Class 12 Biology
Biology is the study of living organisms, including their structure, functions, growth, reproduction, heredity, evolution, ecology and relationships with the environment. Students develop an understanding of cells, tissues, organisms and biological processes while learning to interpret diagrams, terminology, data and scientific explanations. The subject pages organise learning into chapters and topics for focused study. Topic-wise MCQs help students check concepts and recall, while answers and clear explanations show why an option is correct and help identify misunderstandings. Together, these resources support systematic revision, practice and stronger understanding of key biological ideas.
1Molecular Basis of Inheritance
अध्याय 5: वंशागति का आणविक आधार
This Class 12 Biology chapter explains how hereditary information is stored, copied, expressed, and passed from one generation to the next. Students explore the structure of DNA and RNA, DNA replication, transcription, translation, the genetic code, and gene regulation. It also introduces mutations, the lac operon, the Human Genome Project, and DNA fingerprinting, helping learners connect molecular processes with inheritance, variation, biotechnology, and biological identification.
1 topics · 9 questionsChapter 2: Human Reproduction
मानव प्रजनन
In Class 12 Biology, Chapter 2, Human Reproduction, explains the male and female reproductive systems, gametogenesis, and the microscopic structure of the testis and ovary. It covers the menstrual cycle, fertilization, early embryo development up to blastocyst formation, implantation, pregnancy, and placenta formation. The chapter also describes parturition and lactation, helping students understand the major stages and processes involved in human reproduction.
8 topics · 50 questionsChapter 3: Reproductive Health
प्रजनन स्वास्थ्य
In Class 12 Biology, Chapter 3, Reproductive Health, explains the importance of responsible reproductive practices and informed family planning. It covers birth control methods, the need to prevent sexually transmitted infections, and the role of awareness in maintaining reproductive well-being. The chapter also introduces infertility and assisted reproductive technologies, along with amniocentesis and the ethical concerns associated with its misuse.
4 topics · 150 questionsPrinciples of Inheritance and Variation
वंशागति और विविधता के सिद्धांत
Class 12 Biology students explore how traits are transmitted from parents to offspring and why variation occurs within populations. The chapter explains Mendel’s experiments, laws of inheritance, alleles, genotype and phenotype, and the use of Punnett squares to predict traits. It also introduces chromosomal inheritance, linkage and recombination, sex determination, mutations, and selected genetic disorders, helping learners connect genetic principles with biological diversity.
1 topics · 0 questions