Microorganisms: Friend and Foe — Science STD 8 — Question
Gujarat BoardEnglish MediumSTD 8ScienceMicroorganisms: Friend and Foe4 Marks
Question
Complete the following cycle given as Fig by filling the blanks $(a), (b), (c) (d)$
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Answer
The cycle given above represents the nitrogen cycle occurring in the environment. The atmospheric nitrogen cannot be up taken by plants and animals as such, this is corrected by some bacteria and blue-green algae present in the soil. These microbes fix the atmospheric nitrogen into usable components which are utilised by other living ’organisms. Nitrogen cycle checks the percentage of nitrogen in the atmosphere and maintains it at a constant level.
$a.$ Lightning fixes nitrogen.
$b.$ Nitrogen fixing bacteria and blue-green algae fix atmospheric nitrogen.
$c.$ Nitrogenous waste from excretion and death.
$d.$ Bacteria turns compounds of nitrogen into gaseous nitrogen.
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