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Subject :NSO    Class : Class 10

Fill in the blanks with most appropriate option.
Bio-gas is an excellent fuel as it contains up to 75% __(i)__ . It burns without smoke, leaves no residue like ash in wood. Its heating capacity is __(ii)__ . The slurry left behind is removed periodically and used as excellent manure, rich in __(iii)__and __(iv)__.

(i) (ii) (iii) (iv)
A Methane High Nitrogen Phosphorous
B Nitrogen Low Methane Phosphorous
C Methane Low Nitrogen Oxygen
D Oxygen High Nitrogen Phosphorous

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