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NCERT Solutions for Class 12 Biology Free PDF Download

NCERT Solutions for Class 12 Biology

Biology is basically a natural science that studies life and leaving organism like their physical structure, chemical process molecular interactions, physiological mechanism development, and evolution. NCERT solutions for class 12 Biology are very beneficial to grasp the concepts in a structured, easy to digest manner and enhance better theoretical and analytical skills that are essential in different exams. This contains step by step and logically arranged solutions.

Our NCERT solutions of class 12 Biology is an insurance of a smooth sail whenever you need to clarify the solution to any question. The best biology expertise teachers prepared and reviewed the NCERT solution for class 12 Biology.

Download NCERT Solutions of other subjects of Class 12 here.

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NCERT Solutions for Class 12 Biology Chapterwise

Chapter 1: Reproduction in Organisms

Chapter 2: Sexual Reproduction in Flowering Plants

Chapter 3: Human Reproduction

Chapter 4: Reproductive Health

Chapter 5: Principles of Inheritance and Variation

Chapter 6: Molecular Basis of Inheritance

Chapter 7: Evolution

Chapter 8: Human Health and Disease

Chapter 9: Strategies for Enhancement in Food Production

Chapter 10: Microbes in Human Welfare

Chapter 11: Biotechnology Principles and Processes

Chapter 12: Biotechnology and its Applications

Chapter 13: Organisms and Populations

Chapter 14: Ecosystem

Chapter 15: Biodiversity and Conservation

Chapter 16: Environmental Issues

NCERT Solutions for class 12 biology

Class 12 Biology NCERT Chapterwise Solutions

NCERT Solutions for Class 12 Biology Chapter 1 Reproduction in Organisms

Reproduction is a biological process of formation of new offspring from the pre-existing organism. It becomes a vital process without which species cannot survive for long. It ensures continuity of species generation after generations. Download NCERT Solutions for reproduction in organisms here.

NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants

Reproduction ensures continuity of species generation, as the older individuals undergo senescence and die. Flowering plants show the sexual mode of reproduction with complex reproductive units. Download NCERT Solutions for sexual reproduction in flowering plants here.

NCERT Solutions for Class 12 Biology Chapter 3 Human Reproduction

The reproductive events in humans include the formation of gametes i.e., sperms in males and ovum in females. This is followed by the formation and development of blastocyst. Download NCERT Solutions for human reproduction here.

NCERT Solutions for Class 12 Biology Chapter 4 Reproductive Health

Reproductive health means total well-being in all aspects of reproduction, which means physical, emotional, behavioral and social. Download NCERT Solutions for Reproductive health here.

NCERT Solutions for Class 12 Biology Chapter 5 Principles of Inheritance and Variation

Genetics is the study of principles of heredity and variation. Inheritance is the process to pass characters from parents to progeny. Download NCERT Solutions for principles of inheritance and variation here.

NCERT Solutions for Class 12 Biology Chapter 6 Molecular Basis of Inheritance

DNA and RNA are two types of nucleic acid found in living organisms. DNA acts as genetic material in the organisms. RNA acts as genetic material in some organisms as in some viruses. Download NCERT Solutions for Molecular Basis of Inheritance here.

NCERT Solutions for Class 12 Biology Chapter 7 Evolution

Evolution is the study of the history of life forms on earth and includes life on earth, different changes in flora and fauna around the earth. Download NCERT Solutions for Evolution here.

NCERT Solutions for Class 12 Biology Chapter 8 Human Health and Disease

Health is the state of complete physical, mental and social well beings of all entities and it is affected by genetic disorders, Infection, and lifestyle. Download NCERT Solutions for Human Health and Disease here.

NCERT Solutions for Class 12 Biology Chapter 9 Strategies for Enhancement in Food Production

Biological principles such as animal husbandry and plant breeding are used to fulfill the demand of food items due to the increasing population. Download NCERT Solutions for Strategies for Enhancement in Food Production here.

NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare

Microbes are diverse-protozoa, bacteria, fungi and microscopic plants viruses, viroid and also prions that are proteinaceous infectious agents. They exist everywhere on earth. Download NCERT Solutions for Microbes in Human Welfare here.

NCERT Solutions for Class 12 Biology Chapter 11 Biotechnology Principles and Processes

This technique is used to produce products and processes useful to humans. For example processes like in vitro fertilization leading to ‘test-tube’ baby. Download NCERT Solutions for Biotechnology Principles and Processes here.

NCERT Solutions for Class 12 Biology Chapter 12 Biotechnology and its Applications

Biotechnology deals with industrial-scale production of biopharmaceuticals. This application includes therapeutics, diagnostics, and genetically modified crops for agriculture and processed food, etc. Download NCERT Solutions for Biotechnology and its Applications here.

NCERT Solutions for Class 12 Biology Chapter 13 Organisms and Populations

Ecology is the branch of biology which deals with the interactions among organisms and between the organism and its physical environment. Its study is important to strike a balance between the development and maintenance of natural environments. Download NCERT Solutions for Organisms and Populations here.

NCERT Solutions for Class 12 Biology Chapter 14 Ecosystem

The ecosystem is the unit of nature where living organisms interact among themselves as well as with the surroundings. Download NCERT Solutions for Ecosystem here.

NCERT Solutions for Class 12 Biology Chapter 15 Biodiversity and Conservation

Biodiversity is the occurrence of different types of ecosystems, different species of organisms and their variants. The vast array of species of micro-organisms includes algae, fungi, plants, etc. Download NCERT Solutions for Biodiversity and Conservation here.

NCERT Solutions for Class 12 Biology Chapter 16 Environmental Issues

Due to increase in population, demands for food, shelter, water, electricity, roads, and automobiles are increasing very fast. Everywhere in the world, people are facing problems like pollution, greenhouse effect, ozone depletion, deforestation, etc. Download NCERT Solutions for Environmental Issues here.

Solved Questions for You

Question 1: Attempt giving a clear definition of the term species.

Answer: A group of organisms which have the ability to interbreed and produce fertile offspring are called as species. The member of species does not breed with members of other species.

Question 2: Describe one example of adaptive radiation.

Answer:  Diversification of ancestral line into different forms which in turn occupy diverse ecological niche is referred to as adaptive radiation. For example, the ancestral seed-eating stock of Darwin’s finches diversified based on different types of food that were (plants, seeds, insects, cactus etc) available The of beak adapted to that food and got modified accordingly. The geographical isolation led reproductive isolation and thus, the evolution of new species of finches from the parental stock.

Question 3: What do you think is the significance of reproductive health in a society?

Answer:  Reproductive health in a society helps to prevent the spread of various sexually transmitted diseases and impart the ability to produce offspring carrying better survival rates. Sex education helps in maintaining the population size and to avoid unwanted pregnancies.

Question 4: Is the use of contraceptives justified? Give reasons.

Answer:  Yes, the use of contraceptives is justified due to the following reasons:

1) Contraceptive devices help in reducing unwanted pregnancies, which reduces increased birth rate and hence, checks population explosion.

2) Contraceptives provide an option for planning the family by spacing the pregnancies and avoiding unwanted pregnancies.

3) Contraceptives also prevent the incidence of sexually-transmitted diseases, AIDS etc. to some extent.

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