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NCERT Solutions for Class 12 Biology (Chapter wise PDFs)

NCERT Solutions for Class 12 Biology (Chapter wise PDFs)

Edited By Irshad Anwar | Updated on May 10, 2024 05:43 PM IST

NCERT Solutions for Class 12 Biology (Chapter wise PDFs)

NCERT Solutions for Class 12 Biology are the solutions to the exercises in chapters 1 to 16. The National Council of Education and Training (NCERT) has established a curriculum for those schools that adhere to the Central Board of Secondary Education (CBSE). biology NCERT solutions for Class 12 are curated in accordance with the latest CBSE syllabus. Our carefully crafted CBSE Class 12 Biology NCERT Solutions in English are created with the goal of interpreting ideas in a way that the students can understand. Download the NCERT solutions, Class 12, Biology, All Chapters PDF to use offline anywhere. Students must go through each chapter in CBSE Class 12 Solutions Biology in the easiest and most effective way possible with the help of NCERT Solutions for Class 12.

NCERT Solutions for Class 12 Biology (Chapter wise PDFs)
NCERT Solutions for Class 12 Biology (Chapter wise PDFs)

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.

Following are the links to the Biology Class 12 Solutions PDF download for all chapters:

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

Important Topics under Class 12 Biology NCERT Solutions PDFs

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

  • Genetics
  • Evolution
  • Biotechnology
  • Reproduction
  • Microbes in Human Welfare

Chapter Details For Biology Class 12 NCERT Solutions

Chapter 1 Reproduction in Organisms

Reproduction in organisms is the first chapter of NCERT textbook of Class 12 biology. This chapter mainly deals with the methods of reproduction in different organisms. In the NCERT Class 12 Biology solutions, you will study two types of reproduction methods: sexual reproduction and asexual reproduction. At the end of the chapter, the exercise is given with a total of 18 questions.

Chapter 2 Sexual Reproduction in Flowering Plants

The second chapter of NCERT Biology Class 12 is on sexual reproduction in flowering plants. You will learn about sexual reproduction in angiosperm plants. The chapter has a total of five subtopics. Different phases of fertilization will also be covered here. The questions to test your knowledge are given in the exercise at the end of the chapter.

Chapter 3 Human Reproduction

Human reproduction is the topic in the third chapter, which explains the process of sexual reproduction in humans. In this chapter, you will become familiar with the male and female reproductive systems of humans. and also study the menstrual cycle and different stages of pregnancy. The NCERT exercises given in chapter 3 consists of a total of 21 questions. If you are able to write correct Solutions for NCERT Class 12 biology, then surely you can excel in CBSE board exams.

Chapter 4 Reproductive Health

The fourth chapter is on reproductive health, and this chapter deals with all the reproduction-related health aspects in humans. A total of five sub-topics are taught, based on which 12 questions are asked at the end of the chapter. In this chapter, you will study a few important topics like birth control, sexually transmitted diseases, and the solution to infertility. You must practice the questions mentioned in the NCERT book while preparing for the 12th board exam. CBSE NCERT solutions for class 12 biology will also help you out with the correct answers.

Chapter 5 Principles of Inheritance and Variation

Principles of inheritance and variation is the first chapter of the second unit of the NCERT Textbook Class 12 Biology. In this chapter, you will get to know about the various principles and phenomena that control the expression of different characters in organisms. At the end of this chapter, you will find 16 questions based on the topics taught. Before attempting board exams, you must practice these NCERT questions because practice will make you perfect.

Chapter 6 Molecular Basis of Inheritance

The molecular basis of inheritance is the topic dealt with in this lesson. In addition, you will study processes like DNA replication, transcription, and translation. You will also learn about the genetic code and new areas of research such as DNA fingerprinting and the human genome project. Solve the NCERT exercise, which consists of around 14 questions, and write the correct Solutions for NCERT Class 12 Biology in your board exams.

