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NCERT Solutions for Class 12 Biology Chapter 7 Evolution

NCERT Solutions for Class 12 Biology Chapter 7 Evolution

Edited By Irshad Anwar | Updated on Sep 14, 2023 09:59 PM IST | #CBSE Class 12th

NCERT Solutions for Class 12 Biology Chapter 7 Evolution: Your search for questions and answers for Evolution NCERT Class 12 ends here, as we provide detailed solutions to each chapter of the NCERT Solutions for Class 12 Biology. These solutions are in accordance with the most recent CBSE Syllabus (2023–24). What exactly is evolution? Go through the Evolution Class 12 Solutions,To understand the changes in flora and fauna that have occurred over millions of years on earth, we must have an understanding of the context of the origin of life, i.e., the evolution of the earth, of stars, and indeed of the universe itself. Solutions for NCERT Class 12 Biology Chapter 7 Evolution will help you understand the story of the origin of life and the evolution of life forms or biodiversity on planet earth in the context of the evolution of earth and against the background of the evolution of the universe itself. keeping reading to learn more about NCERT Solutions for Class 12 Biology Chapter 7 Evolution.

In CBSE NCERT Solutions for Class 12 Biology, Chapter 7, Evolution, you will find an easy way to remember the facts. The diversity of life forms on earth has been changing over millions of years. In the solutions of Evolution NCERT, you will find questions and answers based on such facts. The origin of life on earth can only be understood against the background of the origin of the universe, especially the earth. Considering the size of the universe, the earth is indeed a speck. Class 12 Biology Chapter 7 NCERT Solutions will also tell you that the universe expanded, and hence, the temperature came down.

Chapter 7 Biology Class 12 NCERT Solutions, provide questions and explanation about the Big Bang Theory. In evolution, you will learn about the Big Bang theory, which explains the origin of the universe. Evolution Class 12 NCERT Solutions talks of a singular, huge explosion unimaginable in physical terms. After going through Biology Chapter 7 Class 12, which is evolution, you will be able to answer all the questions given at the end of the chapter. And if you're still confused, then the Evolution NCERT PDF is there for you all the time. Also, try to attempt all the questions given in NCERT, and in case you have any doubt, refer to the Evolution Class 12 NCERT PDF. Here you will get all the answers to those questions that are mentioned in this Evolution chapter, which will help you score well in the 12th board exam as well as other competitive exams. If you are looking for the answers to any other class from 6–12, then NCERT Solutions are there for you.

NCERT Solutions For Class 12 Biology Evolution

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NCERT Solutions for Class 12 Biology Chapter 7: Evolution (Solved Textbook Exercise)

Evolution Class 12 Questions and Answers:

Q 1. Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory.


Darwinian selection theory suggests that the environment selects organisms with useful variation over those which do not have useful variations. It is mainly because, in a dynamic environment, these organisms are better adapted to survive. A well-defined example for Darwin's theory is antibiotic resistance in bacteria. When bacteria were grown on penicillin containing agar medium, all the bacteria died, however, the ones having variations conferring penicillin resistance survived. Later, these bacteria multiplied and increased their number. As a result of this, penicillin-resistant bacteria evolved and survived because of the environment that selected these over the others.

Q2. Find out from newspapers and popular science articles any new fossil discoveries or controversies about evolution.


A recent study suggests Ledumahadi mafube is the fossil from South Africa, that marked the beginning of gigantic dinosaurs. This 200 million-year-old dinosaur weighed around 12 tons, making it the earliest dinosaur to pass beyond the 10-ton threshold. Later, dinosaurs would become even bigger. But in its time, Ledumahadi mafube was a giant among dwarfs (Source- Business standard).

Class 12 Evolution NCERT Solutions:

Q3. Attempt giving a clear definition of the term species. .


The term species refers to a group of individuals that are similar in their characters and can interbreed among themselves and produce viable and fertile progenies.

Q4. Try to trace the various components of human evolution (hint: brain size and function, skeletal structure, dietary preference, etc.)


