Study Plan for ISC Class 12 Biology: The ISC Class 12 is the most senior CISCE board class. Students of Class 12th streams study different subjects to prepare for the final board exams, which also play a crucial role in deciding their further studies. Biology is one of the subjects for Science stream students.
Students preparing for the 2024-25 board exams must be looking for a good study routine that will give them enough time to complete the syllabus and revise it before the exam. Here is a detailed plan given for the ISC Biology that can be followed for the 2025 boards. The study routine is prepared based on the unit-wise weightage and thus provides the preference as per marks.
Also Check: ISC Class 12 Specimen Paper PDFs (All Subjects)
ISC Class 12 Biology Study Plan for 2025 Board Exams
Here’s the week-wise study plan for ISC Class 12 Biology in a tabular format, prioritising the topics according to the marks distribution:
| Month | Week | Unit | Topics | Weightage |
| Month 1 | Week 1 | Reproduction (16 marks) | Sexual reproduction in flowering plants: Flower structure, male and female gametophytes, pollination, outbreeding devices | 16 marks |
| Week 2 | Reproduction (Cont.) | Double fertilisation, post-fertilisation events, development of seed and fruit, apomixis, parthenocarpy, polyembryony | ||
| Week 3 | Human Reproduction | Male and female reproductive systems, gametogenesis, menstrual cycle, fertilisation, blastocyst formation | ||
| Week 4 | Human Reproduction (Cont.) & Reproductive Health | Pregnancy, placenta formation, parturition, lactation, prevention of STDs, birth control methods, amniocentesis, infertility | ||
| Month 2 | Week 5 | Genetics and Evolution (15 marks) | Mendelian inheritance, deviations (incomplete dominance, co-dominance), multiple alleles, blood group inheritance | 15 marks |
| Week 6 | Genetics and Evolution (Cont.) | Chromosomal theory, sex determination, linkage, crossing over, sex-linked inheritance, Mendelian & chromosomal disorders | ||
| Week 7 | Molecular Basis of Inheritance | Structure of DNA/RNA, DNA packaging, replication, transcription, genetic code, translation, gene regulation (lac operon) | ||
| Week 8 | Molecular Basis of Inheritance (Cont.) & Evolution | DNA fingerprinting, human/rice genome projects, evolution, Darwin’s theory, modern synthetic theory | ||
| Month 3 | Week 9 | Evolution (Cont.) | Mechanism of evolution (mutation, recombination, natural selection), gene flow, genetic drift, Hardy-Weinberg principle | |
| Week 10 | Biology and Human Welfare (14 marks) | Pathogens causing diseases, immunology, vaccines, cancer, HIV/AIDS, drug/alcohol abuse in adolescence | 14 marks | |
| Week 11 | Microbes in Human Welfare | Role of microbes in food processing, industrial production, sewage treatment, biocontrol agents, biofertilisers, antibiotics | ||
| Week 12 | Revision | Focused revision on Reproduction and Genetics | ||
| Month 4 | Week 13 | Biotechnology (10 marks) | Genetic engineering (recombinant DNA technology) | 10 marks |
| Week 14 | Biotechnology and Its Applications | Applications in health/agriculture: human insulin, vaccine production, stem cell technology, GMOs, biosafety issues | ||
| Week 15 | Ecology and Environment (15 marks) | Population interactions (mutualism, competition, predation), population attributes, growth, birth rate, death rate | 15 marks | |
| Week 16 | Ecosystem | Components of ecosystem, productivity, decomposition, energy flow, pyramids of number, biomass, and energy | ||
| Month 5 | Week 17 | Biodiversity and Its Conservation | Concept and importance of biodiversity, loss of biodiversity, conservation: hotspots, endangered species, biosphere reserves | |
| Week 18 | Revision | Genetics and Biotechnology - practice and review key concepts | ||
| Week 19 | Revision | Human Welfare and Ecology - focus on diseases, microbes, population, and biodiversity | ||
| Week 20 | Final Revision and Mock Tests | Solve past papers, practice sample questions, and focus on weak areas |
| Download ISC Class 12 Biology 5 Month Study Plan 2024-25 PDF |
This table organises the study plan, allowing for a structured, efficient approach to cover all topics according to their importance in the syllabus.
ISC Exam Dates 2025
The ISC Class 12 Board Exams for 2025 are expected to take place from 21st February to 28th March 2025. The detailed subject-wise timetable is likely to be released by December 2024. Practical exam dates will be announced after the theory timetable is issued, and schools will schedule practicals according to the board's guidelines.
Exam start times will be either 9:00 AM or 11:00 AM, depending on the subject, and each exam will last 2 to 3 hours, with an extra 15 minutes for reading the question paper.
Students are advised to regularly check the official CISCE website for the latest updates and notifications.
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