DAV Class 5 Science Chapter 10 Question Answer Air

If you are looking for DAV Class 5 Science Chapter 10 Question Answer Air, then you are at right place. Here at SOLUTIONGYAN.Com, DAV Class 5 Science solutions of chapter 10 Air exercises provided at the end of the chapter will be a useful resource for DAV Class 5 Science exams.

Here, we provide complete solutions of DAV Class 5 Science Chapter 10 Air of My Living World science book. These exercise of Science chapter 10 contains 5 questions (Fill in the blanks, True or False, Tick the correct option, etc.) and the answers to them are provided in the DAV Class 5 Science Chapter 10 Question Answer Air.

Solutions of DAV Class 5 Science chapter 10 Air help to boost the writing skills of the students, along with their logical reasoning. Students can go through class 5 Science chapter 10 question answers to learn an effective way of expressing their answers in the exam.

DAV Class 5 Science Chapter 10 Air Solutions

DAV Class 5 Science Chapter 10 Air Solutions is given below. Here DAV Class 5 Science chapter 10 question answer is provided with great explanation.

Highlights

• Fill in the blanks
• Write True or False
• Tick the correct option
• Answer the following questions in brief
• Answers the following questions

DAV Solutions of Class 5 of My Living World Science Textbook is the best source for the students to self-analyse their performance. DAV Class 5 students are more likely to score good marks in Science exam if they practise DAV Class 5 Science Chapter 10 Question Answer Air regularly.

DAV Class 5 Science Chapter 10 Question Answer

A. Fill in the blanks.

1. The two main gases present in the air are ___________ and ___________.

2. Animals need ___________ gas for breathing.

3. Plants use ___________ gas to prepare their own food.

4. The process, by which plants prepare their food, is called ___________.

5. ___________ gas, present in the atmosphere, protects us from the harmful rays of sunlight.

6. Air, containing impurities, is called ___________.

Answer: (1) nitrogen, oxygen (2) oxygen (3) carbon dioxide (4) photosynthesis (5) Ozone (6) polluted air.

B. Write True or False for the following statements.

1. Pure air is colourless, odourless and tasteless.

2. An empty glass bottle contains air.

3. Air gets impure due to the presence of nitrogen gas.

4. Leaves of a plant look greener before rain.

5. Oxygen is required for burning.

Answer: (1) True (2) True (3) False (4) False (5) True.

C. Tick the correct option.

1. The gas, which is present the most in air, is-

Answer: nitrogen

2. An air pollutant, which exists in solid form, is-

Answer: smoke

3. The gas, whose amount varies with weather changes, is-

Answer: water vapour

4. The gas, that gets reduced, through the process of photosynthesis, is-

Answer: carbon dioxide

5. When sulphur dioxide reacts with water and oxygen in air, it results in the production of-

Answer: acid rain

D. Answer the following questions in brief.

1. Name the main components of air.

Answer: Nitrogen (78%), Oxygen (21%) and other gases (carbon dioxide, water vapour, helium, Ozone, hydrogen, etc.)

2. State the meaning of the term ‘Photosynthesis’.

Answer: The process of making food by green plants in presence of sunlight is called photosynthesis.

3. State two possible harmful effects of ultraviolet rays.

Answer: two possible harmful effects of ultraviolet rays are –

• Cause skin and eye diseases in animals.
• Affect the growth of plants.

4. Define the term ‘Air pollutant’.

Answer: The impurities present in air are called air pollutants.

5. Name any two of the gaseous pollutants present in air.

Answer: Carbon monoxide and oxides of nitrogen.

6. List any four causes of air pollution.

Answer: four causes of air pollution are-

• Dust raised from the ground during dust storm.
• Smoke emitted by vehicles.
• Smoke raised by burning of coal in power houses.
• Burning of wood, cow dung cakes, garbage, etc.

E. Answers the following questions.

1. Why is air necessary for animals?

Answer: All animals, including human beings, need air because they take oxygen from air through the process of breathing. The oxygen is used to produce energy from the food that is eaten.

2. How is nitrogen important for plants?

Answer: Nitrogen is important for plant because –

• Nitrogen helps in the rapid growth of plants.
• It also helps them to develop their fruits and seeds.
• It also increases the size and quality of their leaves.

3. How is the balance of oxygen and carbon dioxide in air, maintained in nature?

Answer: Animals and human beings use oxygen present in the air and give out carbon dioxide gas. Plants, on the other hand, consume carbon dioxide during photosynthesis and give out oxygen. In this way, a balance of carbon dioxide and oxygen is maintained in the air.

4. Why is ‘acid rain’ harmful?

Answer: Acid rain is harmful because –

• It damages crops and reduces the fertility of soil.
• It can also damage monuments made up of marble.

5. Why should we feel worried about ‘global warming’?

Answer: We should feel worried about global warming because this can result in an increase in the melting of polar ice caps which can cause widespread damage and destruction.

6. Suggest some ways of reducing air pollution.

Answer: Some ways to reduce air pollution are as follows:

• We should plant more and more trees.
• Lesser use of vehicles.
• Regular checkup of vehicles.
• Use of cleaner fuels.
• Dumping the garbage in a pit.

7. How does planting of trees help in making air cleaner?

Answer: Planting of trees help in making air cleaner because plants use up carbon dioxide gas present in the air for producing their food using photosynthesis.