The correct answer is (d) iodine.

Here's why:

1. Tadpoles are the larval stage of amphibians, particularly frogs and toads.

2. During metamorphosis, tadpoles undergo significant physiological changes, including the development of lungs and the reabsorption of the tail.

3. One key hormone involved in this process is thyroxine, which is produced by the thyroid gland.

4. The production of thyroxine requires iodine. If iodine is not present in the water, the tadpole's thyroid gland cannot produce thyroxine, and the tadpole will not metamorphose into a frog or toad.

5. Therefore, for the metamorphosis of tadpoles, iodine must be available in the water.

Question

The correct answer is (d) iodine.

Here's why:

1. Tadpoles are the larval stage of amphibians, particularly frogs and toads.

2. During metamorphosis, tadpoles undergo significant physiological changes, including the development of lungs and the reabsorption of the tail.

3. One key hormone involved in this process is thyroxine, which is produced by the thyroid gland.

4. The production of thyroxine requires iodine. If iodine is not present in the water, the tadpole's thyroid gland cannot produce thyroxine, and the tadpole will not metamorphose into a frog or toad.

5. Therefore, for the metamorphosis of tadpoles, iodine must be available in the water.

Knowee AI · Accepted Answer

The correct answer is (d) iodine.

Here's why:

1. Tadpoles are the larval stage of amphibians, particularly frogs and toads.

2. During metamorphosis, tadpoles undergo significant physiological changes, including the development of lungs and the reabsorption of the tail.

3. One key hormone involved in this process is thyroxine, which is produced by the thyroid gland.

4. The production of thyroxine requires iodine. If iodine is not present in the water, the tadpole's thyroid gland cannot produce thyroxine, and the tadpole will not metamorphose into a frog or toad.

5. Therefore, for the metamorphosis of tadpoles, iodine must be available in the water.

For the metamorphosis of tadpoles which of the followingelements must be available in water?(a) chlorine (c) sulphur(b) carbon (d) iodine

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