🌿 OPTIONAL — BOTANY

Papers: VI & VII · 500 marks. GS overlap: MODERATE — GS-III (agriculture, environment, biotechnology). Best for: botany/life-science/agriculture graduates.

⚠️ Verify against the current UPSC notification at upsc.gov.in.

PAPER I

1. Microbiology and Plant Pathology: viruses, bacteria and plasmids — structure and reproduction; general account of infection, phytoimmunology; applications of microbiology in agriculture, industry, medicine and pollution control in air, soil and water; important plant diseases in India caused by fungi, bacteria, mycoplasma, viruses and nematodes; mode of infection and dissemination; molecular basis of infection and disease resistance/defence; physiology of parasitism and control measures; fungal toxins.
2. Cryptogams: algae, fungi, bryophytes, pteridophytes — structure and reproduction from evolutionary viewpoint; distribution of cryptogams in India and their economic potential.
3. Phanerogams: gymnosperms — concept of progymnosperms; classification and distribution of gymnosperms; salient features of Cycadales, Coniferrals and Gnetales, their structures and reproduction; general account of Cycadofilicales, Bennettitales and Cordaitales. Angiosperms — systematics, anatomy, embryology, palynology and phylogeny; comparative account of various systems of classification of angiosperms; study of angiospermic families — Magnoliaceae, Ranunculaceae, Brassicaceae, Rosaceae, Leguminosae, Euphorbiaceae, Malvaceae, Dipterocarpaceae, Apiaceae, Asclepiadaceae, Verbenaceae, Solanaceae, Rubiaceae, Cucurbitaceae, Asteraceae, Poaceae, Arecaceae, Liliaceae, Musaceae and Orchidaceae. Stomata and their types; anomalous secondary growth; anatomy of C3 and C4 plants; development of male and female gametophytes, pollination, fertilization; endosperm — its development and function; patterns of embryo development; polyembryony, apomixis; applications of palynology.
4. Plant Utility and Exploitation: origin of cultivated plants, vavilov's centres of origin; plants as sources for food, fodder, fibres, spices, beverages, drugs, narcotics, insecticides, timber, gums, resins and dyes; latex, cellulose, starch and its products; perfumery; importance of Ethnobotany in Indian context; energy plantations; botanical gardens and herbaria.
5. Morphogenesis: totipotency, polarity, symmetry and differentiation; cell, tissue, organ and protoplast culture; somatic hybrids and cybrids.

PAPER II

1. Cell Biology: techniques of cell biology; prokaryotic and eukaryotic cells — structural and ultrastructural details; structure and function of extracellular matrix or ECM (cell wall) and membranes — cell adhesion, membrane transport and vesicular transport; structure and function of cell organelles (chloroplasts, mitochondria, ER, ribosomes, endosomes, lysosomes, peroxisomes, hydrogenosomes); nucleus, nucleolus, nuclear pore complex; chromatin and nucleosome; cell signalling and cell receptors; signal transduction; mitosis and meiosis; molecular basis of cell cycle; numerical and structural variations in chromosomes and their significance; study of polytene, lampbrush and B-chromosomes — structure, behaviour and significance.
2. Genetics, Molecular Biology and Evolution: development of genetics, and gene versus allele concepts (Pseudoalleles); Mendelian and non-Mendelian inheritance; laws of inheritance; interaction of genes; concept of cytoplasmic inheritance; genetic mapping; incomplete dominance and codominance; multiple alleles; linkage and crossing over — methods of gene mapping including molecular maps (idea of mapping function); sex chromosomes and sex-linked inheritance, sex determination and molecular basis of sex differentiation; mutation (biochemical basis of mutation, molecular basis of mutations, mutagenesis, physical and chemical mutagens, transposons); structure and synthesis of nucleic acids and proteins; genetic code and regulation of gene expression; multigene families; organic evolution — evidences, mechanism and theories; role of RNA in origin and evolution.
3. Plant Breeding, Biotechnology and Biostatistics: methods of plant breeding — introduction, selection and hybridization (pedigree, backcross, mass selection, bulk method); mutation, polyploidy, male sterility and heterosis breeding; use of apomixis in plant breeding; DNA sequencing; genetic engineering — methods of transfer of genes; transgenic crops and biosafety aspects; development of marker-free transgenics; use of biotechnology in the improvement of crop plants; biofertilizers and biopesticides; tissue culture and its applications; sampling methods and sample size; probability distributions (normal, binomial and Poisson); tests of statistical significance (chi-square, t-test, F-test); correlation and regression; analysis of variance.
4. Physiology and Biochemistry: water relations, mineral nutrition and ion transport, mineral deficiencies; photosynthesis — photochemical reactions, photophosphorylation and carbon fixation pathways; C3, C4 and CAM pathways; mechanism of phloem transport; respiration (anaerobic and aerobic, including fermentation) — electron transport chain and oxidative phosphorylation; photorespiration; chemiosmotic theory and ATP synthesis; lipid metabolism; nitrogen fixation and nitrogen metabolism; enzymes, coenzymes; energy transfer and energy conservation; importance of secondary metabolites; pigments as photoreceptors (plastidial pigments and phytochrome); plant movements; photoperiodism and flowering, vernalization, senescence; growth substances — their chemical nature, role and applications in agri-horticulture; growth indices, growth movements; stress physiology (heat, water, salinity, metal); fruit and seed physiology; dormancy, storage and germination of seed; fruit ripening — its molecular basis and manipulation.
5. Ecology and Plant Geography: ecological factors; concepts and dynamics of community; plant succession; concept of biosphere; ecosystems and their conservation; pollution and its control (including phytoremediation); forest types of India — afforestation, deforestation and social forestry; endangered plants, endemism and Red Data Books; biodiversity; convention on biological diversity; farmers' rights; IPR and Germplasm protection; biogeochemical cycles; global warming.

BOOKLIST

STRATEGY

• Diagrams win marks — draw labelled structures, life cycles, pathways and flow charts in every answer.
• Life cycles (algae, fungi, bryophytes, pteridophytes, gymnosperms) are guaranteed questions — master them.
• Link Paper II to current topics: GM crops, biodiversity conventions, climate impacts.
• Practise drawing under time pressure — many candidates run out of time.
• Solve 15 years of PYQs.

Pros: diagram-heavy (faster than writing); static syllabus; good GS-III overlap in ecology/agriculture; modest competition. Cons: vast factual content; requires strong biology base; heavy drawing load.