Plan right and execute well
Consolidate all the knowledge you have been receiving in school for Class 12 biology
So, we have entered the last trimester of Class 12. It is not only the board exams which are approaching. It is the beginning of a new journey which is going to take you to your bright and brilliant future. Now is the time to consolidate all the knowledge which you have been gathering day after day sitting in your classrooms. Right planning and proper execution is very crucial to score well.
There are 16 chapters, arranged in five units, in the Class 12 biology syllabus. Marks allocation to different units is as: Unit I - reproduction, 14 marks Unit II - genetics and evolution, 18 marks, Unit III - biology in human welfare, 14 marks Unit IV - biotechnology, 10 marks Unit V - ecology, 14 marks From this year, there will be value-based questions worth three or five marks.
While preparing for your boards, go unit-wise. Prepare all the chapters of each unit together as they are related. As unit II carries the maximum marks, my suggestion is that you start your preparation from this one. All the three chapters of this unit are very important. In the first chapter, principles and processes of inheritance, study very thoroughly both the laws of inheritance and how to explain them with the help of monohybrid and dihybrid cross. Sex-linked inheritance as well as autosomal and sex-linked diseases are other important topics of this chapter. In molecular basis of inheritance, various experiments like Griffith’s experiment, Harshey and Chase, Meselson and Stahl’s experiment and their diagrams are important. This entire chapter is very important, so prepare thoroughly. From evolution, in addition to origin of life (including Miller and Urey’s experiment) lay special emphasis on natural selection, Hardy-Weinberg principle and adaptive radiation.
Unit IV is related to unit II so after unit II pick unit IV. There are just two chapters in this unit but both are very important. In unit I, chapter two and three are more important than chapter one and four. Spermatogenesis, oogenesis, hormonal control of MRS and FRS, menstrual cycle, microsporogenesis, megasporogenesis, double fertilisation, triple fusion and apomixes, methods of birth control are some of the very important topics of this unit. In unit III, innate and acquired immunity active and passive immunity, T and B lymphocytes, humoral and cell mediated immunity, cancer, and AIDS are important topics. You should also be well versed in hybrid varieties of plants and animals and diseases they are resistant to. In Ecology, S and J-shaped population growth, interactions among organisms, productivity, succession, ecological pyramids, sewage treatment, biomagnifications, eutrophication and pollution are some important topics.
The entire paper will be from the NCERT book. So, read every word of it.