BSc Zoology 2nd Semester Notes PDF
Master your second semester of BSc Zoology Hons. at Delhi University (DU). Download complete unit-wise theory PDFs, diagrams, and fully solved previous year questions (PYQs).
π DU Semester 2 Syllabus Overview
Official DU SyllabusThe second semester of BSc Zoology (Hons.) introduces students to major invertebrate groups, biochemical molecules essential for life, and physiological control systems in humans. The core subjects include:
Unit I: Annelida
Topics Covered: General characteristics and classification of Annelida; Excretion in Annelida; Evolution of coelom and metamerism.
Unit II: Arthropoda and Onychophora
Topics Covered: General characteristics and classification; Vision and Respiration in Arthropoda; Metamorphosis in insects; Evolutionary significance of Onychopora.
Unit III: Mollusca
Topics Covered: General characteristics and classification; Respiration in Mollusca; Torsion and Detorsion in Gastropoda; Pearl formation in bivalves.
Unit IV: Echinodermata
Topics Covered: General characteristics and classification; Water Vascular or Ambulacral System in Star Fish or Asterias (Asteroidea)
Quick Revision Summary, Most Important Questions and Frequently repeated PYQs for (DSC-4): Non-Chordata: Coelomates
DU previous year question papers (PYQ) for BSc Zoology second semester Non Chordata exam.
Unit I: Carbohydrates
Topics Covered: Structure and biological importance: with emphasis on aldose, ketose, chiral centre, polarised Light, Fischer nomenclature, Haworth projection formula.
Unit II: Lipids
Topics Covered: Structure and Significance: Physiologically important saturated and unsaturated fatty acids, triacylglycerols, phospholipids, glycolipids, steroids.
Unit III: Proteins
Topics Covered: Amino acids: Structure, classification and general properties of Ξ±-amino acids; physiological importance of essential and non-essential amino acids; proteins: bonds stabilizing protein structure; Levels of organization in protein motifs, folds and domains; Ramachandran Plot, Denaturation of proteins.
Unit IV: Nucleic Acids
Topics Covered: Structure: purines and pyrimidines, nucleosides, nucleotides, nucleic acids; Cot Curves: Base pairing, Denaturation and Renaturation of DNA; Types of DNA (A-DNA, B-DNA and Z-DNA) and RNA (rRNA, tRNA and mRNA), Clover leaf model of trna.
Unit V: Enzymes
Topics Covered: Nomenclature and classification, cofactors; specificity of enzyme action, Isozymes, Mechanism of enzyme action; Enzyme kinetics; factors affecting rate of enzyme-catalysed reactions; derivation of Michaelis-Menten equation, concept of Km and Vmax, Lineweaver-Burk plot, multi-substrate reactions, enzyme inhibition; Allosteric enzymes and their kinetics; Regulation of enzyme reaction.
Quick Revision Summary, Most Important Questions and Frequently repeated PYQs for (DSC-5): Fundamentals of Biomolecules
DU previous year question papers (PYQ) for BSc Zoology second semester Biomolecules exam.
Unit I: Nervous System and Sense Organs
Topics Covered: Structure of neuron, resting membrane potential, origin and conduction of action potential across the myelinated and unmyelinated nerve fibers.
Unit II: Muscle Physiology
Topics Covered: Mechanism of muscle contraction; Sliding Filament theory, Excitation-Contraction coupling, Characteristics of muscle twitch.
Unit III: Endocrine System
Topics Covered: Hormones secreted by the glands, their physiological action and the disorders related to their secretion; Classification of hormones and their regulation; Mode of hormone action- Signal transduction pathways for peptide and steroid hormones.
Unit IV: Reproductive System
Topics Covered: Physiology of male and female reproductionβ spermatogenesis, oogenesis, follicular development, steroidogenesis, implantation, pregnancy, and mammary gland development.
Quick Revision Summary, Most Important Questions and Frequently repeated PYQs for (DSC-6): Human Physiology-Control and Coordination Systems
DU previous year question papers (PYQ) for BSc Zoology second semester Human Physiology exam.
