Biology

Human Immunity and Blood

2,096 Questions

Human immunity and blood questions cover the physiological mechanisms protecting the body against diseases and the components of blood. Topics include blood groups, cell mediated immunity, monoclonal antibodies, and blood coagulation. These biology topics frequently appear in general science sections of competitive exams.

Blood groupsCell mediated immunityMonoclonal antibodiesBlood coagulationCancer immunology

Human Immunity and Blood Questions

Multiple choice

Which of the following statements is not true about blood plasma?

  1. It is faint yellow in colour.

  2. It is composed of corpuscles.

  3. It cannot coagulate.

  4. It is the fluid part of blood.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Blood consists of a fluid medium known as plasma, which contains salts, enzymes and different proteins. It is faint yellow in colour. Blood also consists of corpuscles like red blood cells (RBC’s), white blood cells (WBC’s) and platelets. But blood plasma itself is not composed of corpuscles. So, option (2) is incorrect.

Multiple choice

Match the following ||||| |---|---|---|---| |1.|Lymphocytes|a.|have red pigment| |2.|Erythrocytes|b.|produce megakaryocytes| |3.|Platelets|c.|are secreted by basophil| |4.|Histamine|d.|are of two types, B and T |

  1. 1 - c, 2 - b, 3 - d, 4 - a

  2. 1 - b, 2 - c, 3 - a, 4 - d

  3. 1 - b, 2 - d, 3 - c, 4 - a

  4. 1 - d, 2 - a, 3 - b, 4 - c

  5. 1 - a, 2 - c, 3 - d, 4 - b
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, it is correct as all are matched correctly. Erythrocytes have red coloured pigment. It is because of the presence of iron. Platelets are formed by megakaryocytes present in bone marrow. Basophils secrete histamine, serotonin, heparin. etc. Lymphocytes are of two types; 'B' and 'T'. No, it is incorrect. Here, 1 and 4 are matched incorrectly. The correct match is 1 - d, 2 - a, 3 - b, 4 - c.

Multiple choice

A person with blood group ‘A’ can donate blood to the persons with blood group ‘A’ or ‘AB’ because it

  1. has both ‘A’ and ‘B’ antigens

  2. has only ‘A’ antigen and ‘b’ antibodies

  3. has only ‘B’ antigen and ‘a’ antibodies

  4. does not have any antigens and antibodies
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A person with blood group ‘A’ can donate blood to persons with blood group A or ‘AB’ because it has only ‘A’ antigen and ‘b’ antibodies.

Multiple choice

If there are no antibodies in plasma, and antigens on RBCs are A and B, and the blood group of the person is AB, then which of the following can be the donor group?

(a) A (b) B (c) O (d) AB

  1. Only (a)

  2. Only (b)

  3. Only (c)

  4. Any of the above

  5. Cannot be determined
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, it is the correct answer as the donor group can be any one of the above blood groups. AB blood group is universal recipient and a person with blood group AB can receive blood from any blood group. No, it is incorrect.

Multiple choice

Match the following:

 
a. Plasma B - cells 1. They produce more B-lymphocyte cells.
b. Memory B - cells 2. They secrete antibodies into the blood circulation.
c. Dividing B - cells 3. They do not produce antibodies, but become programmed to remember a specific antigen and
respond very rapidly to any subsequent infection.

  1. a - 2, b - 1, c - 3

  2. a - 3, b - 2, c - 1

  3. a - 1, b - 2, c - 3

  4. a - 1, b - 3, c - 2

  5. a - 2, b - 3, c - 1
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option.  This is a wrong option. 

Multiple choice

The fluid part of the blood is called

  1. plasma

  2. platelets

  3. lymph

  4. RBC
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blood is a fluid flowing in blood vessels. It has its several components. Its several components are plasma, red blood cells, white blood cells and the platelets. The fluid part of the blood is known as plasma. Blood is red in colour due to the presence of a pigment called haemoglobin.

Multiple choice

Which process helps in the healing of wounds?

  1. Erythropoiesis

  2. Blood clotting

  3. Haemolysis

  4. Agglutination
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If there is any cut or wound, the platelets of blood reach the surface and plug in the wound by clotting blood at that place. Therefore, platelets help in the healing of wounds by blood clotting.

Multiple choice

Lymph differs from the blood as it has

  1. more WBC's and few RBC's

  2. only WBC's and no RBC's

  3. more RBC's and few WBC's

  4. only RBC's and no WBC's
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lymph is a pale fluid made up of only WBCs and not RBCs. So, option 2 is correct.

Multiple choice

The universal acceptor blood group is

  1. A Group

  2. B Group

  3. AB Group

  4. O Group
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

AB blood group is called the universal acceptor because individuals with AB blood have both A and B antigens on their red blood cells but no anti-A or anti-B antibodies in their plasma. This means they can receive blood from any group (A, B, AB, or O) without having an adverse reaction.

Multiple choice

Total No. of Blood Groups in the human body are

  1. Two

  2. Three

  3. Four

  4. Five
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ABO blood group system classifies human blood into four main types: A, B, AB, and O. These groups are determined by the presence or absence of A and B antigens on red blood cells. This is the primary and most well-known blood classification system used worldwide.