1.(a)
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2.(a)
3.(d)
4. (c)
(i)air, the water and the soil
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(ii)CO2
(iii)Transpiration
(iv)Nitrogen
Carbon monoxide (CO)
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Sulphur dioxide (SO2)
Nitrogen dioxide (NO2)
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A species of bacteria called Rhizobium
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Combustion
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Methane, Carbon dioxide , Ozone
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CFC(Chloro flouro carbons)
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When water bodies are heated during the day, a considerable amount of water evaporates and enters the atmosphere. Water vapour is also released into the atmosphere as a result of biological processes. This air is also heated. The warm air rises, carrying with it the water vapour. The rising air cools down and expands. As a result of this cooling, the water vapour in the air condenses into small droplets. Water condensation is aided if some particles act as the 'nucleus' around which these drops form. This function is normally performed by dust and other suspended particles in the air.
The 'condensation' of these water droplets causes them to grow larger once produced. These are called clouds .When the drops have become large and heavy, they fall to the ground like rain.
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Some gases hinder heat from escaping from the Earth. An increase in the amount of such gases in the atmosphere would cause global average temperatures to rise, which is known as the greenhouse effect.
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The cycle of transfer of matter and energy between the the biotic and abiotic components of the biosphere is called the biogeochemical cycles.
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The cycles are Carbon cycle, Nitrogren cycle and water cycle
Respiration by plants and animals
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Combustion of fuels
decomposition of dead organic matter.
Refinery release sulplur dioxide in the atmosphere. sulplur dioxide combines with water to form sulphuric acid and which cause acid rain and it destroy the quality of the marble
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Ozone
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Yes, it saves us from ultravoilet rays
When we look at the situation in coastal regions throughout the day, we can see that the air above the land heats up faster and begins to rise. As this air rises, a region of low pressure forms, and air over the sea moves into this region of low pressure. Winds are caused by the movement of air from one location to another. During the day, the wind would be blowing from sea to land and this is called sea breeze
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During the night, both land and sea start to cool. Since water cools down slower than the land, the air above water would be warmer than the air above land,So it create a low pressure region in sea and then winds happens from land to sea. and this is called land breeze
(i) Eutrophication is the process by which algae develop excessively in a body of water due to an overabundance of minerals and nutrients.
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(ii) The bacterial breakdown of the algae may result in oxygen depletion of the water body.
(iii) An "algal bloom" is one example.
(iv) The release of nitrate or phosphate-containing detergents, fertilizers, or sewage into an aquatic system usually causes eutrophication.
The lichen grows on the surface of rocks. They produce chemicals that cause the rock surface to powder down and form a thin coating of soil as they grow.
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Small plants, such as moss, can now grow on this surface, causing the rock to break up even more
Trees aid in binding soil particles together and preventing soil erosion.
This Natural Resources Class 9 Important questions and answers is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.