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Changes at Puberty

1. MALE- Crac...

Question

1. MALE- Cracking of voice, appearance of beard, secretion of testosterone, growth of hair in armpit. FEMALE- onset of monthly periods, enlargement of breasts, appearance of hair in armpits, widening in hip region.

2. MALE- growth of hair on scalp, excess secretion of digestive enzymes, increase in circulation in skin, enlargement of voice box. FEMALE- More secretion of keratin for hair growth, lightening of skin, more secretion of salivary amylase, darkening of pupil in eyes.

Which of the above are true in regards to sexual maturation?

A

Both 1 and 2

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B

Only 1

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C

Only 2

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D

Both are wrong

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Solution

The correct option is B
Only 1

Changes mentioned in group A happen in both males and females.

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Similar questions

Q. Question 23
In human females, an event that reflects onset of reproductive phase is

(a) growth of body
(b) changes in hair pattern
(c) change in voice
(d) menstruation

Q. Which of these is not a secondary sex characteristic?
(a) increase in height
(b) release of testosterone
(c) voice change
(d) hair growth on body

Q. Teacher asked some students to identify the secondary sexual characters that are common to both male and female.
(i) Body becomes muscular.
(ii) Thick hair growth in the pubic regions.
(iii) Breasts size begin to increase.
(iv) Skin becomes frequently oily.
(v) Occurrence of acne.
(vi) High pitched voice.
(vii) Thin hair appears on legs and arms.
Here are the answers given by the students:
Aarti — (i), (iii), (iv), (vii)
Puja — (ii), (iv), (v) (vi)
Atul — (i), (ii), (iii), (vii)
Abhishek — (ii), (iv), (v), (vii)
Amongst them, who has identified atleast three sexual characters correctly?

Q. The female hormone that causes deposition of fat in the breast, and hips and the growth of pubic hairs during puberty is

Q. In rabbits, black skin (B) is dominant over brown skin (b) and short hair (S) is dominant over long hair (s). If a homozygous black skin, short-haired male is crossed with a homozygous brown skin, long-haired female, all

F_{1}

offspring are heterozygous black and short-haired. What would be the percentage of the homozygous black skin, short-haired offspring, if a male and female of

F_{1}

generation are made to breed?

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Changes at Puberty

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