and reproduction. Core points Check your learning Five-kingdom classification uses multiple characters. Compare Monera, Protista and Fungi. Archaea, bacteria and eukaryotic microbes differ Explain lichen or mycorrhiza as fundamentally. association. Viruses are acellular and reproduce only inside hosts. One-line recall Five-kingdom classification uses multiple characters. PADIKAM | KERALA CLASS 11 4

CHAPTER 03 Plant Kingdom Quick understanding Trace major plant groups from algae to angiosperms and compare life cycles. Core points Check your learning Vascular tissue and seeds mark major evolutionary Compare bryophytes and pteridophytes. transitions. Draw one life-cycle pattern. Bryophytes need water for fertilisation. Alternation of generations varies in dominant phase. One-line recall Vascular tissue and seeds mark major evolutionary transitions. PADIKAM | KERALA CLASS 11 5

CHAPTER 04 Animal Kingdom Quick understanding Classify animals using level of organisation, symmetry, germ layers, coelom and segmentation. Core points Check your learning Body-plan characters are more reliable than habitat Prepare a comparison table of major alone. phyla. Chordates possess a notochord at least during Distinguish chordates and non- development. chordates. Use defining features before examples. One-line recall Body-plan characters are more reliable than habitat alone. PADIKAM | KERALA CLASS 11 6

CHAPTER 05 Morphology of Flowering Plants Quick understanding Study external plant structures and their modifications as adaptations. Core points Check your learning Root, stem and leaf modifications perform special Describe a flower using floral formula functions. and diagram. Floral formula condenses flower structure. Identify a modification and its function. Fruit develops mainly from ovary; seed from ovule. One-line recall Root, stem and leaf modifications perform special functions. PADIKAM | KERALA CLASS 11 7

CHAPTER 06 Anatomy of Flowering Plants Quick understanding Connect tissues and internal structure with plant function and growth. Core points Check your learning Meristems divide; permanent tissues specialise. Compare dicot and monocot stem sections. Xylem and phloem are complex tissues. Explain secondary growth briefly. Dicot and monocot roots, stems and leaves show diagnostic differences. One-line recall Meristems divide; permanent tissues specialise. PADIKAM | KERALA CLASS 11 8

CHAPTER 07 Structural Organisation in Animals Quick understanding Relate animal tissues and organ systems to coordinated function. Core points Check your learning Epithelial tissue covers; connective supports; muscle Compare tissue types. contracts; nervous tissue conducts. Explain one organ system using labelled Organ systems integrate specialised tissues. structure. Structure should be linked to function. One-line recall Epithelial tissue covers; connective supports; muscle contracts; nervous tissue conducts. PADIKAM | KERALA CLASS 11 9

CHAPTER 08 Cell: The Unit of Life Quick understanding Treat the cell as the structural and functional unit and compare organelles. Core points Check your learning Prokaryotic cells lack membrane-bound organelles. Compare prokaryotic and eukaryotic cells. Membranes control transport and compartmentalise reactions. Explain structure and function of mitochondria or chloroplast. Organelles cooperate rather than function independently. One-line recall Prokaryotic cells lack membrane-bound organelles. PADIKAM | KERALA CLASS 11 10

CHAPTER 09 Biomolecules Quick understanding Relate carbohydrates, proteins, lipids, nucleic acids and enzymes to cellular structure and metabolism. Core points Check your learning Monomers combine into macromolecules. Compare major biomolecule classes. Protein shape determines function. Interpret an enzyme activity graph. Enzymes lower activation energy and are affected by conditions. One-line recall Monomers combine into macromolecules. PADIKAM | KERALA CLASS 11 11

CHAPTER 10 Cell Cycle and Cell Division Quick understanding Follow DNA duplication and chromosome movement through mitosis and meiosis. Core points Check your learning Interphase prepares the cell; it is not a resting Compare mitosis and meiosis. absence of activity. Identify stages from chromosome Mitosis preserves chromosome number. behaviour. Meiosis halves chromosome number and creates variation. One-line recall Interphase prepares the cell; it is not a resting absence of activity. PADIKAM | KERALA CLASS 11 12

CHAPTER 11 Photosynthesis in Higher Plants Quick understanding Explain light capture, electron transfer, ATP/NADPH production and carbon fixation. Core points Check your learning Light reactions occur in thylakoids; Calvin cycle in Compare cyclic and non-cyclic stroma. photophosphorylation. C₄ plants concentrate CO₂ and reduce Explain C₃ and C₄ pathways. photorespiration. Rate depends on light, CO₂, temperature and plant condition. Equation and notation 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6O₂ + 6H₂O SYMBOLS AND UNITS CO2: carbon dioxide H2O: water C6H12O6: glucose O2: oxygen Arrow: overall reaction direction in the presence of light and pigments One-line recall Light reactions occur in thylakoids; Calvin cycle in stroma. PADIKAM | KERALA CLASS 11 13

