Notes-NCERT-Class-7-Science-Curiosity-Chapter-1-The Ever-Evolving World of Science-CBSE

How does science help us improve our thinking? :

• Science helps us think in a better and logical way.
• It starts with curiosity and involves observing, asking questions, and finding answers through reasoning.
• Science is all around us — in cooking, gardening, machines, and even in how our body grows.
  Learning science means doing experiments, sharing ideas, and connecting what we learn to real life.
• Asking the right questions is very important because it helps us understand things more deeply.

The Interconnected Nature of Science :

Branches of Science :
Science is divided into different parts like Physics, Chemistry, Biology, and Earth Science. But all these branches are connected to each other.

For example:

• When we study water, we learn about its states like solid, liquid, and gas (Physics), its chemical nature (Chemistry), how it supports living things (Biology), and how it moves in nature (Earth Science).
• When we observe the sky, we study how the Earth moves (Physics and Astronomy), how this movement changes the weather (Earth Science), and how it affects plants and animals (Biology).

Understanding one area often leads to questions in another. This interconnectedness makes science an interesting field of study.

Importance of Science :

Science is very important because it helps us understand the world around us. It makes us curious, helps us ask questions, and find answers. Here's how science helps in our daily life:

(1) Properties of Materials :

Science helps us know why:

• A lemon tastes sour
• A turmeric stain turns red when washed with soap
  It teaches us about the things we use every day like fruits, clothes, and soaps.

(2) Electricity and Conductivity :

When we connect batteries, wires, and bulbs:

• Science helps us learn how electricity flows
• It tells us which materials allow electricity to pass (like metal) and which do not (like plastic)

(3) Changes Around Us :

Science explains:

• Reversible changes: like melting ice (can be changed back)
• Irreversible changes: like burning paper or ripening fruit (cannot be changed back)

(4) Heat and Water Cycle :

Science helps us understand:

• How heat melts glaciers
• How water moves in nature (evaporation, condensation, rain)
• How heat affects weather and seasons

(5) Growth and Life Processes :

Science explains:

• How our body grows, breathes, and digests food
• How plants grow using sunlight, water, and air
  It helps us understand how living things survive.

(6) Measurement and Time :

• Long ago, people used the position of the shadows to tell time.
• Now we use clocks and watches
  Science has improved how we measure time accurately.

(7) Light and Shadows :

Light helps us see छ

• When something blocks light, it creates a shadow
• Big shadows in space cause eclipses
• We have day and night because the Earth spins

(8) Movements of Earth and Moon :

Science explains:

• The Moon moves around the Earth
• The Earth moves around the Sun
  These movements cause:
• Phases of the Moon
• Seasons
• Sunrise and Sunset