Changes at Puberty

Q.

What is the main function of the thyroxine hormone?

Q.

What is puberty?

Q.

(a) What is meant by the 'primary sexual characteristics' in humans? State two primary sexual characteristics in boys and two in girls.

(b) What is meant by 'secondary sexual characteristics' in humans? Explain with the help of two examples.

Q.

All of the following are eliminated by sebaceous glands through sebum except:

1. Sterols

2. Proteins

3. Hydrocarbons

4. Waxes

Q.

The protruding part of the throat in boys is called ___ .

Q.

Boys have broader shoulders and wider chests compared to girls. This is because:

1. both A and B are correct

2. none of the above is correct

3. broad shoulders increase oxygen supply to the muscles

4. muscles grow more prominently in boys

Q.

What is Adam's Apple ? Which of the two usually have an Adam's Apple : grown up boys or grown up girls ?

Q. Write a short note on adam's apple.
[3 MARKS]

Q.

How do shoulders and chest change in boys during puberty ?

Q.

Pimples and acne are fomed due to the increased activity of :

A. Adrenal glands B. Sebaceous glands C. Thyroid gland D. Sweat glands

(a) A and B (b) B and C (c) A and C (d) B and D

Q. Why acne and pimples are common in adolescents?

Q.

What substance is secreted by sebacious glands ?

Q.

(a) What changes take place in boys during puberty?

(b) What changes take place in girls during puberty?

Q.

A nine year old boy is 120 cm tall. If the present height of the boy is $75\%$ of his full height, calculate the full height which the boy will eventually reach at the end of growth period.

Q.

Initially girls grow faster than boys but at 18 years of age, both reach their maximum height. Given the reason, why?

Q.

How do hips of girls change during puberty ?

Q.

Which of the two have a smaller voice box : grown up boys or grown up girls ?

Q.

Select the correct statements about increase in height from the following statements.

i. A sudden increase in height is seen during adolescence due to growth hormones.
ii. Girls grow faster than boys initially during adolescence.
iii. At the end of adolescence, maximum height is reached.

1. i and ii

2. ii and iii

3. i and iii

4. i, ii and iii

Q.

Poor hygiene has the most direct effect on which body system?

1. Endocrine system

2. Respiratory system

3. Immune system

4. Nervous system

Q.

Why is personal hygiene important?

1. One

2. Two

3. Four

4. Eight

Q.

What change in the voice of boys takes place when they reach puberty ? What is the cause of this change ?

Q.

What are pimples? How are pimples formed?

Q. Which of the following will occur in females at puberty?
(I) Ovulation
(II) Enlargement of breasts
(III) Broadening of hips

1. I and II only
   
2. I and III only
   
3. II and III only
   
4. I, II and III

Q.

The change in voice of boys during puberty is due to enlargement of:

1. Jaw bone

2. Larynx

3. Pharynx

4. Nostrils

Q.

Find the correct set of differences for boys and girls during puberty from the following table.
$$\begin{array}{cc}\text{Boys}& \text{Girls}\\ \text{A}.\text{Larynx does not grow much}& \text{Larynx begins to grow very big}\\ \text{B}.\text{Voice box grows to form Adam's apple}& \text{No Adam's apple formation}\\ \text{C}.\text{No cracking of voice}& \text{Cracking of voice takes place}\\ \text{D}.\text{Boys have a high pitched voice}& \text{Girls have a deep voice}\end{array}$$

1. C

2. A

3. D

4. B

Q.

What is acne?

Q.

Which of the following are changes seen in boys during adolescence?

1. Broadening of shoulders

2. Growth of facial and body hair

3. Widening of hips

4. Deepening of voice

Q. The growing voice box in boys can be seen as a protruding part of the throat called ________.

1. Uvula
2. Gullet
3. Epiglottis
4. Adam's apple

Q.

Name two glands present in the skin whose increased activity causes pimples and acne.

Q.

What are the 4 personality disorders?