NCERT Solutions for Class 12 Biology (Chapter wise PDFs)

Edited By Irshad Anwar | Updated on Mar 30, 2025 02:34 PM IST

NCERT Solutions for Class 12 Biology come in very handy to students who are willing to achieve good scores in exams. The solutions explain complex concepts in simple words, as per the CBSE syllabus. NCERT Solutions for Class 12. explain important topics like reproduction, genetics, and ecology, which help students to study and memorize what they study. With accurate answers, diagrams, and simple language, these answers make the students understand biology thoroughly and achieve excellent grades in exams.

This Story also Contains

Biology Solutions For Class 12
Overview of NCERT Biology Class 12
Units and Chapters
Marking Scheme for Class 12 Biology
Key Features of NCERT Solutions
Importance of NCERT Solutions

NCERT Solutions for Class 12 Biology (Chapter wise PDFs)

These worked-out answers are very useful during learning processes like sexual and asexual reproduction, fertilization, and genetic inheritance. They break complex ideas into smaller pieces, making learning easy. Learning with NCERT solutions can help students prepare for examinations like NEET as they focus on important explanations and practice questions. The explanations worked out every day boost confidence and problem-solving skills, and help students respond to questions during exams confidently.

Biology Solutions For Class 12

NCERT Class 12 biology solutions are provided for 16 chapters. Along with NCERT solutions, students can use CBSE Revision Notes to exercise problems and CBSE previous year papers for board exam preparation.

The following are the links to download the PDF for all chapters:

Chapter 1: Sexual Reproduction in Flowering Plants

Chapter 2: Human Reproduction

Chapter 3: Reproductive Health

Chapter 4: Principles of Inheritance and Variation

Chapter 5: Molecular Basis of Inheritance

Chapter 6: Evolution

Chapter 7: Human Health and Disease

Chapter 8: Microbes in Human Welfare

Chapter 9: Biotechnology: Principles and Processes

Chapter 10: Biotechnology and its Applications

Chapter 11: Organisms and Populations

Chapter 12: Ecosystem

Chapter 13: Biodiversity and Conservation

Important Topics under Class 12 Biology NCERT Solutions PDFs

The Biology book for 12th standard provides detailed explanations of significant concepts like Reproduction, Inheritance, Evolution, Food production, Biotechnology, Ecosystems, Biodiversity, etc. The below-listed topics from the the book are considered the most scoring topics from the board and competitive exam perspectives.

Genetics
Evolution
Biotechnology
Reproduction
Microbes in Human Welfare

The following chapters from the NCERT Class 12 Biology textbook 2023–24 have been deleted:

For more, check NCERT Class 12 Books: Access and Download

Overview of NCERT Biology Class 12

Class 12 NCERT Biology textbook has five units of study encompassing a vast variety of subjects that include topics related to reproduction, genetics and biology of genes. The units of study have well-designed chapters meant to provide a thorough understanding of biology concepts important in both the board exam as well as for other competitive exams, including NEET.

NCERT Solutions for Class 12 Subject-wise

Units and Chapters

Unit VI: Reproduction

Chapter 1: Reproduction in Organisms

Covers sexual and asexual reproduction methods.
Exercise includes 18 questions.

Chapter 2: Sexual Reproduction in Flowering Plants

Focuses on sexual reproduction in angiosperms.
Includes five subtopics and covers phases of fertilization.

Chapter 3: Human Reproduction

Explains human reproductive systems and processes.
Includes 21 questions in the exercise.

Chapter 4: Reproductive Health

Discusses health aspects related to reproduction.
Covers topics like birth control and STDs.
Exercise includes 12 questions.

Unit VII: Genetics and Evolution

Chapter 5: Principles of Inheritance and Variation

Deals with principles controlling character expression.
Exercise includes 16 questions.

Chapter 6: Molecular Basis of Inheritance

Covers DNA replication, transcription, translation, and genetic code.
Includes about 14 questions in the exercise.

Chapter 7: Evolution

Explores theories and mechanisms of evolution.
Includes 10 questions.

Unit VIII: Biology and Human Welfare

Chapter 8: Human Health and Diseases

Discusses types of diseases and the immune system.
Covers drug abuse and diseases like AIDS and cancer.

Chapter 9: Strategies for Enhancement in Food Production

Focuses on plant and animal breeding techniques.
Includes 15 questions in the exercise.

Chapter 10: Microbes in Human Welfare

Highlights the role of microorganisms in human welfare.

Unit IX: Biotechnology and Its Applications

Chapter 11: Biotechnology: Principles and Processes

Introduces recombinant DNA technology.
Includes 12 questions.

Chapter 12: Biotechnology and Its Applications

Explores applications in food, medicine, and transgenic animals.

Unit X: Ecology and Environment

Chapter 13: Organisms and Populations

Covers population characteristics and interactions.
Exercise includes 17 questions.

Chapter 14: Ecosystem

Discusses ecosystem structures, functions, and services.

Chapter 15: Biodiversity and Conservation

Focuses on biodiversity types and conservation measures.

Chapter 16: Environmental Issues

Addresses pollution, global warming, and other environmental issues.

