Science [1 Marks Each] QUE - ANS

Why do earthworms come out of the soil during heavy rains?

How does an earthworm breathe?

Define atmosphere.

The layer of air around the earth is known as ___________.

Why should you not sleep under the trees during the night?

What happens when air comes in contact with a cool surface?

Will the tiny air bubbles seen before the water actually boils, also appear if we do this activity by reheating boiled water kept in an airtight bottle?

How does an organism living in soil breathe?

What do you mean by relative humidity?

Name the vital component of air. Specify its importance.

Which gas in the atmosphere is essential for respiration?

Why do we feel suffocated in a closed room if something is becoming there?

What is the role of long chimneys in factories?

Explain the following observations very briefly.
An empty glass in fact is not empty.

Why you feel suffocation in a closed room, where some material is burning?

State whether the following statements are true or false. If false, correct them.
Air helps in the movements of sailing yachts and glider but plays no role in the flight of birds and aeroplanes.

What is the percentage of oxygen in the air?

Why do policemen regulating traffic at a crowded crossing often wear a mask?

Which of the two can uproot trees and blow off the roof tops, air or storm?

State whether the following statements are true or false. If false, correct them.
Air does not occupy any space.

Fill in the blanks with the appropriate Words:
The oxygen helps in breaking down the digested food in the body to release the _______.

Which gas is most abundant and is important for growth of plants and animals?

Are respiration and breathing same?

What is humidity?

What will happen if the amount of oxygen is increased in the air?

Name any two musical instruments in which air plays an important role.

What is the percentage of nitrogen in the air?

Name the gas which forms the major part of air.

How do the organisms living in soil get the air they need, for respiration?

Wind does not help in the movement of which of the following?

What are the properties of air?

When does winnowing is more effective?

Name the food manufacturing process of plants.

Name the component of air used by plants to make their food.

Make sentences using the given set of words.
Air, wind, motion, called.

Make sentences using the given set of words.
Respiration, dissolved, animals, air, aquatic.

In a number of musical instruments, air plays an important role. Can you name some such instruments?

Ram is breathing with his mouth, is it write, if no why?

State two properties of air.

State whether the following statements are true or false. If false, correct them.
Plants produce oxygen during the process of making their own food.

Why an animal living in soil does, comes out of soil for respiration in rainy season?

The component of air used by green plants to make their food, is ___________.

Why is air dissolved in water richer in oxygen than ordinary air?

Two jars A and B are filled with two gases-nitrogen and oxygen. Both are colourless and odourless. How can you identify the jar that contains oxygen gas?

State whether the following statements are true or false. If false, correct them.
Plants consume oxygen for respiration.

Why are factories fitted with tall chimneys?

Name the component of air used by green plants to make their food.

Name the gases present in air. Which one of them is most abundant?

Activity.In the presence of your teacher, fix two small candles of the same size in the middle of two shallow containers. Now, fill the containers with some water. Light the candles and then cover each one of them with an inverted glass (one much taller than the other) as shown in the figure. Observe carefully what happens to the burning candles and the water level.
Do the candles continue to burn or go off? Does the level of water inside glasses remain the same?

Define oxygen cycle.

Why do you think mountaineer carry oxygen cylinders with them, while climbing high mountains?

Why does the transparent glass of windows, if not wiped off regularly, appears hazy?

Why there are long chimneys in factories?

What is atmosphere?

What is air made up of?

Why we should not breathe through our mouth?

The mountaineers carry oxygen cylinder with them while climbing high mountains.Why?

When the open mouth of an empty bottle is tilted in a bucket filled with water, we see bubbles coming out of it. Explain the phenomenon.

Explain with flow diagram oxygen-carbon dioxide balance in the atmosphere.

Name the gases present in atmosphere.

Name the substances which are present in traces in air. What are these together called?

Which of the two gases are present in higher amount in the atmosphere oxygen or carbon dioxide gas?

Have you ever seen tiny shining particles in the beam of sunlight, what are these particles?

Why pages of an open book begin fluttering when the fan is switched on?

Air occupies space. Explain the statement.

Activity.Find a sunny room in your school/home. Close all the doors and windows with curtains pulled down to make the room dark. Now, open the door or a window facing the sun, just a little, in such a way that it allows sunlight to enter the room only through a slit. Look carefully at the incoming beam of sunlight.
Do you see some tiny shining particles moving in the beam of sunlight (Fig.)? What are these particles?

How does oxygen become available to the animals in water and soil?

How can you show that air is dissolved in water?

How does oxygen occur in nature?