SSC CGL Science – Human Body I: Digestion, Respiration, Circulation, Excretion – Level 2 · Exam Level · Tier I Sprint

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SSC CGL Science – Human Body I: Digestion, Respiration, Circulation, Excretion – Level 2 · Exam Level · Tier I Sprint – 17 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.  
Diagram-basedIn the heart shown (front view), which chamber pumps oxygenated blood to the whole body?

Correct Answer: B [S]

Explanation:

S = left ventricle (lower right of the picture, thick wall, red) → aorta.

2.  
Diagram-basedIn the same figure, which chamber receives deoxygenated blood from the body through the vena cavae?

Correct Answer: A [P]

Explanation:

P = right atrium (upper left of the picture, blue).

3.  
Match the followingMatch the enzyme with its action:
P. Pepsin Q. Lipase R. Salivary amylase S. Trypsin
1. Starch, in the mouth 2. Proteins, in the stomach 3. Fats 4. Proteins, in the small intestine

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

Explanation:

Pepsin – stomach proteins; lipase – fats; amylase – starch; trypsin – intestinal proteins.

4.  
A person with blood group A can safely receive red cells from (ignore Rh):

Correct Answer: A [A and O]

Explanation:

Group A plasma has anti-B, so donor cells must lack B → A or O.

5.  
Assertion–ReasonAssertion (A): Bile helps in the digestion of fats although it contains no enzyme.
Reason (R): Bile salts break large fat drops into small droplets.

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

Explanation:

Emulsification gives lipase a much larger surface to act on – R explains A.

6.  
Two-quantity comparison
Quantity I: cardiac output (litres per minute) of a heart beating 72 times a minute with a stroke volume of 70 mL
Quantity II: 5.5 litres per minute

Correct Answer: B [Quantity I < Quantity II]

Explanation:

72 × 70 = 5,040 mL = 5.04 L < 5.5 L.

7.  
Odd one outPick the odd one by the food it digests:

Correct Answer: D [Lipase]

Explanation:

Trypsin, pepsin and rennin act on proteins; lipase acts on fats.

8.  
The first heart sound 'lub' is produced by the closure of the:

Correct Answer: B [tricuspid and bicuspid valves]

Explanation:

Lub – AV valves close; dub – semilunar valves close.

9.  
Anaerobic respiration in yeast produces:

Correct Answer: D [ethanol and carbon dioxide]

Explanation:

Yeast ferments glucose to ethanol + CO₂; muscles make lactic acid.

10.  
Spot My Mistake“Group O is the universal recipient because its red cells have no antigens.” What is the correct statement?

Correct Answer: B [O is the universal donor; AB is the universal recipient]

Explanation:

No antigens → O can give to all; no antibodies → AB can receive from all.

11.  
Reverse questionThe answer is “Spleen”. Which question does it answer?

Correct Answer: C [Where are worn-out red blood cells destroyed?]

Explanation:

Spleen – graveyard of RBCs; liver makes bile; red bone marrow makes RBCs; kidney forms urine.

12.  
Arrange in orderArrange in the order in which urine passes: Urethra, Kidney, Urinary bladder, Ureter

Correct Answer: A [Kidney → Ureter → Urinary bladder → Urethra]

Explanation:

Kidney → ureter → bladder → urethra.

13.  
Fill in the blankADH (antidiuretic hormone) increases the reabsorption of ______ in the kidney.

Correct Answer: B [water]

Explanation:

ADH makes the collecting duct draw back water – less, more concentrated urine.

14.  
Data tableA report reads: BP 150/95 mm Hg; RBC 5.2 million/mm³; WBC 7,000/mm³; platelets 2,50,000/mm³. Which value is outside the normal range?

Correct Answer: A [Blood pressure]

Explanation:

150/95 is above 140/90 (hypertension); the others are in NCERT's normal ranges.

15.  
Fill in the blankUraemia, treated by haemodialysis, is the accumulation of ______ in the blood.

Correct Answer: D [urea]

Explanation:

Failed kidneys cannot remove urea; a dialysis machine filters the blood.

16.  
Which statement correctly distinguishes breathing from cellular respiration?

Correct Answer: C [Breathing moves air; respiration releases energy from food in cells]

Explanation:

Breathing – physical, lungs; respiration – chemical, every cell, ATP.

17.  
About what share of the carbon dioxide in blood is carried by haemoglobin as carbamino-haemoglobin?

Correct Answer: C [20–25%]

Explanation:

About 70% as bicarbonate, 20–25% with Hb, about 7% dissolved in plasma.

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