The various components of human evolution involve the age of appearance, brain capacity, posture, locomotion, height, body hairs, dietary preferences, skeletal structure, cranium structure etc. A summary of human evolution based on these components is as follows:

Name of the Organisms
Brain capacity in cm ^{^{3}}
Dietary preferences
Some other features
not known
Bent, ape-like
Soft fruits and leaves
Equal sized arms and legs, large canines
not known
Semi-erect, more man-like
seeds and nuts
Large molars, small canines
Fully erect
Small canines, hunted with stones
Homo habilis
Fully erect
Toolmakers with small canines
Homo erectus
Fully erect
Used tools made of stones and bones
Homo neanderthalnsis
Fully erect
Cave dwellers used to hide their bodies
Homo sapiens
Fully erect
Highly intelligent, social

Class 12 Biology Chapter 7 NCERT Solutions:

Q5. Find out through internet and popular science articles whether animals other than man has self-consciousness.


Self-consciousness is the awareness of an animal towards its surroundings. Other than man, the animals which show self-consciousness are dolphins, orangutans, gorilla, chimps, elephants etc. Even dogs also show subtle consciousness.

Q6. List 10 modern-day animals and using the internet resources link it to a corresponding ancient fossil. Name both.


Some modern animals and fossils to which they can be linked are as follows:

Name of the animal
Name of the fossils

Class 12 Biology Chapter 7 Question Answer:

Q7. Practise drawing various animals and plants.


With the help of your teachers try drawing various plants and animals. While drawing, you can draw comparisons between different structures of animals and plants.

Note- The answer to this question varies according to the students.

Q8. Describe one example of adaptive radiation.


Adaptive radiation refers to the process in which the individuals belonging to a rapidly diversifying group, diverge from their lineage to form new species. Adaptive radiation works on the theory of natural selection. One example of adaptive radiation is Darwin's finches of Galapagos island. These finches were formed from a single diversifying species that came on this geographical region accidentally. The new species diversified and got adapted to the conditions present on this habitat. The different finches developed different eating habits and accordingly developed different beak structures. This further led to their evolution through adaptive radiation.

Class 12 Biology Ch 7 Question Answer:

Q9. Can we call human evolution as adaptive radiation?


No, human evolution cannot be called adaptive radiation because, in adaptive radiation, a single species diversifies into new different species, however, in case of human evolution, the gradual evolution of a single species occurred with time.

Q10. Using various resources such as your school library or the internet and discussions with your teacher, trace the evolutionary stages of any one animal, say horse.


The evolutionary stages of a horse are as follows:

Name of the evolutionary stage
Features of the animal
It has 4 toes, all of them are functional. Head and neck are short
A slight increase in height with 3 toes on each foot
It was 100 cm tall with 3 toes on each foot. Molars were present
It had a single functional toe with a splint in 2 and 4 of each limb. They are 108 cm tall.
They have one tow in each foot. For grinding they have molars, and for cutting they have incisors

NCERT Solutions for Class 12 Biology Chapter 7 – Evolution

Evolution is covered in the Unit - Genetics and Evolution of the NCERT Solutions for Class 12 Biology. According to historical patterns, the genetics and evolution unit receives around 18 marks. In other words, approximately 25% of the exam's questions come from this unit. For students, seeing the chapter's overall weight serves as an eye-opener about its significance. Therefore, in order to be prepared for any type of question that might appear in the exam, all topics must be thoroughly understood and regularly reviewed from the Class 12 Biology Chapter 7 NCERT Solutions.

Evolutionary biology deals with the study of the evolution of life on Earth. Evidence for evolution can be found in the study of fossils, comparative anatomy, and associated biochemistry. The concept of life's origin is outlined in the Biology Chapter 7 Class 12. It provides an overview of the theoretical aspects of life's evolution. The various concepts covered are presented to the students, along with adaptive radiation and biological evolution in Chapter 7 Biology Class 12 NCERT Solutions.

