Class 12 Biology Sample Papers, Notes & Important Questions

If you are looking for Class 12 Biology model papers, periodic test papers, Important Questions, MCQ Questions, Sample Papers, Study Notes, Hot Questions, Worksheets, Class Assignments, Practice Exercises, Word Problems, Previous Year question papers, Solved papers, Unit tests and other related study material for exam preparation then you are at the right place.

Total Papers : 69

Total Papers : 69

Question bank of Class 12

On Ribblu one can get immense collections of CBSE Question Bank for Class 12 Biology which includes important questions 12th Class Chapter wise as per NCERT syllabus. Students while preparing for final exams must practice all the important questions of 12th grade Biology. All these Important Questions chapter wise have been uploaded by various registered users.

Question bank of Class 12 Biology

Sample Papers of Class 12

By Solving CBSE Sample Papers for Class 12 Biology, immensely helps students in preparing for the final exams. These Class 12 sample papers and 12th grade sample question papers are prepared in accordance with the latest syllabus and guidelines that are issued by the central board. If one wants to have a clear idea of how the final exam papers would be in terms of level of difficulty, time and other aspects then, all students must make sure that they do sample papers once their course revision is finished.

Sample Papers of Class 12 Biology

Revision Notes of Class 12

CBSE Revision Notes For Class 12 Biology are very important for quick revision to recall all that has been learned throughout the year. On one can find Study Key Notes or Revision notes for all subjects of 12th Class STD and which includes Biology as per CBSE and NCERT syllabus. Notes make this process of recall easy. One can easily revise the precise notes in a day or two. Once they get the hint, the students are quick to recall the entire material.

Revision Notes of Class 12 Biology

Question Papers of Class 12

If you are looking for CBSE Question Papers for Class 12 Biology then you are at the right place. On Ribblu you will find Class 12 Biology Question Papers, 12th class previous year board question papers and MCQs Paper for Class 12 Biology, as per NCERT Syllabus. Solving them gives students the clear idea of how the final exam papers would be in terms of level of difficulty, time and other aspects, so all students must attempt as many Biology Question Papers as possible once their course revision is finished so as to get the best score in final exams

Question Papers of Class 12 Biology

Supplementary Helping Aids For CBSE Exams Preparation.

Indian Education system primarily consists of two parts one being studying the subjects and the other one is appearing for exams and tests. All these exams are conducted by schools for various classes to gauge how much the students have understood , learned and what is their capability score in any particular subject. But sometimes even after understanding the topics fully there are chances the students don’t do well in exams because of lack of preparation from the examination perspective. The reason being that one needs to prepare for exams in a particular way and for that previous question papers, sample papers, worksheets and unit test papers play a major role.

The important factors in performing well in the exams, apart from, studying day & night, grasping everything and retaining everything, is, to be able to study smart and in a proper disciplined manner, so that all the efforts translate into performance.

When preparing for your exams every expert recommends that students should invest more time and effort into solving question papers and worksheets from previous year

This practice not only will familiarise the students with the format of the question paper, it will also teach them the discipline of answering the entire question paper within the time allotted to you at the examination. The more one solves these, the more confidence will be gained towards achievement of highest score. Often it happens that in the exams the children know the solution of every question but due to lack of time they miss some portions. So it is imperative to practice before hand so that everything is attempted on time in main exams

Class 12 Biology Term Wise Syllabus

Term I

Orientation and Recapitulation: Discussion on importance of Biology, scope of Biology and other topics of interest.

Unit-VI Reproduction

Chapter-1: Reproduction in Organism

Reproduction, a characteristic feature of all organisms for continuation of species; modes of reproduction- asexual and sexual reproduction; asexual reproduction - Binary fission, Sporulation, budding, gemmule formation, fragmentation; vegetative propagation in plants.

Chapter-2: Sexual Reproduction in Flowering Plants

Flower structure; development of male and female gametophytes; pollination - types, agencies and examples; outbreeding devices; pollen-pistil interaction; double fertilization; post fertilization events - development of endosperm and embryo, development of seed and formation of fruit; special modes- apomixis, parthenocarpy, polyembryony; Significance of seed dispersal and fruit formation.