Your Blueprint for 2nd Semester Excellence
Moving into your second semester means handling the intricate details of Coelomates, the chemistry of life, and complex human control systems. We structured these materials to help you visualize, memorize, and confidently tackle your DU exams.
Mapping Invertebrates
Navigating the characteristics from Annelids to Echinoderms can get confusing fast. Our bsc zoology 2nd semester notes pdf break down classifications, excretory systems, and evolutionary milestones using crystal-clear flowcharts.
Cracking Biomolecules
Don't let biochemical structures intimidate you. We simplify proteins, lipid metabolism, and complex enzyme kinetics into highly visual, easy-to-retain formats so you can ace your DSC-5 paper without rote memorization.
Physiology Made Simple
From nerve action potentials to endocrine cascades and muscle twitches, our notes provide the high-yield diagrams and step-by-step explanations that DU professors look for in top-scoring answer sheets.
π How to Score 9+ CGPA in BSc Zoology Hons
Scoring a 9+ CGPA in BSc Zoology Hons at Delhi University isn't really about reading more. It's about studying in the right order. Here's the method that actually works for semester exams, based on how DU papers are usually set.
Start with the PYQs, not the notes
Before opening any unit, go through the previous year questions (PYQs) already available on this page. This shows you exactly which topics get asked again and again in the Zoology exam, so you know where to put your first round of effort instead of studying every unit with equal priority.
Download the notes and study that topic properly
Once you know which topics matter most, download the unit-wise notes for that topic and actually read through it instead of jumping straight to definitions. Understanding a concept once makes it far easier to recall in the exam than memorising it without context.
Practice every diagram and flowchart
Zoology answers carry real weightage for labelled diagrams and flowcharts, things like life cycles, cell structures, and biochemical pathways. Sketch these out by hand a few times rather than just looking at them. A clean, correctly labelled diagram often earns marks even when the written explanation is average.
Go back to the PYQs and test yourself
After finishing a topic, return to the same previous year questions and try answering them from memory, without your notes open. This is much closer to actual exam conditions than passive revision, and it tells you honestly which parts you still need to revisit.
Write full answers under a timer, at least once
For long-answer questions, practice writing a complete answer within a set time limit before the actual exam. Knowing the content isn't the same as being able to structure and finish it in time, so this step matters more than most students expect.
Finish one topic fully before moving to the next
Repeat this PYQ, notes, diagram, and self-test cycle one topic at a time across every unit rather than skimming all units once. It keeps each topic genuinely exam-ready instead of leaving several topics half-prepared right before the semester exam.
β Frequently Asked Questions
The second semester of BSc Zoology at Delhi University includes Non-Chordata: Coelomates, Fundamentals of Biomolecules, and Human Physiology focusing on control and coordination systems.
Yes. These notes are structured exactly according to the latest Delhi University BSc Zoology (Hons.) syllabus and include unit-wise explanations, diagrams, and important questions.
Yes, the notes include clear and well-labelled diagrams wherever required, such as structures, physiological processes, and biological systems. These diagrams are designed to help students write better answers in exams and score higher marks.
Yes. For subjects like Biochemistry and Biomolecules, the notes include important structures, pathways, and key mechanisms that are commonly asked in university exams and helps to score better.
Yes. The notes are specifically designed according to the Delhi University BSc Zoology (Hons.) syllabus, making them relevant for DU students preparing for their semester exams.
The best way to prepare for DU Zoology exams is to focus on clear, structured notes and important exam questions. Start by studying the complete unit-wise notes to understand the concepts properly. After that, go through the most important questions and previous year questions, which help you understand the exam pattern and frequently asked topics.
If you cover the notes thoroughly and revise the important questions provided on this website, you will be well prepared for your semester exams.
Yes! Important previous year questions (PYQs) from past Delhi University Zoology exams are integrated into the units for download for better exam preparation.
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