B. FILL IN THE BLANKS :
1. Four-fifth part of the air is
2. The component which supports combustion is
3. Green plants need
to prepare the
4. The products of combustion and respiration are
5. Air is a matter because it has
and
6. Air is a mixture of ..
gases
7. Air pollution can be prevented by using
Answers
Explanation:
1. To show that about one-fifth of air is oxygen and the rest four-fifth is nitrogen.
2. Air contains some matter which supports combustion. This substance is oxygen. Oxygen is one of the major components of air around
3.The leaves contain a pigment called chlorophyll, which colors the leaves green. Chlorophyll can make food the plant can use from carbon dioxide, water, nutrients, and energy from sunlight. This process is called photosynthesis. During the process of photosynthesis, plants release oxygen into the air.
4.The burning of fossil fuel in the presence of oxygen generates heat and energy and carbon dioxide is released into the environment. Whereas in case of respiration, the glucose is burned in the presence of oxygen and carbon dioxide and water is released by the body.
5.Air is classified as matter because it has mass and takes up space, which is the definition of matter.
6.Air is the invisible mixture of gases that surrounds the Earth. Air contains important substances, such as oxygen and nitrogen, that most species need to survive.
7.Reduce the number of trips you take in your car. Reduce or eliminate fireplace and wood stove use. Avoid burning leaves, trash, and other materials. Avoid using gas-powered lawn and garden equipment.
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