In the absence of______ in water,tadpoles cannot change into frogs.

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Solution

Tadpole larvae require thyroxine hormone to undergo metamorphosis and change into adult frogs. Thyroxine synthesis required iodine. Therefore in the absence of iodine in water, tadpoles cannot change into frogs.

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Similar questions

Q. How can a tadpole be prevented to change into frog for long time?

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.

Q. Why do tadpoles growing in iodine deficient waters fail to grow into frogs?

Q. After the rain, tadpoles were found swimming in a pond but not the frogs. This is due to:

Q. Name the process in which tadpoles develop into the young frogs.

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