Important topics of NCERT Solutions for Class 12 Biology Chapter 7 Evolution:

Topics and Subtopics in NCERT Solutions for Class 12 Biology Chapter 7 Evolution:

Topic Name
7.1Origin of Life
7.2Evolution of Life Forms – A Theory
7.3What are the Evidences for Evolution?
7.4What is Adaptive Radiation?
7.5Biological Evolution
7.6Mechanism of Evolution
7.7Hardy – Weinberg Principle
7.8A Brief Account of Evolution
7.9Origin and Evolution of Man

Highlights of NCERT Solutions for Class 12 Biology Chapter 7 Evolution

Class 12 Biology Chapter 7 NCERT Solutions key features are listed below:

  • The questions and answers for evolution NCERT are written in the best possible way using simple language that makes solutions in the Evolution Class 12 NCERT PDF easier to read and understand
  • In chapter 7 biology Class 12 NCERT solutions,points are used to frame answers to help understand quickly.
  • The solution content for Evolution Class 12 questions and answers is derived from the textbook by the subject expert.
  • Evolution Class 12 Solutions are as per the latest CBSE Syllabus and guidelines.
  • Genetics and evolution NCERT PDF download links are readily available and easily accessible for free.
  • Important topics are listed in the evolution Class 12 NCERT solutions.

Also Check NCERT Books and NCERT Syllabus here:

NCERT Solutions for Class 12 Biology: Chapter-wise

NCERT Solutions for Class 12 - Subject wise:

NCERT Exemplar Class 12 Solutions

We hope Class 12 students will ace your Board examinations with the help of NCERT Solutions for Class 12 Biology Chapter 7 Evolution.

Frequently Asked Question (FAQs)

1. What are the important topics of evolution ncert?

The important topics of evolution ncert class 12 are:

  • Origin of Life   
  • Evolution of Life Forms – A Theory   
  • What are the Evidences for Evolution?   
  • What is Adaptive Radiation?   
  • Biological Evolution   
  • Mechanism of Evolution   
  • Hardy-Weinberg Principle   
  • A Brief Account of Evolution   
  • Origin and Evolution of Man 
2. What are examples of coevolution given in Chapter 7 of NCERT Solutions for Class 12 Biology?

These are examples of coevolution given evolution ncert class 12:

  • Predator-Prey Coevolution
  • Flowering Plants and Pollinators
  • Herbivores and plants
  • Acacia ants and Acacias
3. What are two examples of convergent evolution given in Chapter 7 of NCERT Solutions for Class 12 Biology?

Chapter 7 of NCERT Solutions for Class 12 Biology explains the following two examples of convergent evolution:

  • echolocation in whales and bats
  • the silk-producing ability of spiders and silk moths
4. What are the three types of evolution given in evolution ncert?

The three types of evolution:

  • divergent evolution
  • convergent evolution
  • parallel evolution
5. How to download NCERT Solutions for Class 12 Biology Chapter 7 PDF?

To download class 12 Biology evolution ncert pdf, students can use the online webpage to pdf converter tools. To Score Well in the examination, follow  NCERT Solutions, NCERT syllabus and exercise given in the NCERT Book. To practice more problems, students can refer to NCERT exemplar.


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Questions related to CBSE Class 12th

Have a question related to CBSE Class 12th ?

Here are some options you can explore to get admission in a good school even though admissions might be closed for many:

  • Waitlist: Many schools maintain waitlists after their initial application rounds close.  If a student who secured a seat decides not to join, the school might reach out to students on the waitlist.  So, even if the application deadline has passed,  it might be worth inquiring with schools you're interested in if they have a waitlist and if they would consider adding you to it.

  • Schools with ongoing admissions: Some schools, due to transfers or other reasons, might still have seats available even after the main admission rush.  Reach out to the schools directly to see if they have any open seats in 10th grade.

  • Consider other good schools: There might be other schools in your area that have a good reputation but weren't on your initial list. Research these schools and see if they have any seats available.