Chapter-3: Human Reproduction

Male and female reproductive systems microscopic anatomy of testis and ovary; gametogenesis - spermatogenesis and oogenesis; menstrual cycle; fertilisation, embryo development up to blastocyst formation, implantation; pregnancy and placenta formation (elementary idea);parturition (elementary idea); lactation (elementary idea).

Practical 1: Flowers adapted to pollination by different agencies (wind, insects,birds).

Practical 2: Controlled pollination -emasculation, tagging and bagging.

Practical 3: Study pollen germination on a slide.

Chapter-4: Reproductive Health

Need for reproductive health and prevention of Sexually Transmitted Diseases (STDs); birth control - need and methods, contraception and medical termination of pregnancy (MTP); amniocentesis; infertility and assisted reproductive technologies - IVF, ZIFT, GIFT (elementary idea for general awareness).

Practical 1: Identification of stages of gamete development, i.e., T.S. of testis and T.S. of ovary through permanent slides (from grasshopper/mice).

Practical 2: T.S. of blastula through permanent slides (Mammalian).

Revision Test from Unit VI Reproduction

Project: Investigatory Project (on any topic of interest) during summer vacations


Unit-VII Genetics and Evolution

Chapter-5: Principles of Inheritance and Variation

Heredity and variation: Mendelian inheritance; deviations from Mendelism – incomplete dominance, co- dominance, multiple alleles and inheritance of blood groups, pleiotropy; elementary idea of polygenic inheritance; chromosome theory of inheritance; chromosomes and genes; Sex determination - in humans, birds and honey bee; linkage and crossing over; sex linked inheritance - haemophilia, colour blindness; Mendelian disorders in humans - thalassemia;chromosomal disorders in humans; Down's syndrome, Turner's and Klinefelter's syndromes.

Chapter-6: Molecular Basis of Inheritance

Search for genetic material and DNA as genetic material; Structure of DNA and RNA; DNA packaging; DNA replication; Central dogma; transcription, genetic code, translation; gene expression and regulation -lacoperon; genome and human and rice genome projects; DNA fingerprinting.

Chapter-7: Evolution

Origin of life; biological evolution and evidences for biological evolution (paleontology, comparative anatomy, embryology and molecular evidences); Darwin's contribution, modern synthetic theory of evolution; mechanism of evolution - variation (mutation and recombination) and natural selection with examples, types of natural selection; Gene flow and genetic drift; Hardy - Weinberg's principle; adaptive radiation; human evolution.

Practical 1: Mendelianinheritance using seeds of different colour/sizes of any plant.

Practical 2: Prepared pedigree charts of any one of the genetic traits such as rolling of tongue, blood groups, ear lobes, widow's peak and colour blindness.

Practical 3: Prepare a temporary mount of onion root tip to study mitosis.

Practical 4: Meiosis in onion bud cell or grasshopper testis through permanent slides.


Unit-VIII Biology and Human Welfare

Chapter 8: Human Health and Diseases

Pathogens; parasites causing human diseases (malaria, dengue, chickengunia, filariasis, ascariasis, typhoid, pneumonia, common cold, amoebiasis, ring worm) and their control; Basic concepts of immunology - vaccines; cancer, HIV and AIDS; Adolescence -drug and alcohol abuse.

Chapter-9: Strategies for Enhancement in Food Production

Improvement in food production: Plant breeding, tissue culture, single cell protein,Biofortification, Apiculture and Animal husbandry.

Chapter-10: Microbes in Human Welfare

In household food processing, industrial production, sewage treatment, energy generation and microbes as biocontrol agents and bio-fertilizers. Antibiotics; production and judicious use.

Practical 1: Common disease causing organisms like Ascaris, Entamoeba, Plasmodium, any fungus causing ringworm through permanent slides or specimens. Comment on symptoms of diseases that they cause. 2. Two plants and two animals (models/virtual images) found in xeric conditions. Comment upon their morphological adaptations.

Revision and Test from UNIT-VIII(Biology in Human Welfare)

Unit-IX Biotechnology and Its Applications

Chapter-11: Biotechnology - Principles and processes

Genetic Engineering (Recombinant DNA Technology).

Chapter-12: Biotechnology and its Application

Application of biotechnology in health and agriculture: Human insulin and vaccine production, stem cell technology, gene therapy; genetically modified organisms - Bt crops; transgenic animals; biosafety issues, bio piracy and patents.

