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Reaching the Age of Adolescence — Class 8 CBSE Science MCQs with Solutions
Free Class 8 CBSE Science Reaching the Age of Adolescence MCQs with step-by-step solutions. Practise online on Prepizo — no login needed.
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Sample questions with solutions
Q1 — easy
Adolescence generally begins around the age of:
A. 5 years
B. 11 years ✓ Correct
C. 25 years
D. 40 years
Solution: It usually begins around 10 to 11 years.
Q2 — easy
The gland known as the master gland is the:
A. thyroid
B. pituitary ✓ Correct
C. pancreas
D. adrenal
Solution: The pituitary controls other endocrine glands.
Q3 — easy
Which nutrient-rich diet is most important during adolescence?
A. only sweets
B. a balanced diet ✓ Correct
C. only fried food
D. only tea
Solution: Growing bodies need balanced nutrition.
Q4 — hard
Metamorphosis in frogs is controlled by which hormone?
A. insulin
B. thyroxine ✓ Correct
C. adrenaline
D. testosterone
Solution: Thyroxine controls amphibian metamorphosis.
Q5 — hard
Why is personal hygiene especially important during adolescence?
A. Sweat glands become more active, so bacteria can multiply ✓ Correct
B. The body stops sweating
C. Skin becomes waterproof
D. Hair stops growing
Solution: Increased sweat and oil need regular cleaning.
Q6 — hard
Excess secretion of growth hormone during childhood causes:
A. dwarfism
B. gigantism ✓ Correct
C. goitre
D. diabetes
Solution: Too much growth hormone leads to abnormal height.
Q7 — medium
Deficiency of iodine in the diet can cause:
A. goitre ✓ Correct
B. scurvy
C. rickets
D. anaemia
Solution: Iodine is needed for thyroxine production.
Q8 — medium
In humans, the sex of the baby is determined by:
A. the mother only
B. the chromosome contributed by the father ✓ Correct
C. diet
D. the season
Solution: The father contributes either an X or a Y chromosome.
Q9 — medium
The hormone secreted during fear or excitement is:
A. insulin
B. adrenaline ✓ Correct
C. oestrogen
D. thyroxine
Solution: Adrenaline prepares the body for action.