NCERT Solutions for Class 7 Science Chapter 1 The Ever-Evolving World of Science

Edited By Shivani Poonia | Updated on Jul 19, 2025 09:26 AM IST

Do you know that science is all around you? Whether it is the food we eat, the air we breathe, or the gadgets we use every day, science plays a crucial role in our daily lives. The chapter Ever-Evolving World of Science aims to develop curiosity among the students about the world around them and to help them analyze the everyday observations. This chapter focuses on the importance of asking questions, making observations and using logical thinking through engaging examples. Let us explore the world of science through this chapter!

This Story also Contains

Download PDF of NCERT Solutions for Class 7 Science Chapter 1
NCERT Solutions for Class 7 Science Chapter 1 (Most Probable Questions)
NCERT Solutions for Class 7 Science Chapter 1 (Activity 1.1)
Practice Questions for Class 7 Science Chapter 1
Approach to Solve Questions of Class 7 Science Chapter 1
Topics Covered In NCERT Solutions for Chapter 1
NCERT Solutions for Class 7 Science Chapter-Wise
NCERT Books and NCERT Syllabus

NCERT Solutions for Class 7 Science Chapter 1 The Ever-Evolving World of Science

Science is not just about facts but also about questioning and exploring the world. The concepts like the basics of science, human life and importance of observation are well portrayed in this chapter. The NCERT solutions for class 7 science chapter 1 will offer a systematic approach for understanding these concepts through a series of solved questions. These NCERT solutions are aligned with the latest CBSE curriculum and will serve as a valuable resource for students to enhance their exam performance. The practice questions for class 7 science chapter 1 are also included in the article to improve your critical thinking. We have also mentioned a few points to help you build a good approach for solving the questions.

Download PDF of NCERT Solutions for Class 7 Science Chapter 1

Students can download the science class 7 chapter 1 solutions PDF from the link below and can revise the concepts anytime.

Download PDF

NCERT Solutions for Class 7 Science Chapter 1 (Most Probable Questions)

The Class 7 science chapter 1 important questions and answers are given below to help you practice for exams. You can also access the Class 7 NCERT solutions for other subjects as well.

Question 1. Fill in the blanks

(i) Science is not just about facts. It is also about ………. and ………….

(ii) Changes like fruits …………… are ………….. and cannot be reversed.

(iii) Animals need to eat, breathe, and circulate …………. to survive.

(iv) Plants prepare their food through ………….

(v) Studying………….. and ………… helped people understand day and night.

Answer:

(i) Science is not just about facts. It is also about questioning and exploring.

(ii) Changes like fruits ripening are permanent and cannot be reversed.

(iii) Animals need to eat, breathe, and circulate nutrients to survive.

(iv) Plants prepare their food through photosynthesis.

(v) Studying light and shadows helped people understand day and night.

Question 2. What is the purpose of asking questions and exploring in science?

(i) To find out facts

(ii) To learn from books

(iii) To confirm known things

(iv) To discover new things and think logically

Answer:

The correct answer is option (iv).

In science, asking questions helps us inquire and understand how things work. It encourages us to think clearly and find new ideas or explanations.

Question 3. What is the main goal of science?

Answer:

The main goal of science is to understand the natural world through experiments, observation, and by asking questions. It explains how things work and solves problems. Science also helps improve technology, health, and the quality of life for people.

Question 4. How are light and shadows important in understanding the universe?

Answer:

Light and shadows help us understand the presence, shape, and movement of objects. They allow scientists to study distant stars and planets. They also help us understand phenomena like day and night as well as the movement of celestial bodies such as the Earth, the moon, and the sun.

Question 5. What happens when materials like batteries run out?

Answer: When batteries run out, they cannot produce electrical energy because the chemical reactions stop inside them. The battery then becomes "dead" and needs to be recharged (if it's rechargeable) or replaced.

NCERT Solutions for Class 7 Science Chapter 1 (Activity 1.1)

The solutions to the activity covered in the Class 7 science curiosity chapter 1 are given below.

Question 1. Make suitable questions according to the given answers:

(i) Question:.................................................................

Answer: Because the cat’s teeth were crooked.

(ii) Question: ………………………………………………..

Answer: Just add some milk.

(iii) Question:....................................................................

Answer: Don’t panic, I have my towel.

(iii) Question:....................................................................

Answer: 42.

Answer:

Question (i). Why do cats have difficulty in eating?

Question (ii). What can I add to the banana shake?

Question (iii). Do you have your towel?

Question (iv). A gardener plants 6 rows of flowers, with 7 flowers in each row. How many flowers did the gardener plant in total?

Practice Questions for Class 7 Science Chapter 1

The practice questions for Class 7 science chapter 1 are provided for your assistance. The Class 7 science curiosity chapter 1 is important to understand the basics of science.

Question 1. What is the difference between invention and discovery?
Answer:
A discovery is finding something that already exists (like gravity).
An invention is creating something new (like the telephone).

Question 2. How does science help in our daily lives?
Answer:
Science helps us cook food, travel, use mobile phones, cure diseases, and make life easier with technology.

Question 3. Name two scientists and their contributions.
Answer:

The names of the two scientists are Isaac Newton and Alexander Fleming.
Isaac Newton – Discovered gravity and explained the laws of motion.
Alexander Fleming – Discovered penicillin (a medicine that kills bacteria). This led to the development of antibiotics.

