Test: The Atmosphere - Class 7 MCQ

The atmosphere is like a big blanket around the Earth that protects us from the Sun's harmful rays. Without this blanket, we would get too much sun and feel very hot. So, the atmosphere helps to keep us safe and comfortable on our planet.

The Earth is surrounded by a thin layer of air called the atmosphere. The atmosphere is important for life on Earth because it contains gases we need to breathe and protects us from the Sun's rays.

• Nitrogen is the gas that makes up most of the air we breathe.
• It's super important for plants and helps them grow big and strong.
• Imagine nitrogen as plant food that helps them stay healthy and green!
• So, when you see lots of green plants around, remember that nitrogen in the air plays a big role in keeping them happy and healthy.

Most of the air around us is made up of nitrogen, which is very important for plants and helps them grow big and strong.

Oxygen is important for living things because it helps us breathe and stay alive. When we breathe in oxygen, our bodies use it to break down food and produce energy that our bodies need to function. It's like the fuel that keeps us going every day!

When we eat our food, our bodies need oxygen to help turn it into energy. This energy is what makes us move, play, and do everything we love.

• The Earth stays warm like a greenhouse because of solar radiation from the Sun.
• Just like how a greenhouse traps heat to keep plants warm, the Earth's atmosphere traps heat from the Sun to make sure we have the right amount of warmth for life to flourish.
• So, it's like the Earth is wearing a cozy blanket made of sunlight!

Greenhouse gases like carbon dioxide and methane in the atmosphere trap some of the Sun's energy. These gases act like a blanket around the Earth, helping to keep our planet warm.

• Weather: is about what is happening in the atmosphere right now or during a short time, like today or tomorrow.
• Climate: is about the average weather of a place over a long period, like 30 years or more.
• Main Difference: The main difference is that weather changes quickly, sometimes even within a day, while climate shows us what the weather is usually like in a place over many years.

The area between the equator and the Tropic of Cancer in the north, and the Tropic of Capricorn in the south is called the Torrid Zone. This zone is the hottest of the three zones on Earth.

• The atmosphere is crucial for life on Earth because it provides us with the air we need to breathe.
• It also protects us from the Sun's harmful rays and helps maintain the right temperature for living things to survive.
• Imagine if we didn't have the atmosphere, we wouldn't be able to live comfortably on Earth.
• It's like a big blanket that keeps us safe and cozy.

The Earth is surrounded by a thin layer of air known as the atmosphere. The atmosphere is important for us to breathe, helps protect us from the Sun's rays, and controls the temperature on Earth so we can live comfortably.

Nitrogen is the most important gas in the air we breathe. It helps plants grow and is changed by special bacteria in the soil so that plants can use it to become strong and healthy. So, remember, nitrogen is like plant food in the air!

Most of the air around us is made up of nitrogen. Nitrogen is very important for plants and helps them grow. Plants cannot take nitrogen directly from the air, so special bacteria in the soil change the nitrogen in the air into a form that plants can use.

• Plants need oxygen to make food and survive. Just like how we need to breathe in air to stay alive, plants also take in oxygen but in a different way. This oxygen helps plants in a process called photosynthesis where they make their food. So, oxygen is super important for plants to live and grow big and strong!

Oxygen is very important for turning food into energy in our bodies. When we breathe in, oxygen helps our bodies to make energy from the food we eat.

The Earth's atmosphere works like a greenhouse that traps heat to keep our planet warm. Just like a greenhouse creates a warm environment for plants, our atmosphere traps some of the Sun's heat, helping to maintain a temperature that allows life to thrive on Earth.

Just like how a greenhouse keeps plants warm, the Earth's atmosphere acts like a greenhouse trapping heat to make sure our planet stays cozy and comfortable.

• Weather: describes the condition of the air around us for a short time, like during a day or just a few hours. It includes things like temperature, rain, wind, and other changes we feel each day. So, when we talk about weather, we're talking about what's happening in the sky right now or in a short while.

Atmospheric temperature tells us if the air is hot or cold. It helps us understand how warm or chilly the air is around us. When it's hot, we feel warm, and when it's cold, we feel chilly.

• The area that is the hottest of the three zones on Earth is called the Torrid Zone. It is situated between the equator and the Tropic of Cancer in the north, and the Tropic of Capricorn in the south. This zone gets a lot of heat from the sun, making it very hot. Remember, the Torrid Zone is like the super hot zone on Earth!

The Torrid Zone is located between the Tropic of Cancer and the Tropic of Capricorn. It is the hottest zone on Earth.

• When cold air meets warm, humid air, tiny water droplets form around particles like dust.
• This happens because warm air can hold more moisture than cooler air.
• So, when warm, humid air rises or meets colder air, it cools down, and the water vapor in it turns into tiny water droplets, creating clouds or fog.

When the air gets warmer, it can hold more moisture, so humidity increases.

Relief rainfall happens when warm, moist air rises over mountains. As the air is forced to move upwards, it cools down and forms rain clouds. This type of rainfall occurs when winds carrying moisture encounter higher land, leading to heavy rain on one side of the mountain.