The main function of white blood cells is

Last Updated: 26 Jun 2026

A reliable solution begins by identifying the organ, tissue, cell, hormone, nutrient, pathogen, or biological process named in the stem and then linking it with its precise function or defining feature. The digestive system processes food and absorbs nutrients; the respiratory system exchanges oxygen and carbon dioxide; the circulatory system transports gases, nutrients, hormones, and wastes; the excretory system maintains water, salt, and acid–base balance; the nervous and endocrine systems coordinate responses; and the skeletal, muscular, immune, and reproductive systems perform specialised roles. Questions may also test blood components, vitamins, glands, sense organs, communicable diseases, and deficiency disorders. Students should connect every structure with its location, chief function, associated secretion, and common disorder.

ACarrying oxygen

BClotting blood

CFighting infections

DProducing hormones

Correct Answer: Fighting infectionsYour Answer: C

Explanation

Therefore option C, Fighting infections, is factually consistent with the stem, the marked correct index, and the explanation.✅ Correct Answer: C — Fighting infections White Blood Cells (WBCs/Leukocytes) are the soldiers of the immune system. Their main function is to protect the body from infections and foreign substances. Carrying oxygen — Oxygen is carried by Red Blood Cells (RBCs) using haemoglobin. WBCs have no role in oxygen transport. Clotting blood — Blood clotting is done by Platelets (Thrombocytes) with clotting factors (fibrinogen, etc.). WBCs don't do clotting. Producing hormones — Hormones are produced by endocrine glands (thyroid, adrenal, pituitary). WBCs don't produce hormones. WBC = Immunity/fighting infections. Platelets = Blood clotting. SSC CGL top blood cell question.

Important Notes

rd is Fighting infections, corresponding to option C. The answer field, correct index, and both explanations must remain aligned.
Read the complete stem and identify the exact demand: organ, gland, hormone, cell, tissue, nutrient, enzyme, pathogen, vector, deficiency disease, body fluid, or physiological function.
Revise every structure with its location and principal function. For example, separate production from storage, transport from exchange, filtration from detoxification, and control from execution.
Learn endocrine facts as source–hormone–target–effect–disorder chains. Common errors arise when students confuse the gland producing a hormone with the organ affected by it.
Learn nutrition facts as nutrient–source–function–deficiency pairs. Vitamins and minerals can have several roles, but SSC questions usually ask the best-known primary association.

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FAQ

SSC CGL Human Body FAQs

Common questions and clear answers for this topic.

Which body systems are most important for SSC CGL preparation?

The digestive, circulatory, nervous, and skeletal systems appear most frequently, along with sensory organs and basic endocrine functions.

How many bones are there in the human body, and is this commonly asked?

Yes, the human body has 206 bones, and questions about the largest, smallest, and total bone count appear fairly often.

What kind of blood-related questions come up in SSC CGL?

Questions usually cover blood group compatibility, the role of platelets in clotting, and basic facts about blood pressure and heart function.

Do I need detailed biochemistry knowledge for the human body section?

No, most questions focus on what each organ does and why, rather than the detailed biochemical processes behind it.

How can I retain human body facts more effectively for the exam?

Linking facts to real-life observations, like why pulse is checked at the wrist, makes them easier to recall than memorizing textbook lines.

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