NCERT Solutions Class 6 Science Air Around Us

Scroll down to download pdf file

NCERT Solutions for Class 6 Science for chapter 15 Air Around Us

Question.1

What is the composition of air?

Answer.

Air is a mixture of nitrogen, oxygen, small amount of carbon dioxide, water vapour and some other gases. Nitrogen constitutes 78% of the air. Oxygen

constitutes 21% of the air. Carbon dioxide, water vapour and other gases constitute only 1% of the air.



Question.2

Which gas in the atmosphere is essential for respiration?

Answer.

Oxygen is essential for respiration



Question.3

How will you prove that air supports burning?

Answer.

To prove that air supports burning, we will perform an activity.

To perform this activity, things required are candle, water, container and matchbox.

First of all take a container and fix a candle in the middle of the container. Fill the container with some water. Now, light the candle and container. then cover it with an inverted container

After some time, it is observed that candle extinguishes. Candle extinguishes because the amount of air is limited inside the inverted container. Hence,

supply of oxygen is also limited. Once oxygen is completely consumed, the candle blows off. This proves that oxygen is essential for burning.



Question.4

How will you show that air is dissolved in water?

Answer.

To show that air is dissolved in water, take some water in a pan and heat it slowly. Just before the water begins to boil, look carefully at the bottom of

the pan. Tiny air bubbles are seen at the bottom of the pan before the water actually boils. These air bubbles come from the air dissolved in water. When

we heat the water, air dissolved in it escapes.



Question.5

Why does a lump of cotton wool shrink in water?

Answer.

A lump of cotton wool shrinks in water because when it is immersed in water, air present in it escapes and it reduces in size.



Question.6

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

Answer.

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



Question.7

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

Answer.

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


Question.8

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

Answer.

Activities that are possible due to the presence of air are:

1. Photosynthesis
2. Respiration
3. Flight of birds, bats and insects
4. Movement of sailing yachts, gliders, parachutes and aeroplanes
5. Generation of electricity by windmill



Question.9

How do plants and animals help each other in the exchange of gases in the atmosphere?

Answer.

During photosynthesis plants take carbon dioxide from atmosphere and make their own food and oxygen is produced in this process. Plants also

consume oxygen during respiration but amount of oxygen released during photosynthesis is more than the amount of oxygen used during respiration.

Animals inhale oxygen produced by plants and in turn, carbon dioxide is produced.

In this way, plants and animals help each other in the exchange of gases in the atmosphere. 

 

 

 

Tags: 

Click on the text For more study material for Science please click here - Science

Latest CBSE News

  • Its expected that CBSE will release the results for class 10and class 12 board exams by end of next week. The results will be declared by many mediums so that students across the country don’t face any issues regarding accessibility to results due to sudden pressure on CBSE results website like previous years. The Central Board of Secondary Education's CBSE Class 12th result 2018 and CBSE Class...
  • CBSE has issued circular explaining the details regarding re evaluation process for class 12 and class 10. Read the details below.. 1. Verification of Marks a)  Request for verification can be submitted only online from website of CBSE  www.cbse.nic.in along with fee of Rs.500/- per subject as per schedule given in Annexure-I. b)  In case applying from India the requisite fee of Rs.500/- per...
  •  The government of Delhi has instructed 575 schools to return excess fees charged from parents with 9% interest. The list of the 575 schools is as under. Also, the notice issued by the govt says " In  continuation of orders dated 22.02.2018, 03.07.2017, 01.07.2016, 15.03.2016, 20.10.2015, 21.10.2014 and 28.02.2013 and in  exercise of the powers conferred under  rule   SO(xviii)  j  Section  24(3...
  • CBSE has issued the following circular regarding celebrating World Environment Day: World Environment Day is celebrated on June 5 every year. This year India is hosting the World Environment Day 2018 at global level in collaboration with UN Environment on the theme “Plastic Pollution" You are, therefore, requested to sensitize students by organizing awareness programmes on environmental...
  • For awarding the grades, the Board shall put all the passed students in a rank order and will award grades as follows: · A-1 Top 1/8th of the passed candidates· A-2 Next 1/8th of the passed candidates· B-1 Next 1/8th of the passed candidates· B-2 Next 1/8th of the passed candidates· C-1 Next 1/8th of the passed candidates· C-2 Next 1/8th of the passed candidates· D-1 Next 1/8th of the passed...
  • Honourable Prime Minister Shri Narendra Modi ji said "It is our responsibility to ensure that the right spirit of yoga is conveyed to everyone." To promote wellbeing and awareness about Yoga amongst students, the Ministry of Human Resource Development (MHRD) through National Council of Educational Research and Training (NCERT) is taking multi-dimensional initiative to promote Yoga in curriculum...