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 sufficient amount of a mineral P which could make a hormone Q. The hormone Q can causes a phenomenon R in tadpoles so that they become adult frogs.
(a) What are (i) P (ii) Q, and (ii) 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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(i) P is Iodine (ii) Q is Thyroxine and (ii) R is metamorphosis
(b) Goiter.
Explanation:
(a) (i) P is Iodine (ii) Q is Thyroxine and (ii) R is metamorphosis
(b) One human disease which can also be caused due to the deficiency of Iodine in the food and water is Goiter.
Iodine is essential for production of thyroxine hormone.
Metamorphosis is a biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation. Thyroxine is a hormone necessary for the process of metamorphosis of a tadpole into an adult frog.
Goiter is a condition caused by an enlarged thyroid gland due to Iodine deficiency in humans.
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