Puberty is the period in life at which sexually immature boy or girl becomes sexually mature and capable of reproduction. It happens to be at the age of 11 to 13 years in girls and 13 to 16 years in boys. However, the period may vary from person to person. Puberty ends when an adolescent reaches the reproductive maturity. At puberty, certain changes occur both in boys and girls. Some changes are common in girls and boys such as increase in height, changes in body shape, changes in voice box and voice, etc.
Which of the following statements are correct?
(I) Girls have a high pitched voice.
(II) Salivary glands are ductless glands.
(III) All body parts do not grow at the same rate.
(IV) At puberty, no increase in height takes place.

Options

A. (II) and (IV)
B. (II) and (III)
C. (I) and (IV)
D. (I) and (III)

Answer

To determine which statements about puberty are correct, let's analyze each statement one by one based on the information provided.

### Step 1: Analyze Statement I
**Statement I:** Girls have a high-pitched voice.

- During puberty, girls typically develop a higher-pitched voice compared to boys, who develop a deeper voice. This statement is correct.

### Step 2: Analyze Statement II
**Statement II:** Salivary glands are ductless glands.

- Salivary glands are not ductless; they have ducts that carry saliva to the mouth. Ductless glands are known as endocrine glands, such as the pituitary gland. Therefore, this statement is incorrect.

### Step 3: Analyze Statement III
**Statement III:** All body parts do not grow at the same rate.

- It is true that during puberty, different body parts grow at different rates. For example, some parts may grow faster than others, leading to changes in body shape. This statement is correct.

### Step 4: Analyze Statement IV
**Statement IV:** At puberty, no increase in height takes place.

- This statement is incorrect. During puberty, both boys and girls experience a significant increase in height due to growth spurts. Therefore, this statement is false.

### Conclusion
Based on the analysis:
- **Correct Statements:** I (Girls have a high-pitched voice) and III (All body parts do not grow at the same rate).
- **Incorrect Statements:** II (Salivary glands are ductless glands) and IV (At puberty, no increase in height takes place).

Thus, the correct answers are Statements I and III.

### Final Answer:
The correct statements are I and III.

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