CBSE Class 7 Science Revision Notes Chapter 7

CBSE Class 7 Science Revision Notes Chapter 7 – Weather, Climate, and Adaptation of Animals to Climate

Extramarks provide quality materials to give an edge to exam preparations. Studying the chapters listed in the CBSE Syllabus becomes easy as students feel more confident in the clear explanations for each concept given in the notes.

Class 7 Science Chapter 7 Notes provided by Extramarks provide comprehensive study material to students preparing for the exams. In this chapter, students will learn the concepts of weather and climate, their differences, their effects on migration and adaptation of birds and animals, and finally the Important Questions at the end.

Class 7 Science Chapter 7 Notes notes are prepared by subject matter experts as per the CBSE Syllabus and its latest guidelines. These notes cover all of the key points mentioned in the chapter. Therefore, students can revise them all in a short time before the exam. Chapter 7 Science Class 7 Notes are easily accessible from the Extramarks website. 

Revision Notes For CBSE Class 7 Science Chapter 7

Access Class 7 Science Chapter 7 – Weather, Climate and Adaptations to Climate Notes


  • Migration can be defined as a large-scale movement of birds and animals from one region to another to find a climate suitable for living, breeding, and getting sustenance.
  • The seasonal migration of birds and animals happens from colder regions to warmer regions.
  • During the daylight, birds are guided by the sun; but at night they follow the stars to carry on their journey.
  • A Siberian crane migrates every year from the cold regions of Siberia to India.

Class 7 Chapter 7 Science Notes

Extramarks provides revision notes for the chapter Weather, Climate and Adaptations of Animals to Climate to help students enhance their exam preparation. They can easily access updated study materials from the Extramarks website at their convenience. Subject matter experts prepare these notes in pointers. This makes them concise and easy to understand. These notes explain the chapter in a structured manner, so students can understand the flow between two given concepts.  

Weather and Climate Class 7 Revision Notes

The term “weather” refers to the state of atmospheric elements in a certain place at a certain period of time. The condition of the weather fluctuates depending on a change in the atmospheric elements like temperature, humidity, rainfall, wind pressure, etc. of that given place.

Conditions Affecting Weather

The weather of a region depends on multiple factors. These are:

  • Temperature
  • Humidity in atmosphere
  • Wind or atmospheric pressure in that place
  • Rainfall
  • Cloudiness
  • Visibility of the horizon
  • Separation of air masses


The climate of a place refers to the average weather pattern of that given place over a long period of time. If the average temperature of a place is usually hot then it is called a hot place. If scanty rainfall is also added to the prevailing weather conditions, the climate of that place is considered hot and arid as well.

Some of the determining factors of the climate of a place include the geographical location of that place, its height above sea level, and its overall topography.

Difference Between Weather And Climate – Table Will Be Updated Soon.


One of the key elements that affect the weather of a location is the presence of clouds. Clouds are made up of small droplets of water floating in the atmosphere freely. They are formed through convection. 

The process of cloud formation is as follows:

  • During the day, the air on the earth’s surface becomes hot and light. The warm and light air moves in the upward direction only to be transformed into water droplets after reaching a particular height, where the temperature of the atmosphere drops significantly.
  • These water droplets take a more condensed form and merge to form a cloud.
  • A cloud, therefore, is nothing but a collection of billions of water droplets floating in the air.
  • The water that goes up to the higher sky comes back to the earth in the form of rainfall.

Rain Gauge

A rain gauge is an instrument used for measuring the amount of rainfall at a given place. It has a funnel-like structure at the mouth to collect the rainwater and a cylindrical body to store it. The measuring scale of a rain gauge is drawn on its body.


Tropical Rainforests

  • Tropical rainforests are found in the regions around the equator, where the climate remains extremely hot throughout the year.
  • In winters, the temperature goes down to 15⁰ C, whereas in summers, the temperature rises over 40⁰ C.


The climate of these regions is extremely hot and arid because of continuous exposure to sunlight and minimum rainfall.

Animal Adaptation

  • The ability to adapt to hostile climatic conditions is the key to survival on earth.
  • For example, polar bears have evolved to have long white fur to protect themselves from predators. The thick layer of fat under their skin helps them survive in the icy polar regions.
  • All the species across the globe have developed certain features to survive in their environmental conditions.

FAQs (Frequently Asked Questions)

1. What is meant by humidity?

Humidity is one of the factors that determine weather conditions. The humidity of a place refers to the amount of moisture present in the atmosphere of the given place. Humidity increases with the increasing amount of moisture in the atmosphere. It is measured in the form of a percentage. 100% humidity means the air of that given place cannot be further saturated with moisture.

2. What are the maximum and minimum temperatures of a place?

The maximum and minimum temperatures are measured on a daily basis. The highest temperature recorded in a day is called the maximum temperature, and the lowest recorded temperature is called the minimum temperature of the day. There is a specific thermometer to measure the highest and lowest temperature known as a maximum-and-minimum thermometer.

3. What is weather forecasting?

Weather forecasting is the act of predicting the state of atmospheric elements of a given place. Weather forecasting agencies analyse the rise and fall of temperature, the level of humidity, the clouds in the sky, and other factors to foretell where there will be bright sunshine or where there will be heavy rainfall.

4. What is a weather report?

A weather report is a record of several factors that influence the weather of a given place on a given day. Weather reports help understand the weather pattern of a place and record the temperature, precipitation, humidity, etc. daily.

5. What is the significance of adaptation?

Adaptation is the ability of organisms to adjust to the changing environment. A polar bear, for instance, has evolved to have long fur and developed a layer of fat beneath the skin to survive in the cold climate of the polar region.