Nitrogen is needed by the plants to make

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

The amount of water vapour in the air at any place and time is:

CNG means:

Which gas in the atmosphere is essential for respiration

The layer of air around the earth is known as ___________

Air is a _______of some gases.

The protective envelope of air around the earth is known as _______

Aquatic animals use dissolved ________ in water for respiration

Moving air is known as_______

Soil organisms take air present in______________

_________is used for aeration of drinks like Cocacola

Plant produces food and______ during photosynthesis

Air occupies_______ and has________

Mountaineers carry oxygen ___________ with them, while climbing high mountains.

Plants consume oxygen for respiration.

The composition of air is always exactly the same

Green plants need carbon dioxide gas to make food

Respiration can occur only in the presence of nitrogen

Carbon dioxide is the major component of air

In which process does a plant take in oxygen?

What is meant by inert gases?

What is wind ?

Which is the most abundant gas in our atmosphere?

Name the sources of carbon dioxide in air.

Name the major part of air that does not support burning.

Oxygen and nitrogen form 99% of the air. Other 1% is constitute by which components?

Due to the presence of which gas, when air is passed through lime water turns it milky?

Why does the transparent glass of windows if not wiped regularly appear hazy?

How is air important for life on Earth ?

What is the composition of air?

List five activities that are possible due to the presence of air

Mention some uses of air.

Explain why air is considered a mixture.

List four activities that are possible due to the presence of air.

Akshay went on an adventurous trip with his friends. He went climbing sky diving and underground water diving. He observed that while all the activities were pleasant during water diving, he and his friends felt nauseous and had breathing difficulties. He was aware of same thing happening to his friends a few year back as he was mountain climbing.
(a) Can you suggest a reason behind all the symptoms faced by Akshay and his friends?
(b) How can one recover from this situation?
(c) Give two more special situations where - same symptoms can develop?
(d) If we suffer from breathing problems in deep water. How do plants and animals living in water cope?
(e) Have you observed any good values in Akshay?

How can you say that air contains dust particles?