Chapter 7 Evolution

The chapter Evolution in Biology Class 12 deals with evolutionary science. In this chapter, you will study the theories and evidence suggesting evolution. You will also learn the mechanisms that cause evolution in nature. This chapter will tell you about adaptive radiation, biological evolution, and their mechanisms. In the end, you will gain knowledge about how humans evolved. The 10 questions given at the end of the chapter, must be tried in order to get an understanding of all the concepts.

Chapter 8 Human Health and Diseases

The chapter on human health and diseases in NCERT Biology Class 12 deals with the various types of diseases and how they can be controlled. It also talks about the immune system and immunity in humans. In this chapter, you will also learn about the effects of drug/alcohol abuse on youngsters. This chapter will also tell you about deadly diseases like AIDS and cancer. Try solving the NCERT exercise at the end of the chapter and write the correct NCERT solutions for Class 12 Biology Chapter 8. For more in-depth understanding, go with the Solutions for Class 12 Biology.

Chapter 9 Strategies for Enhancement in Food Production

This chapter deals with the principles of plant and animal breeding. It also makes you familiar with different types of high-yielding varieties of plants. You will also learn about important topics like plant breeding, tissue culture, and the different techniques involved in these. In the end, you will be required to answer the NCERT exercise which has 15 questions. For a basic understanding of the chapters, you should attempt these questions and write the correct solutions of Class 12 Biology chapter 9.

Chapter 10 Microbes in Human Welfare

Here are the topics that you will learn about, which include details about the role of microorganisms for the benefit of humankind and the uses of microorganisms in different areas for different purposes. For board exams and for exams like NEET, only NCERT of this chapter is enough. While preparing the chapter, read each and every line of the lesson and also solve the NCERT exercise given at the end to score well in your exams.

Chapter 11 Biotechnology: Principles and Processes

Chapter 11, Biotechnology: Principles and Processes, deals with the recent area of research, i.e., recombinant DNA technology. In this chapter, only an introduction to this technology is given, so you will study more about it in the future in higher classes. You will gain an awareness of the principles of biotechnology and its tools once you finish this lesson. The exercise given at the end of the chapter includes a total of 12 questions. After reading the chapter, try answering all the questions. In case you are stuck, refer to the Biology NCERT solutions for class 12.

Chapter 12 Biotechnology and Its Applications

Here, you will learn about biotechnology and its applications, as well as the various uses of biotechnology in the food industry, medicine industry, etc. This chapter will introduce you to transgenic animals as well as the ethical issues raised. After reading the chapter thoroughly, go through the NCERT exercises and solve them on your own. If you need help answering the questions, CBSE NCERT solutions for class 12 biology are the correct tools to use.

Chapter 13 Organisms and Populations

Characteristics of populations, including population growth and population interactions, are some of the topics dealt with in this chapter. Other topics taught are ecological factors and how organisms get affected by them. The NCERT exercise given at the end of the chapter has 17 questions. Refer to the CBSE Class 12 Biology NCERT solutions given to answer them correctly.

Chapter 14 Ecosystem

In the chapter Ecosystem, you will study the structures, functions, and various components of the ecosystem. You will also get to learn about ecosystem services, ecological succession, and biogeochemical cycles. This chapter will also tell you about the energy flow of the ecosystem with examples. Try the NCERT exercise to get clarity on all the concepts in your mind.

Chapter 15 Biodiversity and Conservation

Chapter 15 compiles the details of the diversity of life. In biodiversity and conservation NCERT solutions , you will learn the importance of biodiversity as there are three types of diversity: genetics, species, and ecological. This chapter also includes the measures that are to be taken to conserve biodiversity. You must try the NCERT exercise on Chapter 15: Biodiversity and its Conservation. From the exam perspective, the biology solutions in NCERT Class 12 Chapter 15: Biodiversity and its Conservation are beneficial.

