Question

(i)Both A und R are true and R is correct explanation of the serie

(ii) Both A and R are true and R is not the correct (iii) A is true but R is false

(iv) A is false but R is true Assertion: It is observed that sometimes the tadpoles do not grow into adult frogs in some village

ponds.

Reason: This happens when, the pond water does not contain sufficient amount of iodine need to make thyroxin hormone. Assertion: The voice of a child generally has a lower pitch than that of an adult.

Reason: As one goes through puberty. the larynx becomes bigger and the vocal chords get lengthened​

Answer 1

Answer:

For tadpole one the answer is i)

For larynx one iv)

Explanation:

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.

Before a boy reaches puberty, his larynx is pretty small and his vocal cords are kind of small and thin. That's why his voice is higher than an adult's. But as he goes through puberty, the larynx gets bigger and the vocal cords lengthen and thicken, so his voice gets deeper. Along with the larynx, the vocal cords grow significantly longer and become thicker. In addition, the facial bones begin to grow. Cavities in the sinuses, the nose, and the back of the throat grow bigger, creating more space in the face — which gives the voice more room to resonate.

Answer 2

Explanation:

Assertion: It is observed that sometimes the tadpoles do not grow into adult frogs in some village ponds. 1

Reason: This happens when, the pond water does not contain sufficient amount of sodium need to make thyroxine hormone

(i) Both A and R are true and R is correct explanation of the assertion.

(ii) Both A and R are true and R is not the correct explanation of the assertion.

(iii) A is true but R is false.

(iv) A is false but R is true