Question 4. Why is science called ever-evolving?
Answer:
Science is called ever-evolving because it keeps changing as we learn new things and make new inventions or discoveries.

Question 5. How does observation help in science?

Answer:

Observation helps us notice details about the world around us. It is the first step in finding answers, asking questions, and making discoveries in science.

Approach to Solve Questions of Class 7 Science Chapter 1

The following points will help you build a good approach to solve the question of this class 7 science chapter 1 effectively.

1. Understand the key concepts
Try to focus on what science is, how it evolves with time and the role of observation, experimentation and evidence in scientific progress. This will help you a lot in answering the questions on your own.

2. Learn important terms
Memorize terms like invention, discovery, observation and innovation. Also try to understand their meanings through examples. Read the class 7 science NCERT book thoroughly.

3. Try to connect with real life
Try linking scientific developments with real-world inventions (like light bulbs, vaccines or mobile phones) to better understand how science impacts life.

4. Use diagrams and timelines
For long answers, you can also draw timelines or simple diagrams for quick revisions. The Class 7 science chapter 1 important questions and answers should not be missed.

5. Practice questions
Read the textbook thoroughly and attempt all in-text and end-of-chapter questions. You can practice application-based and reasoning questions and revise them regularly.

Do download the science class 7 chapter 1 solutions PDF for feasible learning.

Topics Covered In NCERT Solutions for Chapter 1

We have listed the Class 7 science chapter 1 important topics below. Read the class 7 science NCERT book thoroughly. The NCERT solutions for class 7 science chapter 1 are designed to help you understand these topics.

Understanding the basics of science
How to think logically?
Making observations
Questioning and Exploring the world
How is human life transformed?
What is happening and why?
How is the world evolving?

NCERT Solutions for Class 7 Science Chapter-Wise

The chapter-wise hyperlinks of the NCERT science class 7 solutions are given below.

NCERT Solutions for Class 7 Science Chapter 1 The Ever-Evolving World of Science

NCERT Solutions for Class 7 Science Chapter 2 Exploring Substances: Acidic, Basic, and Neutral

NCERT Solutions for Class 7 Science Chapter 3 Electricity: Circuits and their Components

NCERT Solutions for Class 7 Science Chapter 4 The World of Metals and Non-metals

NCERT Solutions for Class 7 Science Chapter 5 Changes Around Us: Physical and Chemical

NCERT Solutions for Class 7 Science Chapter 6 Adolescence: A Stage of Growth and Change

NCERT Solutions for Class 7 Science Chapter 7 Heat Transfer in Nature

NCERT Solutions for Class 7 Science Chapter 8 Measurement of Time and Motion

NCERT Solutions for Class 7 Science Chapter 9 Life Processes in Animals

NCERT Solutions for Class 7 Science Chapter 10 Life Processes in Plants

NCERT Solutions for Class 7 Science Chapter 11 Light: Shadows and Reflections

NCERT Solutions for Class 7 Science Chapter 12 Earth, Moon, and the Sun

NCERT Books and NCERT Syllabus

The links for the NCERT books and NCERT syllabus for class 7 are given in the table below. Use them to get a clear idea of the syllabus.

NCERT Books for Class 7 Science

NCERT Syllabus for Class 7 Science

NCERT Books for Class 7

NCERT Syllabus for Class 7

Also Read

NCERT Solutions for Class 7 Maths

Frequently Asked Questions (FAQs)

1. Why is experimentation so important in science accrording to Class 7 science chapter 1?

Experiments are important because they help us find out if an idea or guess (called a hypothesis) is right or wrong. A good experiment lets us change one varaible at a time to see how it affects the result.

2. According to the class 7 science chapter 1, what makes a great scientist?

A great scientist is someone who is curious, observant and always ready to ask questions. They think logically, do careful experiments and are open to changing their ideas when new evidence is found.

3. Why observation is important?

Observation is the first step in learning about the world around us. By carefully watching and noticing details, we can discover how things work and ask the right questions.

4. What was an early method of measuring time?

In older times, people measured time by watching the shadow of the sun using a sundial. They also used water clocks and sand timers to count time.

5. How is curiosity important in learning science?

Curiosity is important in learning science because it encourages us to ask questions and explore how things work. It leads to discovery and makes learning more exciting and meaningful.

Also Read

NCERT Solutions for Class 7 Science Chapter 11 Light: Shadows and Reflections

NCERT Solutions for Class 7 Science Chapter 7 Heat Transfer in Nature

NCERT Solutions for Class 7 Science Chapter 8 Measurement of Time and Motion

NCERT Solutions for Class 7 Science Chapter 3 Electricity: Circuits and their Components

NCERT Solutions for Class 7 Maths Chapter 6 Number Play

NCERT Solutions for Class 7 Maths Chapter 5 Parallel and Intersecting Lines

NCERT Books for Class 7 – Free PDF Download for All Subjects (2025 Edition)

NCERT Books for Class 7 English – Download PDF Free (2025 Edition)

NCERT Books for Class 7 Social Science - Chapter-wise PDF Download

NCERT Books for Class 7 Science 2025-26: Download PDF Here

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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