ECOLOGY
CHEMICAL CYCLES
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In the soil
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Root nodules
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In dead things
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In the atmosphere
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Detailed explanation-1: -Denitrifiers in forests include Alcaligenes, Pseudomonas and Bacillus species as well as Actinobacteria (especially Streptomycetes). They are aggregated in the upper (5 cm) soil layer and around roots and show highest numbers during the cold season [12]. Attention has to be given to denitrifiers found among fungi.
Detailed explanation-2: -Denitrification most commonly occurs in wet or waterlogged soils where the oxygen supply for respiration is restricted. Some fungi can denitrify, but they are not considered significant. When Does It Occur? Denitrification proceeds rapidly when water-filled pore space in soils exceeds 60%.
Detailed explanation-3: -These factors include the amount of organic matter, soil water content, soil oxygen supply, soil temperature, soil nitrate levels and soil pH. A small amount of denitrification can be found taking place in soils all the time. Denitrification becomes significant when the soil is waterlogged for 36 hours or more.
Detailed explanation-4: -It occurs in soils nearing saturation because oxygen becomes increasingly limited. denitrification to proceed. Denitrification rates are faster at hotter temperatures and in alkaline, rather than acidic, soils.
Detailed explanation-5: -Pseudomonas. Explanation for correct option: C. Pseudomonas is a denitrifying bacteria that performs almost the reverse of nitrogen-fixing bacteria.