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a
Water containing small quantity of D2O used for vegetable growth.
b
Pure heavy water is useful for growth of animals
c
Tobacco seeds can grow in heavy water.
d
Heavy water has color and odor.
answer is A.
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Detailed Solution
Biological and physiological effects of heavy water. In general water contains D2O and T2O, but in very very small quantities according to their natural abundance. Small quantity of heavy water is good for vegetables.