Insufficient production of ........... in the tadpoles leads to their incomplete development.

Thyroxine

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Ductless

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Nutrients

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Deep

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Solution

The correct option is A Thyroxine
Apart from sex hormones, there are other hormones that influence the life cycle of an organism like frogs and causes metamorphism. Metamorphism is due to hormonal effect. Metamorphism in frog is controlled by thyroxine hormone. Iodine is required for the production of thyroxine. Insufficient production of thyroxine leads to incomplete development of tadpoles.
Thus, the correct answer is option A.

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Read the statements given below and fill up the blanks with the correct words listed in the box.
$\begin{matrix} deep, ductless, nutrients, thyroxine \end{matrix}$
(a) The meal that includes all ___ is a balanced diet.
(b) Insufficient production of ___ in the tadpoles leads to their incomplete development.
(c) Endocrine glands are also called ___ glands.
(d) After attaining puberty boys develop a___ voice.

Question 17
Read the statements given below and fill up the blanks with the correct words listed in the box.
$\begin{matrix} d e e p, d u c t l e s s, n u t r i e n t s, t h y r o x i n e \end{matrix}$
(a) The meal that includes all ___ is a balanced diet.
(b) Insufficient production of ___ in the tadpoles leads to their incomplete development.
(c) Endocrine glands are also called ___ glands.
(d) After attaining puberty boys develop a___ voice

Q. Incomplete combustion of carbon is due to insufficient amount of air (oxygen) and leads to the formation of carbon monoxide (CO).

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