Milo found some tadpoles in a pond and caught a few in a bottle. He grew those in a small glass water tank and supplied them with proper tadpole food. Despite all these efforts, the tadpoles never grew into adults. Which of the following can be a possible reason?

Tadpoles cannot grow in glass tanks.

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Lack of mother's milk.

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Lack of iodine in water.

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Lack of chlorine in water.

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Solution

The correct option is C Lack of iodine in water.
In frogs, metamorphosis is controlled by thyroxine, the hormone produced by thyroid gland. Thyroxine production requires the presence of iodine. If the water in which the tadpoles are growing does not contain sufficient iodine, the tadpoles cannot become adults.

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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.

Q. A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.
(a) Construct a food chain for the pond.
(b) How many links are there in this chain?

A student went to study a local pond. In one part of the pond, she noticed tadpoles scraping at some pondweed. In another part, she saw a water beetle holding a tadpole in its jaws.

(a) Construct a food chain for the pond.

(b) How many links are there in this chain?

With respect to the assertion (A) and reason (R), which of the following is correct option?

A: A tadpole deprived of thyroid gland fails to metamorphose into an adult.

R: Thyroxine stimulates tissue differentiation and, therefore, affects metamorphosis of a tadpole into an adult frog.

Q. The process by which tail of tadpole is dissolved and tadpole changes into adult is known as

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