Marking Scheme for Class 12 Biology

The marking scheme is given as follows:

Unit Title	Marks
VI. Reproduction	16
VII. Genetics and Evolution	20
VIII. Biology and Human Welfare	12
IX. Biotechnology and Its Applications	12
X. Ecology and Environment	10

Key Features of NCERT Solutions

Simple Language: Solutions are described in simple language for better comprehension.
Pointed Answers: Points are used to frame answers to enable quick comprehension.
New Syllabus: Solutions are aligned with the newest CBSE syllabus.
For Medical Entrance Exams: Effective for NEET and other medical entrance exams.
Free from Technical Terms: Principles are explained free from technical terms.

Importance of NCERT Solutions

NCERT solutions are of utmost significance to practice for board exams as well as competitive exams. They provide elaborate details regarding NCERT textbook questions and prepare students to tackle questions with the right mindset. It is essential to solve NCERT exercises in order to obtain high marks in exams.

NCERT Class-wise Solutions

We hope that NCERT Solutions for Class 12 Biology will help you in your board and competitive exams.

Frequently Asked Questions (FAQs)

1. Are the NCERT Solutions for Class 12 Biology reliable?

Yes, these NCERT solutions are solved by subject matter experts. So you can completely rely on the solutions.

2. How many chapters are there in the NCERT book for Class 12 Biology?

There are a total of 16 chapters in Class 12 Biology.

3. Will the questions in Board exams be directly asked from the NCERT book?

No, the questions will only be based on the NCERT book.

4. Which book is best for Class 12 Biology?

NCERT Biology Textbook is considered to be the best book for the Class 12 exam. This book adheres closely to the CBSE curriculum. Since the question papers are based on the prescribed CBSE syllabus for the subject, it serves as a good starting point for preparation for board exams.

5. How do NCERT Solutions of Class 12 Biology help in exam preparation?

The NCERT textbook questions are a great resource for helping students study in-depth and perform well on exams and tests. Students can begin studying the NCERT Solutions Class 12 Biology with efficiency, which will result in improved performance in subsequent coursework. In turn, this would help students gain a firm grasp of the curriculum.

6. How to download NCERT Solutions for Class 12 Biology?

Visit the Careers360 website and select NCERT Solutions, or go to the link https://school.careers360.com/ncert/ncert-solutions and go to NCERT solutions for class 12 biology and view/download the solutions. You may need to register yourself before downloading, which is also free. So, just go for it, as all concepts are covered in-depth in these solutions.

7. Does careers360 provide free NCERT Biology Solutions for Class 12?

Yes, you can view and download these solutions in PDF format for free. Students can access PDF solutions if they have trouble figuring out the exercises' questions in the NCERT textbook. Our experts provide the best answers to the questions so that students can prepare for exams more easily.

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Popular Questions

A block of mass 0.50 kg is moving with a speed of 2.00 ms^-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

Option 1) $0.34\; J$	Option 2) $0.16\; J$
Option 3) $1.00\; J$	Option 4) $0.67\; J$

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times. Assume that the potential energy lost each time he lowers the mass is dissipated. How much fat will he use up considering the work done only when the weight is lifted up ? Fat supplies 3.8×10⁷J of energy per kg which is converted to mechanical energy with a 20% efficiency rate. Take g = 9.8 ms⁻² :

Option 1)

2.45×10⁻³ kg

Option 2)

6.45×10⁻³ kg

Option 3)

9.89×10⁻³ kg

Option 4)

12.89×10⁻³ kg

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Option 1) $2,000 \; J - 5,000\; J$	Option 2) $200 \, \, J - 500 \, \, J$
Option 3) $2\times 10^{5}J-3\times 10^{5}J$	Option 4) $20,000 \, \, J - 50,000 \, \, J$

A particle is projected at 60⁰ to the horizontal with a kinetic energy $K$ . The kinetic energy at the highest point

Option 1) $K/2\,$	Option 2) $\; K\;$
Option 3) $zero\;$	Option 4) $K/4$

In the reaction,

$2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}$

Option 1) $11.2\, L\, H_{2(g)}$ at STP is produced for every mole $HCL_{(aq)}$ consumed	Option 2) $6L\, HCl_{(aq)}$ is consumed for ever $3L\, H_{2(g)}$ produced
Option 3) $33.6 L\, H_{2(g)}$ is produced regardless of temperature and pressure for every mole Al that reacts	Option 4) $67.2\, L\, H_{2(g)}$ at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, $Mg_{3}(PO_{4})_{2}$ will contain 0.25 mole of oxygen atoms?

Option 1) 0.02	Option 2) 3.125 × 10^-2
Option 3) 1.25 × 10^-2	Option 4) 2.5 × 10^-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Option 1) decrease twice	Option 2) increase two fold
Option 3) remain unchanged	Option 4) be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

Option 1) Molality	Option 2) Weight fraction of solute
Option 3) Fraction of solute present in water	Option 4) Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol^-1) is

Option 1) twice that in 60 g carbon	Option 2) 6.023 × 10²²
Option 3) half that in 8 g He	Option 4) 558.5 × 6.023 × 10²³

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t²) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m² , the number of rotations made by the pulley before its direction of motion if reversed, is