The component of the blood which helps to fight infections is
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Leukocytes
Leukocytes, the white blood cells, are the body’s defence against infection. Some of them, such as neutrophils and monocytes, swallow and destroy germs, while lymphocytes make antibodies that attack particular germs.
Why the other options are incorrect
Option (1) Erythrocytes — Incorrect. These are the red blood cells, which carry oxygen using their haemoglobin.
Option (2) Plasma — Incorrect. It is the liquid part of blood, which carries dissolved food, salts, hormones and wastes.
Option (3) Platelets — Incorrect. These small cell fragments help the blood to clot at a wound.