📖 BSc Life Science 1st Semester Notes PDF
Master your first semester at Delhi University (DU). Unit-wise notes for the three core papers of BSc Life Science (Botany, Chemistry and Zoology) are being added one unit at a time, and previous year questions (PYQs) and practical files are coming soon.
Notes prepared by Preeti Kumari, Hansraj College, University of Delhi.
📋 DU Life Science Semester 1 Syllabus Overview
Official DU SyllabusThe first semester of BSc Life Science (Prog.) follows the UGCF 2022 syllabus and brings together Botany, Chemistry and Zoology. The core papers (DSCs) are 4 credits each, with 2 theory and 2 practical:
(BOT-DSC-1) Plant Diversity & Systematics
Unit 1: Diversity of Life
Topics covered: Classifying the diversity of life: Domains of Life – Eubacteria, Archaea and Eukaryotes.
Unit 2: Microbes
Topics covered: Viruses: general account, replication, lytic and lysogenic cycle; Bacteria: structure, wall-less forms (L-forms, Mycoplasma), asexual reproduction and genetic recombination.
Unit 3: Algae
Topics covered: Brief introduction of major classes: blue-green, green, brown and red algae; diagnostic features of identification; morphology, reproduction and classification with special reference to Nostoc, Volvox and Spirogyra.
Unit 4: Fungi
Topics covered: Diagnostic features of identification; morphology, reproduction and classification with special reference to Rhizopus, Penicillium and Agaricus; lichens (a general account).
Unit 5: Bryophytes, Pteridophytes and Gymnosperms
Topics covered: Characteristic features of identification; morphology and reproduction of Bryophytes, Pteridophytes and Gymnosperms with special reference to Marchantia, Funaria, Pteris and Pinus (only morphology).
Unit 6: Angiosperms
Topics covered: Diagnostic features, structure of a flower, types of inflorescence.
Unit 7: Systematics
Topics covered: Aims, fundamental components of systematics, description, identification, nomenclature, phylogeny, biosystematics.
Unit 8: Systematics in Practices
Topics covered: Taxonomic hierarchy: concept of taxa and categories; botanical nomenclature: principles and rules; type method; author citation; valid publication; rejection of names; principle of priority and its limitations; names of hybrids and cultivars.
Unit 9: Systems of Classification
Topics covered: Artificial, natural and phylogenetic classification; an outline of Bentham and Hooker (up to series only) and Engler and Prantl (up to subclasses) systems with their merits and demerits; the APG system.
DU previous year question papers for BOT-DSC-1.
Practical file for BOT-DSC-1.
(CHEM-DSC-01) Basic Concepts of Organic Chemistry
Unit 1: Fundamentals of Organic Chemistry
Topics covered: Electronic displacements: inductive, resonance, hyperconjugation and electromeric effects; reactive intermediates and their stability (carbocations, free radicals, carbanions, benzyne, carbenes); acidity and basicity in organic compounds.
Unit 2: Stereochemistry
Topics covered: Projection formulae: flying wedge, Newman, sawhorse and Fischer representations and their interconversion; chirality, geometrical and optical isomerism, enantiomers, diastereomers and meso compounds; threo and erythro; D and L; cis-trans, R/S and E/Z nomenclature; conformations of ethane, butane and cyclohexane.
Unit 3: Types of Organic Reactions
Topics covered: Electrophilic addition; nucleophilic addition to carbonyl compounds (including aldol, Claisen-Schmidt, benzoin, Perkin and Grignard reactions); nucleophilic substitution (SN1, SN2) and elimination (E1, E2); aromatic nucleophilic and electrophilic substitution; reactive intermediates and rearrangement reactions.
DU previous year question papers for CHEM-DSC-01.
Practical file for CHEM-DSC-01.
(ZOO-DSC-01) Diversity of Animals
Unit I: Introduction
Topics covered: Five kingdom classification system; general characters of kingdom Animalia and the basis of its classification (with special reference to coelom); taxonomic hierarchy up to species level; significance of binomial nomenclature.
Unit II: Protista to Pseudocoelomates
Topics covered: Characteristics of acoelomates and pseudocoelomates; locomotory organelles and locomotion in Protozoa; canal system in Porifera; polymorphism in Cnidaria (Hydrozoa); life cycles of Taenia solium and Ascaris lumbricoides and their parasitic adaptations.
Unit III: Coelomates
Topics covered: General features of coelomates; metamerism in Annelida; vision in Arthropoda; metamorphosis in insects; torsion and detorsion in Gastropoda; pearl formation; water-vascular system in Asteroidea.
Unit IV: Chordates
Topics covered: Salient features of protochordates and chordates, Retrogressive metamorphosis in protochordates, Osmoregulation, Migration, and Parental care in fishes, Parental care in Amphibians, Flight adaptations and Migration in birds, Biting mechanism in snakes, Origin of mammals.
DU previous year question papers for ZOO-DSC-01.
Practical file for ZOO-DSC-01.
Your Blueprint for 1st Semester Life Science Success
BSc Life Science puts Botany, Chemistry and Zoology in the same semester. We designed these resources to cut out the noise and give you exactly the part of each paper you need.
One Place for Three Subjects
Don't waste time searching three different books. Our bsc life science 1st semester notes break each paper into its syllabus units, so you can open exactly the topic you are revising.
Practical Files Are Next
Each paper has 15 practical classes of 4 hours. Practical files for Semester 1 are coming soon. Until then, use the practical list in the syllabus to plan your lab record.
PYQs Coming Soon
Previous year questions show how DU frames its papers. We are collecting and organising them for this semester, and they will appear on this page as soon as they are ready.
📈 How to Study for a 9+ CGPA in BSc Life Science
A strong CGPA in BSc Life Science isn't really about reading more. It's about studying in the right order across three subjects. Here is a method that works for semester exams.
Start with the syllabus
Read the unit list for each paper first. The lecture hours show where the weight sits: for example, Organic Chemistry Unit 3 is 18 of 30 lectures. Once PYQs are added to this page, use them to see which topics repeat.
Study one unit properly with the notes
Pick one unit and read it through instead of jumping to definitions. Understanding a concept once makes it far easier to recall in the exam than memorising it without context.
Practise every diagram, life cycle and mechanism
Botany has life cycles, Zoology has labelled diagrams and Chemistry has reaction mechanisms. Draw or write each one by hand a few times instead of only looking at it.
Test yourself from memory
After finishing a unit, close the notes and try to write the key points, diagrams and mechanisms from memory. Whatever you can't recall is what to revise next.
Write full answers under a timer, at least once
For long-answer questions, practise writing a complete answer within a set time. It teaches you to structure and finish an answer in time, which matters in the exam hall.
Rotate across the three subjects
All three papers carry 4 credits, so don't leave one for last. Finish one unit at a time, and switch between Botany, Chemistry and Zoology through the week.
❓ Frequently Asked Questions
Semester 1 has three Discipline Specific Core (DSC) papers: Plant Diversity and Systematics (BOT-DSC-1), Basic Concepts of Organic Chemistry (CHEM-DSC-01) and Diversity of Animals (ZOO-DSC-01). Each is 4 credits, with 2 theory and 2 practical.
Yes. The notes are organised unit by unit around the Delhi University UGCF 2022 syllabus for BSc (Life Science) and prepared by Preeti Kumari, a Hansraj College student.
Notes are being added one unit at a time. Units with an Access Notes button are available now, and the rest are marked Coming Soon.
Not yet. Practical files and PYQs are marked Coming Soon for each paper and will appear on this page when they are ready.
No. Our Life Science notes cover only the Discipline Specific Core (DSC) papers.
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