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It was observed that the tadpoles are not growing into adult frogs in a village pond. A scientist who was asked to find the reason for this concluded that the pond water did not contain a sufficient amount of a mineral P which could make a hormone Q. The hormone Q can cause a phenomenon R in tadpoles so that they become adult frogs. (a) What are (i) P (ii) Q, and (iii) R? (b) Name one human disease which can also be caused due to the deficiency of P in the food and water. |
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Answer» It was observed that the tadpoles are not growing into adult frogs in a village pond. A scientist who was asked to find the reason for this concluded that the pond water did not contain a sufficient amount of a mineral P which could make a hormone Q. The hormone Q can cause a phenomenon R in tadpoles so that they become adult frogs. (a) What are (i) P (ii) Q, and (iii) R? (b) Name one human disease which can also be caused due to the deficiency of P in the food and water. |
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