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Practice Class 8 Science MCQ questions based on NCERT concepts about adolescence, puberty, hormones, Adam’s apple, menarche, and human chromosomes with clear exam-focused explanations.
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Chapter Information
Subject: Science
Class: 8
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Moderate
Based On: NCERT-aligned concepts
Introduction
Adolescence is an important stage of human development during which the body undergoes several physical and biological changes. Hormones play an important role in these changes and help the body gradually attain reproductive maturity.
This practice set covers important concepts related to puberty, hormones, reproductive maturity, and chromosomes.
What You Will Learn
✔ Meaning of adolescence
✔ Physical changes during puberty
✔ Role of the pituitary gland
✔ Menarche and puberty
✔ Human chromosome number
Why This Topic Is Important
Understanding adolescence helps students learn how the human body changes during the transition toward reproductive maturity. These concepts are important for school examinations and for building a clear foundation in human biology.
Exam Relevance
These questions are useful for:
✔ NCERT-based examinations
✔ School tests
✔ Unit tests
✔ Half-yearly examinations
✔ Annual examinations
✔ Science revision
Q1. The period of life, when the body undergoes changes, leading to reproductive maturity, is called?
A) Childhood
B) Old age
C) Adolescence
D) Infancy
Answer:
Adolescence
Concept / Exam Explanation
Adolescence is the stage of life during which the body undergoes significant physical and biological changes. These changes gradually lead to reproductive maturity.
Puberty occurs during adolescence and is associated with changes such as growth of the body, development of secondary sexual characteristics, and changes caused by hormones.
Exam Tip
Remember:
Adolescence → Major body changes → Reproductive maturity
Q2. Adam’s apple is prominent in?
A) Boys
B) Girls
C) Both
D) None of these
Answer:
Boys
Concept / Exam Explanation
The Adam’s apple is the visible prominence in the front region of the neck associated with the larynx. During puberty, the larynx grows more noticeably in boys, making the Adam’s apple generally more prominent.
Exam Tip
The growth of the larynx during puberty is also associated with changes in the voice, particularly in boys.
Q3. Which hormone is secreted by the Pituitary gland?
A) Thyroxine
B) Adrenaline
C) Insulin
D) Growth hormone
Answer:
Growth hormone
Concept / Exam Explanation
The pituitary gland produces and releases several hormones, including growth hormone. Growth hormone plays an important role in body growth and development.
The other options are associated with different endocrine glands:
- Thyroxine → Thyroid gland
- Adrenaline → Adrenal glands
- Insulin → Pancreas
Exam Tip
Pituitary gland → Growth hormone
Q4. The first menstrual flow begins at puberty and is termed?
A) Menstruation
B) Menarche
C) Ovulation
D) Menopause
Answer:
Menarche
Concept / Exam Explanation
Menarche refers to the first menstrual period. It generally occurs during puberty and indicates that the reproductive system has undergone an important stage of development.
Do not confuse it with:
- Menstruation → The periodic menstrual flow
- Ovulation → Release of an egg from an ovary
- Menopause → Permanent cessation of menstrual periods later in life
Exam Tip
First menstrual period = Menarche
Q5. How many pairs of chromosomes are found in the nuclei of human cells?
A) 23 pairs
B) 24 pairs
C) 25 pairs
D) 22 pairs
Answer:
23 pairs
Concept / Exam Explanation
Human body cells normally contain 46 chromosomes, arranged into 23 pairs.
These include:
- 22 pairs of autosomes
- 1 pair of sex chromosomes
Therefore:
$$23\text{ pairs}=46\text{ chromosomes}$$
Exam Tip
Remember:
Human somatic cells → 46 chromosomes → 23 pairs
Important Concepts
1. Adolescence
Adolescence is the stage of development in which the body undergoes changes leading toward reproductive maturity.
2. Puberty
Puberty is the period when hormonal changes bring about physical and reproductive development.
3. Pituitary Gland
The pituitary gland produces several important hormones, including growth hormone.
4. Menarche
Menarche = First menstrual period
5. Human Chromosomes
$$46\text{ chromosomes}=23\text{ pairs}$$
Related Practice Questions
- What is puberty?
- Which gland is known for producing growth hormone?
- What is the difference between menarche and menopause?
- How many chromosomes are present in a normal human body cell?
- What are secondary sexual characteristics?
Mini Quiz Challenge
1. Which gland produces growth hormone?
A) Thyroid
B) Pituitary
C) Adrenal
D) Pancreas
Answer: Pituitary gland
2. The first menstrual period is called:
A) Ovulation
B) Menopause
C) Menarche
D) Fertilisation
Answer: Menarche
3. How many chromosomes are present in human body cells?
A) 23
B) 44
C) 46
D) 48
Answer: 46
Exam Tips
✔ Learn the definition of adolescence clearly.
✔ Remember that growth hormone is secreted by the pituitary gland.
✔ Do not confuse menarche with menopause.
✔ Human body cells normally contain 23 pairs of chromosomes.
✔ Puberty involves several hormonal and physical changes.
Quick Revision Notes
✔ Adolescence → Stage leading toward reproductive maturity.
✔ Pituitary gland → Produces growth hormone.
✔ Adam’s apple → Generally more prominent in boys.
✔ Menarche → First menstrual period.
✔ Human body cells → 46 chromosomes arranged in 23 pairs.
Common Mistakes Students Make
❌ Confusing adolescence with childhood.
❌ Choosing thyroid gland for growth hormone.
❌ Confusing menarche with menstruation.
❌ Confusing menarche with menopause.
❌ Remembering 23 chromosomes instead of 23 pairs for human body cells.
Key Takeaways
- Adolescence is an important stage of human development.
- Puberty brings several physical and biological changes.
- The pituitary gland produces growth hormone.
- Menarche means the first menstrual period.
- Human body cells normally contain 23 pairs of chromosomes.
FAQs
1. What is adolescence?
Adolescence is the stage of life during which the body undergoes changes leading toward reproductive maturity.
2. Which hormone is secreted by the pituitary gland?
Growth hormone is one of the important hormones secreted by the pituitary gland.
3. What is menarche?
Menarche is the first menstrual period.
4. How many pairs of chromosomes are found in human body cells?
Human body cells normally contain 23 pairs of chromosomes.
5. Why does the Adam’s apple become prominent?
The larynx grows during puberty, and this growth is generally more prominent in boys.
Conclusion
Adolescence and puberty involve important physical and hormonal changes in the human body. Understanding concepts such as growth hormone, menarche, Adam’s apple, and chromosome number helps students build a strong foundation in human biology and prepare effectively for Class 8 Science examinations.
NCERT Reference
Reference: NCERT Class 8 Science textbook, “Reaching the Age of Adolescence”, and related NCERT-aligned concepts.
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