Practical 1:Isolate DNA from available plant material such as spinach, green pea seeds, papaya, etc.

Revision and Test from Unit-IX(Biotechnology)

Term II

Unit-X: Ecology and Environment

Chapter-13: Organisms and Populations

Organisms and environment: Habitat and niche, population and ecological adaptations; population interactions - mutualism, competition, predation, parasitism; population attributes - growth, birth rate and death rate, age distribution

Chapter-14: Ecosystem

Ecosystems: Patterns, components; productivity and decomposition; energy flow; pyramids of number, biomass, energy; nutrient cycles (carbon and phosphorous); ecological succession; ecological services carbon fixation, pollination, seed dispersal, oxygen release (in brief).

Chapter-15: Biodiversity and its Conservation

Biodiversity-Concept, patterns, importance; loss of biodiversity; biodiversity conservation; hotspots, endangered organisms, extinction, Red Data Book, biosphere reserves, national parks, sanctuaries and Ramsar sites.

Practicals 1: Collect and study soil from at least two different sites and study them for texture, moisture content, pH and water holding capacity. Correlate with the kinds of plants found in them.

Practicals 2:Collect water from two different water bodies around you and study them for pH, clarity and presence of any living organism.

Chapter-16: Environmental Issues

Air pollution and its control; water pollution and its control; agrochemicals and their effects; solid wastemanagement; radioactive waste management; greenhouse effect and climate change impact and mitigation; ozone layer depletion; deforestation; any one case study as success story addressing environmental issue(s).

Revision and Test from UNIT-X Ecology(Chapter 13-16)

Practicals 1: Study the presence of suspended particulate matter in air at two widely different sites.

Practical 2: Study the plant population density by quadrat method.

Practical 3: Study the plant population frequency by quadrat method.

Practical 4: Study the effect of different temperatures and three different pH on the activity of salivary amylase on starch.

Practical 5: Two plants and two animals (models/virtual images) found in aquatic conditions. Comment upon their morphological adaptations.

PROJECT: Submission of Project Report

Revision of Unit -VI to X andrelated practicals

Common Pre- Board Examination


Biology Question Paper Design

Typology of Questions

Remembering-(Knowledge based Simple recall questions, to know specific facts, terms, concepts, principles, or theories, identity, define or recite, information)

Number of Questions Asked that are Very Short Answer type Questions = 2

Number of Questions Asked that are Short Answer Type Questions = 2

Number of Questions Asked that are Long Answer Type Questions = 0

Total Marks = 7

Total Weightage = 10%

Typology of Questions

Understanding-(Comprehension - To be familiar with meaning and to understand conceptually, interpret, compare, contrast, explain, paraphrase information)

Number of Questions Asked that are Very Short Answer type Questions = 0

Number of Questions Asked that are Short Answer Type Questions = 6

Number of Questions Asked that are Long Answer Type Questions = 1

Total Marks = 21

Total Weightage = 30%

Typology of Questions

Application (Use abstract information in concrete situation, to apply knowledge to new situations. Use given content to interpret a situation, provide and example, or solve a problem)

Number of Questions Asked that are Very Short Answer type Questions = 0

Number of Questions Asked that are Short Answer Type Questions = 6

Number of Questions Asked that are Long Answer Type Questions = 1

Total Marks = 21

Total Weightage = 30%

Typology of Questions

Evaluating & Analysis - (Classify, Compare, Contrast, or differentiate between different pieces of information, Organize and/or integrate unique pieces of information from a variety of sources)

Number of Questions Asked that are Very Short Answer type Questions = 2

Number of Questions Asked that are Short Answer Type Questions = 2

Number of Questions Asked that are Long Answer Type Questions = 1

Total Marks = 12

Total Weightage = 17%

Typology of Questions

Creating - (Appraise, judge, and/or justify the value or worth of a decision or outcome, or to predict outcomes based on values)

Number of Questions Asked that are Very Short Answer type Questions = 1

Number of Questions Asked that are Short Answer Type Questions = 3

Number of Questions Asked that are Long Answer Type Questions = 0

Total Marks = 9

Total Weightage = 13%

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