  • Focus on excelling in your current school: If you can't find a new school this year, focus on doing well in your current school. Maintain good grades and get involved in extracurricular activities. This will strengthen your application for next year if you decide to try transferring again.

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In India, the design and coding fields offer exciting career options that can leverage your interest in both. Here's how you can navigate this path:

Choosing Your Stream:

  • Graphic Design Focus: Consider a Bachelor's degree in Graphic Design or a design diploma. Build a strong portfolio showcasing your creative skills. Learn the basics of HTML, CSS, and JavaScript to understand web development better. Many online resources and bootcamps offer these introductory courses.

  • Coding Focus: Pursue a Computer Science degree or a coding bootcamp in India. These programs are intensive but can equip you with strong coding skills quickly. While building your coding prowess, take online courses in graphic design principles and UI/UX design.

Engineering Subjects (for a Degree):

  • Information Technology (IT): This offers a good mix of web development, networking, and database management, all valuable for web design/development roles.

  • Human-Computer Interaction (HCI): This is a specialized field that bridges the gap between design and computer science, focusing on how users interact with technology. It's a perfect choice if you're interested in both aspects.

  • Passing NIOS in October 2024 will make you eligible for NIT admissions in 2025 . NIT admissions are based on your performance in entrance exams like JEE Main, which typically happen in January and April. These exams consider the previous year's Class 12th board results (or equivalent exams like NIOS).

Here's why 2025 is more likely:

  • JEE Main 2024 Admissions: The application process for NITs through JEE Main 2024 is likely complete by now (May 2024). They consider your 2023 Class 12th marks (CBSE in this case).
  • NIOS Results: Since NIOS results typically come out after the NIT admission process, your October 2024 NIOS marks wouldn't be available for JEE Main 2024.

Looking Ahead (2025 Admissions):

  • Focus on JEE Main: Since you have a computer science background, focus on preparing for JEE Main 2025. This exam tests your knowledge in Physics, Chemistry, and Mathematics, crucial for engineering programs at NITs.
  • NIOS Preparation: Utilize the time between now and October 2024 to prepare for your NIOS exams.
  • Eligibility Criteria: Remember, NITs typically require a minimum of 75% marks in Class 12th (or equivalent) for general category students (65% for SC/ST). Ensure you meet this criteria in your NIOS exams.

Yes, scoring above 99.9 percentile in CAT significantly increases your chances of getting a call from IIM Bangalore,  with your academic background. Here's why:

  • High CAT Score: A score exceeding  99.9 percentile is exceptional and puts you amongst the top candidates vying for admission. IIM Bangalore prioritizes  CAT scores heavily in the shortlisting process.

  • Strong Academics: Your 96% in CBSE 12th and a B.Tech degree demonstrate a solid academic foundation, which IIM Bangalore also considers during shortlisting.

However, the shortlisting process is multifaceted:

  • Other Factors: IIM Bangalore considers other factors beyond CAT scores, such as your work experience (if any), XAT score (if you appear for it), academic diversity, gender diversity, and performance in the interview and Written Ability Test (WAT) stages (if shortlisted).

Here's what you can do to strengthen your application:

  • Focus on WAT and PI: If you receive a shortlist, prepare extensively for the Written Ability Test (WAT) and Personal Interview (PI). These stages assess your communication, soft skills, leadership potential, and suitability for the program.

  • Work Experience (if applicable): If you have work experience, highlight your achievements and how they align with your chosen IIM Bangalore program.

Overall, with a stellar CAT score and a strong academic background, you have a very good chance of getting a call from IIM Bangalore. But remember to prepare comprehensively for the other stages of the selection process.


Yes you can appear for the compartment paper again since CBSE gives three chances to a candidate to clear his/her exams so you still have two more attempts. However, you can appear for your improvement paper for all subjects but you cannot appear for the ones in which you have failed.

I hope this was helpful!

Good Luck

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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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