Chapter 16 Environmental Issues

This chapter will make you aware of all the different types of pollution and environmental issues that exist around us. The various environmental issues, such as pollution, global warming, ozone layer depletion, etc., have been mentioned here. In-depth, accurate answers can be checked with the help of the solutions given here.

Class 12 NCERT Biology: CBSE Marking Scheme 2024-25

The marks scored in Class 12 help students plan their future. With this in mind, the CBSE board evenly divided the entire syllabus to make it easier for students to understand all the concepts. Students will be able to identify the chapters that carry more weight and focus on them appropriately by reading through the course structure that the CBSE board has updated.








Genetics and Evolution



Biology and Human Welfare



Biotechnology and its Applications



Ecology and Environment: Chapters




Highlights of Biology NCERT Solutions for Class 12

Key features of Biology Class 12 NCERT Solutions are given below:

  • Solutions for Class 12 Biology Chapters are written in the best possible way, using simple language that makes solutions easier to read and understand. The solution content is derived from the textbook by the subject expert.
  • In the Solution for NCERT 12 biology, points are used to frame answers to help students understand them quickly.
  • Solutions for 12th biology are as per the latest CBSE Syllabus and guidelines.
  • You will gain an edge in your preparation for NEET and other medical entrance exams.
  • Important topics are listed in the solutions for Class 12 Biology NCERT chapters.
  • Class 12 Biology All Chapter names with solutions are given in the table, which is easier to access and download in PDF.
  • Solutions given for 12th bio NCERT are Jargon-free
  • Concepts will be clearer with the help of the NCERT Biology Class 12 Solutions.

More About Class 12 Biology NCERT Solutions

  • Overall, class 12 biology is an amalgamation of botany, zoology, and the applications of biology, which can be researched and studied extensively if you wish to study biology or related streams in the future. Biology exercise solutions will help you clear all doubts

  • From an exam point of view, studying the Class 12 Biology solutions will help you excel in your board exams. If you are planning to appear for NEET or any other medical entrance exams, then solutions for NCERT Class 12 Biology will be another good tool for your preparation.

  • The NCERT Textbook of Class 12 Biology includes a total of 16 chapters segregated into 5 units: reproduction, genetics, evolution, biology in human welfare, biotechnology, and ecology. After studying the NCERT Solutions for Class 12 Biology PDF Download, you will be able to solve different practice questions asked in the textbook. It is prudent to start solving the NCERT exercise for class 12 biology after a thorough reading of the chapters of the class 12 Biology Textbook.

  • Solving NCERT exercises is an important prerequisite if you wish to score well in your board exams. So biology notes for each chapter with the Class 12 Bio Exercise Solutions will be a very good weapon to combat the exam blues and crack the board exams.

  • Once you are done with the NCERT solutions for class 12 biology, you will find that your understanding of concepts will also be useful in the NEET and other exams.

NCERT Solutions for Class 12 Biology all chapters play an essential role in your board exam preparations as well as for competitive exams such as NEET. Aside from that, qualified academics and faculty members worked hard to prepare the Biology NCERT Solutions for Class 12 materials. The NCERT Class 12 Biology solutions give an in-depth knowledge of the questions asked in the NCERT Books for Class 12 Biology. Through NCERT Solutions Class 12 Biology, you will also learn how to deal with questions with the right approach.

Therefore, we have organised Class 12 Biology NCERT Solutions PDF, keeping the Class 12 NCERT Syllabus in mind, so that students can easily comprehend and remember the crucial concepts of Bio NCERT Class 12. Stay updated with the NCERT Syllabus for Class 12 that has been updated for 2023–24.

NCERT Solutions for Class 12 Subject wise

NCERT Class wise Solutions

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

Frequently Asked Question (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 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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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 3.8×107 J 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)


Option 2)

\; K\;

Option 3)


Option 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)


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)


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

Option 1)

less than 3

Option 2)

more than 3 but less than 6

Option 3)

more than 6 but less than 9

Option 4)

more than 9

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