Q. What is concentration of O₂ in atmosphere?

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Q. What does ionosphere shell consist of ?

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Q. What is percentage of trace gases in atmosphere?

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Q. In which layer of atmosphere temperature remains constant?

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Q. Above tropopause, there lies a

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Q. How many layers are found in atmosphere ?

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Q. Which is lower layer of atmosphere?

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Q. What is average global surface temperature?

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Q. Air density decreases along with

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Q. Zone marking end of troposphere is known as:

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Q. How much kilometer in stratosphere temperature remains constant?

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Q. Which is second major layer of earth's atmosphere ?

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Q. Which ecosystem is very important for man to produce food and fiber?

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Q. Who first gave concept of biosphere?

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Q. Exposure to noise such as traffic, industries, mining can cause

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Q. Which ecosystem generate wealth as well as causes pollution?

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Q. Industrial waste contains highly toxic elements such as lead, mercury, arsenic and

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Q. What is energy input in man subsidized solar powered ecosystem?

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Q. System involved in interconnection of living and non-living organisms is known as

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Q. How many types of an ecosystem is divided into ?

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