Q. Which of the following is the fluid part of the blood ?

The correct answer is Option B: Plasma.

Explanation: Blood is composed of two main components: the fluid part and the cellular part. The fluid part of the blood is called plasma, which makes up about 55% of the total blood volume. Plasma is a yellowish liquid that primarily consists of water (about 90-92%), along with proteins, electrolytes, nutrients, hormones, and waste products. It serves as the medium for transporting nutrients, hormones, and waste products throughout the body.

The other components mentioned in the options are part of the cellular portion of blood:
– WBC (White Blood Cells): These are responsible for fighting infections and are part of the immune system.
– Blood platelets: These are involved in blood clotting to prevent excessive bleeding.
– RBC (Red Blood Cells): These carry oxygen to the body’s tissues and remove carbon dioxide.

Thus, the fluid part of the blood is plasma.