DAV CLASS 5 Science Solutions: We have discussed the solution of class 5 Science book chapter 10 solutions are given below with proper Explanation please bookmark our website for further updates.
Chapter 10 Air DAV Class 5 Science Solution
SOMETHING TO KNOW
A. Fill in the blanks.
1. The two main gases present in the air are nitrogen and oxygen.
2. Animals need oxygen gas for breathing.
3. Plants use carbon dioxide gas to prepare their own food.
4. The process, by which plants prepare their food, is called photosynthesis
5. Ozone gas, present in the atmosphere, protects us from the harmful rays of sunlight.
6. Air, containing impurities, is called polluted air
B. Write True or False for the following statements.
| 1. Pure air is colourless, odourless and tasteless. | Answer: True |
| 2. An empty glass bottle contains air. | True |
| 3. Air gets impure due to the presence of nitrogen gas. | False |
| 4. Leaves of a plant look greener before rain. | False |
| 5. Oxygen is required for burning. | True |
C. Tick (✓) the correct option.
1. The gas, which is present the most in air, is (a) oxygen (b) nitrogen (c) carbon dioxide(d) water vapour
Ans. 1. (b) nitrogen
2. An air pollutant, which exists in solid form, is (a) sulphur (b) nitrogen (c) smoke (d) ozone
Ans. 2. (c) smoke
3. The gas, whose amount varies with weather changes is (a) nitrogen (b) helium (c) water vapour (d) oxygen
Ans. 3. (c) water vapour
4. The gas, that gets reduced, through the process of photosynthesis, is (a) sulphur oxide (b) nitrogen oxide (c) ozone (d) carbon dioxide
Ans. 4. (d) Carbon dioxide
5. When sulphur dioxide reacts with water and oxygen in air, it results in the production of (a) snow (b) acid rain (c) nitrogen oxide(d) carbon dioxide
Ans. 5. (b) acid rain.
D. Answer the following questions in brief.
1. Name the main components of air.
Ans 1. Nitrogen, oxygen and other gases
2. State the meaning of the term ‘Photosynthesis’.
Ans 2. The process by which plants make their own food is called photosynthesis.
3. State two possible harmful effects of ultraviolet rays.
Ans 3. Two possible harmful effects of ultraviolet rays are as follows: (a) It can cause skin and eye diseases (b) It can damage crops
4. Define the term ‘Air pollutant’.
Ans 4. Substances that can pollute the air are called air pollutants.
5. Name any two of the gaseous pollutants present in air.
Ans 5. Carbon monoxide and oxides of sulphur and nitrogen.
6. List any four causes of air pollution.
Ans 6. Four causes of air pollution are as follows: (a) Smoke from automobiles (b) Dust from stone quarries (c) Dust from dust-storm (d) Smoke from factories
E. Answer the following questions.
1. Why is air necessary for animals?
Ans 1. All animals need oxygen to live. All animals take oxygen during breathing. This oxygen is utilized by the body to produce energy. The oxygen comes from the air. Thus, the air is necessary for animals.
2. How is nitrogen important for plants?
Ans 2. Nitrogen is essential for the growth of plants. Plants need nitrogen in large amounts. Plants use nitrogen to make protein.
3. How is the balance of oxygen and carbon dioxide in air, maintained in nature?
Ans 3. All animals use oxygen during respiration and give out carbon dioxide. Plants take up carbon dioxide during photosynthesis and release oxygen. Thus, a balance between carbon dioxide and oxygen is maintained in the air.
4. Why is ‘acid rain’ harmful?
Ans 4. The acid rain damages crops and reduces the fertility of the soil. Acid rain also damages monuments and buildings.
5. Why should we feel ‘worried’ about `global warming’?
Ans 5. Global warming is leading to the melting of polar ice caps. This can cause widespread destruction in the world. So we should be worried about global warming.
6. Suggest some ways of reducing air pollution.
Ans 6. Ways to Reduce Air Pollution
• Plant more trees
• Reduce the use of vehicles
• Regular check-up of vehicles.
• Use of cleaner fuels.
7. How does planting of trees help in making air cleaner?
Ans 7. Trees utilize carbon dioxide during photosynthesis and release oxygen. Thus, trees purify the air. Thus, planting trees help in making the air cleaner.
Chapter 1 |My Body |Class-5 DAV Science Question and Answer
Chapter 2 |Plants |Class-5 DAV Science Question and Answer
Chapter 3 |Forests |Class-5 DAV Science Question and Answer
Chapter 4 |Animals—Our Friends |Class-5 DAV Science Question and Answer
Chapter 5 |Food and Health |Class-5 DAV Science Question and Answer
Chapter 7 |Importance of Water |Class-5 DAV Science Question and Answer
Chapter 8 |Properties of Water |Class-5 DAV Science Question and Answer
Chapter 9 |Fuels |Class-5 DAV Science Question and Answer
Chapter 10 |Air |Class-5 DAV Science Question and Answer
Chapter 11 |Our Solar System |Class-5 DAV Science Question and Answer
Chapter 12 |Observing the Sky |Class-5 DAV Science Question and Answer