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

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SSC CGL Science – Human Body II: Nervous, Endocrine, Skeletal, Muscular & Reproductive Systems – Tier II Level · Marathon – 12 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.  
In a resting neuron, the inside of the membrane is:

Correct Answer: D [negative with respect to the outside]

Explanation:

Resting membrane: outside positive, inside negative (polarised).

2.  
Depolarisation of a nerve fibre is mainly due to the rapid inflow of:

Correct Answer: C [Na⁺ ions]

Explanation:

Na⁺ rushes in → inside becomes positive for an instant.

3.  
Aldosterone, secreted by the adrenal cortex, mainly causes:

Correct Answer: A [reabsorption of Na⁺ and water in the kidney]

Explanation:

Mineralocorticoid – salt and water balance.

4.  
The hormone hCG, detected in pregnancy tests, is produced by the:

Correct Answer: A [placenta]

Explanation:

The placenta makes hCG, hPL and other hormones.

5.  
Ovulation is induced by a surge of which hormone?

Correct Answer: D [LH]

Explanation:

The LH surge in mid-cycle causes the ovum to be released.

6.  
Fill in the blankCalcitonin (thyrocalcitonin) is secreted by the ______ and ______ blood calcium.

Correct Answer: B [thyroid; lowers]

Explanation:

Thyroid – calcitonin lowers; parathyroid – PTH raises.

7.  
Red muscle fibres are able to work for long periods because they have:

Correct Answer: C [plenty of myoglobin and mitochondria]

Explanation:

Myoglobin stores O₂; many mitochondria → aerobic work.

8.  
Which of the following is an auto-immune disorder affecting the neuromuscular junction?

Correct Answer: D [Myasthenia gravis]

Explanation:

Myasthenia gravis – weakness and paralysis of skeletal muscle.

9.  
The joint between the carpal and metacarpal of the thumb is a:

Correct Answer: A [Saddle joint]

Explanation:

Saddle joint – movement in two planes.

10.  
Inside the testes, testosterone is secreted by the:

Correct Answer: B [Leydig (interstitial) cells]

Explanation:

Leydig (interstitial) cells secrete testosterone; Sertoli cells nourish the developing sperm.

11.  
The law in India bans amniocentesis when it is used for:

Correct Answer: C [finding the sex of the foetus]

Explanation:

Its legitimate use is detecting genetic disorders; sex determination is banned.

12.  
How many floating ribs (single bones, both sides together) does a human have?

Correct Answer: B [4]

Explanation:

The 11th and 12th pairs float → 2 pairs = 4 ribs.

➤ 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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