SSC CGL Science – Human Body I: Digestion, Respiration, Circulation, Excretion – Level 1 · Warm-up · Tier I Level

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SSC CGL Science – Human Body I: Digestion, Respiration, Circulation, Excretion – Level 1 · Warm-up · Tier I Level – 14 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 which part of the alimentary canal does almost no digestion take place, while water is absorbed?

Correct Answer: A [Large intestine]

Explanation:

The large intestine secretes no digestive enzymes; it absorbs water and some minerals.

2.  
The enzyme present in saliva is:

Correct Answer: B [Salivary amylase]

Explanation:

Salivary amylase converts starch to maltose.

3.  
The normal heart rate of a healthy adult at rest is about:

Correct Answer: C [72 beats per minute]

Explanation:

About 72 per minute (cardiac cycle ≈ 0.8 s).

4.  
The average life span of a human red blood cell is about:

Correct Answer: D [120 days]

Explanation:

About 120 days; then destroyed in the spleen.

5.  
Which blood group is called the universal donor?

Correct Answer: A [O]

Explanation:

O red cells carry no A or B antigen.

6.  
The structural and functional unit of the kidney is the:

Correct Answer: D [Nephron]

Explanation:

About one million nephrons in each kidney.

7.  
Exchange of gases in the lungs takes place in the:

Correct Answer: B [Alveoli]

Explanation:

Alveoli – thin-walled air sacs surrounded by capillaries.

8.  
Fill in the blankThe protein-digesting enzyme trypsin is secreted by the ______.

Correct Answer: C [pancreas]

Explanation:

Pancreatic juice contains trypsinogen (activated to trypsin), amylase and lipase; the stomach secretes pepsin.

9.  
The iron-containing pigment that carries oxygen in blood is:

Correct Answer: B [Haemoglobin]

Explanation:

Haemoglobin in RBCs carries about 97% of oxygen.

10.  
Blood pressure is measured with a:

Correct Answer: C [Sphygmomanometer]

Explanation:

Sphygmomanometer measures BP; spirometer measures lung volumes.

11.  
How many permanent teeth does a normal adult human have?

Correct Answer: D [32]

Explanation:

2-1-2-3 in each half-jaw × 4 = 32; milk teeth 20.

12.  
In jaundice, the skin and eyes turn yellow because of the deposit of:

Correct Answer: A [bile pigments]

Explanation:

The liver is affected and bile pigments (bilirubin) collect in the body.

13.  
Which mild base is commonly used as an antacid for acidity?

Correct Answer: C [Milk of magnesia (magnesium hydroxide)]

Explanation:

Magnesium hydroxide neutralises excess stomach acid.

14.  
True/False drillhow many are TRUE?
I. The pulmonary vein carries oxygenated blood.
II. Urea is formed in the kidneys.
III. Platelets help in clotting of blood.
IV. The small intestine is the longest part of the alimentary canal.

Correct Answer: D [Three]

Explanation:

Only II is false – urea is made in the liver; kidneys remove it.

➤ 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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