Question

The blood material that fights infection, destroy foreign material, and develop a defense system in the body are

• A. RBCs
• B. WBCs
• C. Platelets
• D. All cells

Answer 1

The correct option is B

WBCs

The correct option is B.

Explanation of correct option:

Blood has various blood cells and plasma in it. Each type of blood cell has its own role in the body of an organism. The three blood cells present in the blood are white blood cells, red blood cells, and platelets. White blood cells are also called Leukocytes.

• White blood cells are part of the defense system or immune system.
• It helps in killing the infection causing foreign bodies such as bacteria, viruses, and fungi.
• These cells produce proteins called antibodies that provide defense against infections.

Explanation of Incorrect options:

Option A:

• RBCs or red blood cells carry oxygen and nutrients in the animal body but do not play part in the immune system.

Option C:

• Platelets are the blood cells that help in preventing excessive blood loss from the injury site by clotting blood.

Option D:

• Since options A and C are incorrect, option D is invalid.

The blood material that fights infection destroys foreign material and develops a defense system in the body are WBCs.