Biology Multiple Choice Questions on “Body Fluids and Circulation Basics”.
1. Which of the following is the most commonly used body fluid?
a) Blood
b) Plasma
c) Lymph
d) Serum
Answer: a
Clarification: Blood is the most commonly used body fluid by most of the higher organisms including humans for the transportation of essential nutrients to the body tissues. Another body fluid, lymph also helps in the transport of certain substances.
2. Which of the following is absent on blood?
a) Fluid matrix
b) Plasma
c) Fibroblast
d) Formed elements
Answer: c
Clarification: Fibroblast are special cells which are responsible for the formation of fibres in the areolar tissue which is a type of connective tissue. Blood is a special type of connective tissue which consists of a fluid matrix, plasma and formed elements.
3. How much percentage of plasma is present in the blood?
a) 35%
b) 45%
c) 50%
d) 55%
Answer: d
Clarification: Plasma constitutes nearly 55% of the blood. 90-92% of plasma is water and proteins contribute 6-8 per cent of it. Fibrinogens, albumins and globulins are the major proteins.
4. Which of the following are needed for clotting of blood?
a) Fibrinogen
b) Albumin
c) Globulin
d) Magnesium ions
Answer: a
Clarification: Fibrinogens are needed for clotting or coagulation of blood. Globulins primarily are involved in defence mechanisms of the body and the albumins help in the osmotic balance.
5. What is plasma without clotting factors known as?
a) Blood
b) Serum
c) Lymph
d) Fluid
Answer: b
Clarification: Plasma without the clotting factors is known as serum. Factors for coagulation or clotting of blood are also present in the plasma in an inactive form.
6. Which of the following is not a formed element?
a) Erythrocytes
b) Leucocytes
c) Platelets
d) Lymph
Answer: d
Clarification: Erythrocytes, leucocytes and platelets are collectively called as formed elements. They constitute nearly 45% of the blood. A reduction in these number can lead to numerous disorders.
7. RBCs are formed in the thymus.
a) True
b) False
Answer: b
Clarification: RBCs are formed in the red bone marrow in the adults. RBCs are devoid of the nucleus in most of the mammals and are biconcave in shape. They have a red coloured iron-containing pigment called haemoglobin.
8. What is the average life span of RBCs?
a) 120 seconds
b) 120 hours
c) 120 days
d) 120 weeks
Answer: c
Clarification: RBCs have an average life span of about 120 days after which they are destroyed in the spleen which is also known as the graveyard of RBCs. These molecules play a significant role in the transport of gases.
9. What is the colour of leucocytes?
a) White
b) Black
c) Red
d) Colourless
Answer: d
Clarification: Leucocytes which are also known as white blood cells because they are colourless in nature as they lack haemoglobin. They are nucleated and are relatively lesser in number as compared to RBCs.
10. WBCs are characterised into 4 main categories.
a) True
b) False