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प्रश्न
Explain the importance of carbon dioxide for (a) photosynthesis (b) warming the earth’s environment. State what would happen if excess carbon dioxide as a pollutant is released into the atmosphere.
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उत्तर १
(a) During photosynthesis which occurs during daytime, carbon dioxide and water in the presence of sunlight and chlorophyll is changed into carbohydrates and oxygen is released out.
Hence oxygen in the air is renewed by photosynthesis and therefore the amount of oxygen in air does not get depleted or removed from air.
(b) Infrared (I.R.), visible rays and ultra violet (U.V.) rays are present in the earth’s surface.
The reflected U.V. rays from the earth’s surface pass through the carbon dioxide in the atmosphere, but the I. R. rays are prevented by the carbon dioxide from being radiated out of the earth’s surface. This results in the earth’s environment staying warm. The thick CO2 layer prevents the heat radiations from being radiated out which results into rise in global temperature.
उत्तर २
(a)
During photosynthesis which occurs during daytime, carbon dioxide and water in the presence of sunlight and chlorophyll is changed into carbohydrates, and oxygen is released out.
\[\ce{\underset{\text{(in air)}}{Carbon dioxide} + Water ->[sunlight][chlorophyll] \underset{\text{(glucose)}}{Carbohydrates} + Oxygen}\]
Hence oxygen in the air is renewed by photosynthesis and therefore the amount of oxygen in the air does not get depleted or removed from the air.
(b)
Infrared (I.R.), visible rays and ultraviolet (U.V.) rays are present in the earth’s surface. The reflected U.V. rays from the earth’s surface pass through the carbon dioxide in the atmosphere, but the I. R. rays are prevented by the carbon dioxide from being radiated out of the earth’s surface. This results in the earth’s environment staying warm. The thick CO2 layer prevents the heat radiations from being radiated out which results in a rise in global temperature.
Reason: It results in a rise in global temperature.
संबंधित प्रश्न
We often leave the lights switched on and fans running when we are not in the room. We switch on the air-conditioning even though we don’t really need it. We insist on being dropped to school in the car every day. Thus, we waste valuable energy which is generally produced by burning coal and petroleum. As you know, the burning of these fuels release gases that pollute the atmosphere.
Make a list of the similar things that we do without realizing that we are destroying the environment. Think of the ways that we can behave differently.
State whether the following is true or false.
The temperature drops at the rate of 1°C per 185 metres in the atmosphere.
Imagine that you are an active member of Greenpeace. Write a two-page appeal addressed to the Prime Minister of India stating why you think that increasing the number of vehicles on roads will be disastrous to the nation in the long run.
The atmosphere is divided into ___________ layers.
The upper limit of the troposphere is called as ______.
A layer of Ions inside the Mesosphere is called ______.
This is the earth’s magnetic belt ______.
Why is the troposphere the most important of all the layers of the atmosphere?
The atmosphere is made of ______ different layers.
A ______ shows the direction in which the air is moving at a particular place.
