SSC CGL Science – Human Body II: Nervous, Endocrine, Skeletal, Muscular & Reproductive Systems – Level 3 · Challenge

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SSC CGL Science – Human Body II: Nervous, Endocrine, Skeletal, Muscular & Reproductive Systems – Level 3 · Challenge – 8 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
Statement-basedWhich is/are correct?
I. Diabetes insipidus is caused by insulin deficiency.
II. Acromegaly is caused by excess growth hormone in adults.
III. Cretinism is linked to thyroid deficiency.

Correct Answer: C [II and III only]

Explanation:

Diabetes insipidus is ADH deficiency.

2.  
A child shows stunted growth and mental retardation (cretinism). The hormone most likely deficient is:

Correct Answer: D [Thyroxine]

Explanation:

Cretinism = thyroid deficiency in childhood; growth hormone deficiency gives a short but mentally normal child.

3.  
How many bones make up the axial skeleton?

Correct Answer: A [80]

Explanation:

22 + 1 + 6 + 26 + 1 + 24 = 80.

4.  
Match the followingMatch the disorder with its description:
P. Gout Q. Osteoporosis R. Tetany S. Myasthenia gravis
1. Loss of bone mass with age 2. Muscle spasms from low calcium 3. Auto-immune disorder of the nerve–muscle junction 4. Uric acid crystals in joints

Correct Answer: B [P-4, Q-1, R-2, S-3]

Explanation:

Gout – uric acid; osteoporosis – bone mass; tetany – low Ca²⁺; myasthenia gravis – auto-immune.

5.  
Assertion–ReasonAssertion (A): Testes lie outside the abdominal cavity in the scrotum.
Reason (R): Sperm formation needs a temperature about 2–2.5 °C lower than body temperature.

Correct Answer: A [Both A and R are true and R is the correct explanation of A]

Explanation:

The scrotum keeps the testes cooler – R explains A.

6.  
Statement-basedWhich pair is NOT correctly matched?

Correct Answer: D [Hypothalamus – balance and posture]

Explanation:

Balance is the cerebellum; the hypothalamus controls hunger, thirst and temperature.

7.  
True/False drillhow many are TRUE?
I. There are 7 cervical vertebrae.
II. The 11th and 12th pairs of ribs are floating ribs.
III. The hip joint is a hinge joint.
IV. Muscle fatigue is linked to lactic acid.

Correct Answer: C [Three]

Explanation:

The hip is a ball and socket joint; the rest are true.

8.  
Data tableRead: Bones in one hand = carpals 8, metacarpals 5, phalanges 14. Bones in one foot = tarsals 7, metatarsals 5, phalanges 14. Which is correct?

Correct Answer: B [The hand has one more bone than the foot]

Explanation:

Hand 27, foot 26 → hand has one more.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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