CHAPTER 12 Respiration in Plants Quick understanding Trace oxidation of food through glycolysis, Krebs cycle and electron transport. Core points Check your learning Glycolysis occurs in cytoplasm. Compare aerobic respiration and fermentation. Most aerobic ATP is linked to oxidative phosphorylation. Locate major stages and products. Fermentation partially oxidises glucose without oxygen. Equation and notation C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy SYMBOLS AND UNITS C6H12O6: glucose O2: oxygen CO2: carbon dioxide H2O: water Energy is conserved in ATP and released as heat One-line recall Glycolysis occurs in cytoplasm. PADIKAM | KERALA CLASS 11 14

CHAPTER 13 Plant Growth and Development Quick understanding Distinguish growth, differentiation and development and examine hormonal control. Core points Check your learning Growth may be measured as increase in size, mass Draw a sigmoid growth curve. or cell number. Match hormones with major actions. Meristems produce open growth in plants. Auxin, gibberellin, cytokinin, ABA and ethylene have interacting effects. One-line recall Growth may be measured as increase in size, mass or cell number. PADIKAM | KERALA CLASS 11 15

CHAPTER 14 Breathing and Exchange of Gases Quick understanding Follow ventilation, diffusion and transport of oxygen and carbon dioxide. Core points Check your learning Pressure gradients move gases. Trace air to the alveoli. Haemoglobin greatly increases oxygen transport. Explain oxygen dissociation factors. Medullary centres regulate breathing rhythm. One-line recall Pressure gradients move gases. PADIKAM | KERALA CLASS 11 16

CHAPTER 15 Body Fluids and Circulation Quick understanding Compare blood, lymph, vessels and the cardiac cycle in a closed double circulation. Core points Check your learning Plasma and formed elements have distinct roles. Trace one complete circulation. Valves maintain one-way flow. Interpret an ECG or cardiac-cycle diagram. Human circulation separates oxygenated and deoxygenated blood. One-line recall Plasma and formed elements have distinct roles. PADIKAM | KERALA CLASS 11 17

CHAPTER 16 Excretory Products and Their Elimination Quick understanding Explain nitrogenous wastes, nephron filtration and regulation of water and ions. Core points Check your learning Filtration, reabsorption and secretion form urine. Label a nephron and trace filtrate. Counter-current mechanisms concentrate urine. Compare ammonotelic, ureotelic and uricotelic animals. ADH regulates water reabsorption. One-line recall Filtration, reabsorption and secretion form urine. PADIKAM | KERALA CLASS 11 18

CHAPTER 17 Locomotion and Movement Quick understanding Relate muscle contraction, bones and joints to movement. Core points Check your learning Actin and myosin slide rather than shorten. Explain the sliding-filament model. ATP and calcium are essential for contraction. Classify joints with examples. The skeleton supports, protects and provides levers. One-line recall Actin and myosin slide rather than shorten. PADIKAM | KERALA CLASS 11 19

CHAPTER 18 Neural Control and Coordination Quick understanding Follow electrical and chemical signalling through neurons, synapses, brain and sensory organs. Core points Check your learning Resting and action potentials depend on ion Draw a neuron and explain impulse distribution. transmission. Chemical synapses transmit in one direction. Relate eye or ear structure to function. Different brain regions specialise but coordinate. One-line recall Resting and action potentials depend on ion distribution. PADIKAM | KERALA CLASS 11 20

CHAPTER 19 Chemical Coordination and Integration Quick understanding Understand endocrine glands, hormones, feedback and homeostasis. Core points Check your learning Hormones act on target cells with receptors. Prepare a gland-hormone-function table. Peptide and steroid hormones use different Explain one endocrine disorder through signalling routes. feedback. Negative feedback stabilises internal conditions. One-line recall Hormones act on target cells with receptors. PADIKAM | KERALA CLASS 11 21

CHAPTER 20 Formative Reading: Digestion and Absorption Quick understanding Trace food through the alimentary canal and connect enzymes, absorption surfaces and assimilation with nutrition. Core points Check your learning Mechanical processing increases surface area while Prepare an enzyme-substrate-product enzymes hydrolyse specific nutrients. table. Villi and microvilli enlarge the intestinal absorptive Explain how small-intestinal structure surface. supports absorption. Absorbed nutrients enter blood or lymph and are distributed for use, storage or conversion. Watch this This restored textbook topic is formative reading unless the current school assessment notice states otherwise. One-line recall Mechanical processing increases surface area while enzymes hydrolyse specific nutrients. PADIKAM | KERALA CLASS 11 22