MCQ(Solution) - Reaching The Age of Adolescence | Science Class 8 PDF Download

Q1: What is the primary physical change during puberty?

(a) Increased intellectual development
(b) Broadening of shoulders and chest in boys
(c) Voice box enlargement in girls
(d) Decrease in height

Correct Answer is Option (b)
Puberty is marked by various physical changes, and one of the most noticeable changes is the broadening of shoulders and chest in boys due to puberty-related growth.

Q2: What triggers the increased secretion of sweat and oil glands during puberty? 

(a)  Intellectual development 
(b) Hormones 
(c) Height growth 
(d)  Muscle development 

Correct Answer is Option (b)
The increased secretion of sweat and oil glands during puberty is triggered by hormones, which are chemical substances that regulate various changes in the body. 

Q3:  Which hormone is responsible for the development of facial hair in boys during puberty? 

(a)  Estrogen 
(b)  Thyroxine 
(c)  Testosterone 
(d)  Insulin 

Correct Answer is Option (c)
Testosterone, the male hormone, is responsible for the development of facial hair in boys during puberty. 

Q4:  When does the menstrual cycle typically begin for females? 

(a) 6-8 years 
(b)  10-12 years 
(c) 14-16 years 
(d) 18-20 years 

Correct Answer is Option (b)
The menstrual cycle, marked by the onset of menarche, typically begins for females around the ages of 10 to 12 years. 

Q5:  What is the role of the pituitary gland in puberty-related changes? 

(a) It regulates the production of sex hormones 
(b)  It controls voice box growth 
(c)  It influences muscle development 
(d) It triggers height spurts 

Correct Answer is Option (a)
The pituitary gland plays a crucial role in puberty-related changes by regulating the production of sex hormones that lead to various physical and reproductive developments. 

Q6: Which hormone is produced by the ovaries and contributes to breast development in girls? 

(a) Testosterone 
(b) Insulin 
(c) Estrogen 
(d) Thyroxine 

Correct Answer is Option (c)
Estrogen, the female hormone, is produced by the ovaries and contributes to breast development in girls during puberty. 

Q7:  What is the term for the period when menstrual cycles cease, typically around 45 to 50 years of age? 

(a) Menarche 
(b) Menstruation 
(c) Menopause 
(d)  Metamorphosis 

Correct Answer is Option (c)
 Menopause is the term used to describe the period when menstrual cycles cease, typically occurring around 45 to 50 years of age. 

Q8:How is the sex of the baby determined? 

(a) Mother's hormones 
(b)  Father's hormones 
(c)  Random genetic factors 
(d) Combination of X and Y chromosomes 

Correct Answer is Option (d)
The sex of the baby is determined by the combination of X and Y chromosomes, with females having two X chromosomes and males having one X and one Y chromosome. 

Q9:  What hormone, produced by the thyroid gland, is necessary for tadpole growth into adults during frog metamorphosis? 

(a) Testosterone 
(b) Estrogen 
(c) Thyroxine 
(d) Insulin 

Correct Answer is Option (c)
Thyroxine, produced by the thyroid gland, is necessary for tadpole growth into adults during frog metamorphosis. 

Q10:Why is saying "NO" to drugs emphasized during adolescence? 

(a)Drugs hinder intellectual development 
(b) Drugs are addictive and harmful to health 
(c) Drugs promote muscle development 
(d) Drugs enhance height growth 

Correct Answer is Option (b)
Saying "NO" to drugs is emphasized during adolescence because drugs are addictive, harmful to health, and can negatively impact physical and mental well-being.