Our Environment - Worksheets
CBSE Worksheet-01
CLASS - V EVS – Our Environment
A. Name the Following.
1. A natural phenomenon that becomes harmful due to pollution.
2. The pollutant responsible for hole in the ozone layer.
3. A non- renewable resource.
4. A biodegradable material.
5. The gas responsible for acid rain.
6. The wastes which cannot be decomposed by bacteria to form compost.
B. Answer the Following.
1. Explain the changes in temperature with altitude of Earth’s atmosphere.
2. Why there is so little carbon dioxide and more oxygen in our atmosphere?
3. Give the characteristics of four layers of Earth’s atmosphere.
4. What controls the temperature of Earth’s atmosphere?
5. What are the major constituents of Earth’s atmosphere?
CBSE Worksheet-01
CLASS - V EVS – Our Environment
[Answer]
A. Name the Following.
1. Greenhouse effect
2. CFC
3. Fossil fuels
4. Leather belts
5. Oxygen and nitrous oxide
6. Plastic and polythene bags
B. Answer the Following.
1. As you move upward from the surface of Earth, the temperature cools for several kilometers before it reverse and begins to increase (in the stratosphere). This increase ultimately reverses into another decline in temperature, which in turn changes into an increase in temperature at high altitude. The net effect is that the temperature oscillates back and forth over a fairly narrow range of values.
2. Even though carbon dioxide is the most abundant gas released in volcanic processes, it is not the most abundant gas in our atmosphere because it slowly dissolves in the liquid water on Earth and ultimately forms carbonate rocks. The existence of free oxygen in our atmosphere is purely a result of biological activity, specifically photosynthesis.
3. From the surface upward, the layers in Earth’s atmosphere are: troposphere (distinguished by the water cycle, which controls our weather); stratosphere (distinguished by the ozone layer); mesosphere (the top of the greenhouse where CO2 radiates energy to space); and thermosphere (so thin it is easily heated by sunlight).
4. The temperature of any object is determined by the balance of input energy and emitted energy. The temperature of the object rises or falls until the object is able to radiate as much energy as it receives.
5. Our atmosphere is composed primarily of nitrogen (78%) and oxygen (22%).
