SSC CGL Science – Human Body I: Digestion, Respiration, Circulation, Excretion – Level 3 · Challenge

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SSC CGL Science – Human Body I: Digestion, Respiration, Circulation, Excretion – 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. Pepsin acts in an acidic medium.
II. Bile contains the enzyme lipase.
III. Villi increase the surface area for absorption.

Correct Answer: A [I and III only]

Explanation:

Bile has no enzyme; lipase comes from pancreatic juice.

2.  
A heart beats 90 times a minute and pumps 65 mL per beat. Its cardiac output is:

Correct Answer: D [5.85 L per minute]

Explanation:

90 × 65 = 5,850 mL ≈ 5.85 L per minute.

3.  
The dental formula of an adult human (teeth in one half of the upper jaw / one half of the lower jaw: incisors, canine, premolars, molars) is:

Correct Answer: B [2123/2123]

Explanation:

2 incisors, 1 canine, 2 premolars, 3 molars in each half-jaw → 8 × 4 = 32 teeth.

4.  
Match the followingMatch the nephron part with its main job:
P. Glomerulus Q. Proximal convoluted tubule R. Loop of Henle S. Collecting duct
1. Concentrating urine 2. Filtration 3. Water reabsorption under ADH 4. Reabsorbing glucose and amino acids

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

Explanation:

Glomerulus filters; PCT reabsorbs nutrients; loop concentrates; collecting duct – ADH.

5.  
Assertion–ReasonAssertion (A): The left ventricle has the thickest wall of the four chambers.
Reason (R): The left ventricle pumps blood to the lungs.

Correct Answer: C [A is true but R is false]

Explanation:

A true; R false – the left ventricle pumps to the whole body; the right ventricle pumps to the lungs.

6.  
How many of the four ABO groups can safely give red cells to a person of group AB (ignore Rh)?

Correct Answer: D [Four]

Explanation:

AB has both antigens and no anti-A or anti-B antibodies, so A, B, AB and O cells are all safe – the universal recipient.

7.  
Statement-basedWhich pair is NOT correctly matched?

Correct Answer: A [Pulmonary artery – oxygenated blood]

Explanation:

The pulmonary artery carries deoxygenated blood to the lungs.

8.  
True/False drillhow many are TRUE?
I. Fish have a double circulation.
II. Mature human RBCs have no nucleus.
III. Neutrophils are the most abundant WBCs.
IV. A normal platelet count is 6,000–8,000 per mm³.

Correct Answer: B [Two]

Explanation:

Fish have single circulation; 6,000–8,000 is the WBC count (platelets 1.5–3.5 lakh).

➤ 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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