A) \[7\times {{10}^{13}}kg/yr\]
B) \[7\times {{10}^{13}}kg/yr\]
C) \[7\times {{10}^{10}}kg/yr\]
D) \[7\times {{10}^{13}}kg/yr\]
Correct Answer: B
Solution :
Green plants fix about 70-80 billion tonnes of carbon dioxide annually by the process of photosynthesis. Out of total \[C{{C}_{2}}\]fixed, about 90% is fixed by water plants and less.tt 10% is fixed by terrestrial plants. Since, 1 billion = 1000 rnilion or 109 and 1 ton = 1000 kg therefore, 70 billion tonnes/year is equal to \[70\times {{10}^{9}}\times {{10}^{3}}=7\times {{10}^{13}}\,kg\]per year
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