Q. What is the largest portion in soil?

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Q. What is the main source of energy for living things on earth?

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Q. The worlds wettest and driest places are in

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Q. What is the diameter of sand grain?

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Q. What controls the amount of precipitation is lower or greater than the rate of evapo-transpiration?

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Q. Granite is an example of ?

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Q. Clay soils with high water content can be good for

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Q. What is the measure of concentration of hydrogen ions in a soil?

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Q. Which soils has the large pore spaces between the grains?

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Q. The good balance in the pore spaces between sand and clay gives a supply of

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Q. Which horizon contains many loose pieces of rocks, broken off from the parent rock below by weathering?

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Q. The amount of water trapped in pore spaces is known as

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Q. The removal of soluble minerals and organic matters from the top soil by rain water is known as

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Q. The amount of air present in a soil is known as

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Q. In which soil the nutrient are in short supply?

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Q. Little vegetation survives in the hot deserts of Sahara and Middle east due to

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Q. How many basic constituent is found in soil?

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Q. How carbon dioxide is absorbed in the leaves of higher plants?

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Q. Name the elements of biotics?

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Q. What is eco-system?

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