AHSEC HS 2nd Year Biology Syllabus 2026-27

The AHSEC HS 2nd Year Biology Syllabus 2026-27 helps Assam board students understand the chapters, unit-wise marks distribution and practical topics prescribed for the final examination. Knowing the syllabus early makes it easier to prioritise important units, plan revision time, and prepare for both theory and practical assessments.

AHSEC Science Biology syllabus covers five units, including Reproduction, Genetics and Evolution, Biotechnology and Ecology, with 70 marks for theory and 30 marks for practicals. Students can review the chapter-wise topics, understand the marks distribution and practise practical activities to prepare systematically for the HS final examination.

AHSEC HS 2nd Year Biology Syllabus 2026-27: Unit-Wise Chapters and Topics

The AHSEC HS 2nd Year Biology theory syllabus has five units and fourteen chapters. Some chapters are shared by Botany and Zoology, so read them in full.

• Unit VI: Reproduction

• Chapter 1: Sexual reproduction in flowering plants, including pre-fertilisation, double fertilisation, post-fertilisation, apomixis and polyembryony.

• Chapter 2: Human reproduction, including the male and female reproductive systems, gametogenesis, the menstrual cycle, fertilisation, implantation and pregnancy.

• Chapter 3: Reproductive health, including population stabilisation, birth control, medical termination of pregnancy and infertility.

• Unit VII: Genetics and Evolution

• Chapter 4: Principles of inheritance and variation, including Mendel's laws, linkage, sex determination, mutation and genetic disorders.

• Chapter 5: Molecular basis of inheritance, including DNA, replication, transcription, the genetic code, translation, the Human Genome Project and DNA fingerprinting.

• Chapter 6: Evolution, including the origin of life, evidence for evolution, adaptive radiation, the Hardy-Weinberg principle and the origin of man.

• Unit VIII: Biology in Human Welfare

• Chapter 7: Human health and diseases, including common diseases, immunity, AIDS, cancer and drug and alcohol abuse.

• Chapter 8: Microbes in human welfare, including microbes in household and industrial products, sewage treatment, biogas, biocontrol agents and biofertilisers.

• Unit IX: Biotechnology

• Chapter 9: Biotechnology principles and processes, including recombinant DNA technology.

• Chapter 10: Biotechnology and its applications, including agriculture, medicine, transgenic animals and ethical issues.

• Unit X: Ecology

• Chapter 11: Organisms and populations, including population attributes, growth and interactions.

• Chapter 12: Ecosystems, including structure and function, productivity, decomposition, energy flow and ecological pyramids.

• Chapter 13: Biodiversity and conservation, including the National Parks and Sanctuaries of Assam and endangered species.

• Chapter 14: Bio-resources of Assam, including medicinal plants such as Sarpagandha, Neem, Tulsi, Cinchona and Atropa, timber plants such as Teak, Sal, Sissoo, Gomari and Hollong, and sericigenic resources such as Muga and Eri.

AHSEC HS 2nd Year Biology Syllabus PDF

Download the AHSEC HS 2nd Year Biology Syllabus PDF given below to review the syllabus and important topics for the 2026–27 academic session. Keep the PDF handy to plan your revision and track the topics you need to cover before the examination.

How to Prepare for the AHSEC HS 2nd Year Biology Exam

A steady routine works better than long study sessions just before the exam. The official syllabus lists two prescribed books, so start with them and use the steps below

• Read the prescribed books: Biology in English, published by NCERT, and Jiva Bigyan in Assamese, published by ASSEB DIV-II.

• Use the periodic table to plan how many days each unit needs.

• Make short notes with labelled diagrams for each chapter, especially for reproduction and genetics.

• Practise the practical lists regularly, and keep your practical record book updated.

• Solve sample questions from each unit and review the answers.

A clear view of the syllabus makes HS 2nd Year Biology easier to plan. Start with the units, practise the practicals and revise regularly so the exam feels familiar. Students who want guided lessons can explore ASSEB Class 12 Batches alongside their school studies for effective learning.