Name the microorganisms which can fix atmospheric nitrogen in the soil.
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What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium. What is their role in N2 -fixation?
Rhizobium is a symbiotic bacteria present in the root nodules of leguminous plants. The basic requirements for Rhizobium to carry out nitrogen fixation are as follows: (a) Presence of the enzyme nitrogenase (b)...
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Which among the above can grow on stones; and also help in formation of soil? Write the mode of their action for making soil.
Lichens and Mosses (a) and (b). Lichens and mosses release substances which break down the stones resulting in the formation of soil.
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Fill in the blanks: (a) Microorganisms can be seen with the help of a _________.
Fill in the blanks: (a) Microorganisms can be seen with the help of a ____microscope_____. (b) Blue green algae fix ___nitrogen_____ directly from air to enhance fertility of soil. (c) Alcohol is produced...
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Can microorganisms be seen with the naked eye? If not, how can they be seen?
Microorganisms are too small so they cannot be seen with naked eye. They can be seen with the help of a magnifying glass or microscope
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Fill in the blanks. (a) Plants are called as_________ because they fix carbon dioxide
(a) Plants are called as autotrophs because they fix carbon dioxide. (b) In an ecosystem dominated by trees, the pyramid (of numbers) is of inverted type. (c) In aquatic ecosystems, the limiting...
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Explain the precedure (method) to fix byes.
When the total number of the teams in the tournament are not in the power of 2 then bye is given. The method of bye is First find the next...
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Which one of the following is NOT a factor of soil formation? Time, Soil texture, Organic matter
Answer: (b) Soil texture
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The microorganisms present in the soil require moisture (water) and nutrients for growth and survival.
Answer is (b) Forest
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A shopkeeper wanted to fix a mirror which will give a maximum view of his shop. What type of mirror should he use? Give reason.
He will fix a convex mirror because it can form images of object spread over a large area.
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