Blood and Blood Group Questions in English

(D) Vitamin $K$ is essential for the process of blood clotting (coagulation).
It acts as a cofactor for the enzyme $\gamma$-glutamyl carboxylase, which is responsible for the carboxylation of certain glutamate residues in proteins such as prothrombin (Factor $II$), Factor $VII$, Factor $IX$, and Factor $X$.
Without Vitamin $K$, these clotting factors cannot bind calcium ions effectively, leading to impaired blood coagulation.

(A) The salt concentration in human blood is maintained at approximately $0.9\%$.
This means there is $0.9\, gm$ of salt (primarily $NaCl$) per $100\, ml$ of blood plasma.
This concentration is isotonic to human red blood cells,which is why $0.9\%\, NaCl$ solution is used as a physiological saline solution in medical practices.

(A) In humans,mature erythrocytes (Red Blood Cells) are enucleated,meaning they lack a nucleus. This adaptation allows more space for hemoglobin,which is essential for efficient oxygen transport. Neutrophils,lymphocytes,and monocytes are types of leukocytes (White Blood Cells) and all possess a nucleus.

(C) The blood clotting process (coagulation) is a complex cascade involving various clotting factors.
$Calcium$ ions $(Ca^{2+})$ play a crucial role as a cofactor in several steps of the coagulation cascade,particularly in the conversion of prothrombin to thrombin and the activation of various clotting factors.
Without adequate levels of $Calcium$,the blood clotting mechanism is significantly impaired.

(A) Blood plasma contains various inorganic ions. The major ions present in the blood are $Na^+$,$K^+$,$Mg^{2+}$,$Ca^{2+}$,$Cl^-$,$HCO_3^-$,and $SO_4^{2-}$. Among the given options,$Sodium$ $(Na^+)$ is a major cation found in the extracellular fluid and blood plasma. While $Potassium$ and $Chlorine$ are also present,$Sodium$ is the most abundant extracellular cation.

(A) Sodium $(Na^+)$ and potassium $(K^+)$ ions play a crucial role in maintaining the osmotic pressure of extracellular fluids.
$Na^+$ is primarily found in the extracellular fluid,where it helps regulate the osmotic balance and water retention.
$K^+$ is primarily found in the intracellular fluid.
Together,they are essential for nerve impulse transmission and muscle contraction,but their primary role in maintaining osmotic pressure is specifically associated with the extracellular environment for $Na^+$.

(A) Hemoglobin is a complex protein found in red blood cells that is responsible for transporting oxygen throughout the body.
It consists of a protein part called globin and a non-protein prosthetic group called heme.
The heme group contains an iron ion in the ferrous state $(Fe^{2+})$ at its center,which is crucial for binding oxygen molecules.
Therefore,iron $(Fe^{2+})$ is the essential ion required for the synthesis of hemoglobin.

(B) Blood acts as a primary transport medium in the human body. Due to its high specific heat capacity and continuous circulation through the circulatory system,it effectively distributes heat generated by metabolic processes to all parts of the body,thereby maintaining a constant body temperature (homeostasis).

(A) Immunoglobulins,also known as antibodies,are specialized proteins produced by plasma cells (a type of white blood cell).
These proteins are secreted into the blood plasma,which is the liquid component of blood.
Therefore,immunoglobulins are found in the plasma fraction of the blood,where they circulate to identify and neutralize pathogens.

(B) The immune proteins present in the blood are known as $Immunoglobulins$ (also called antibodies).
These are specialized proteins produced by plasma cells (a type of white blood cell) in response to the presence of antigens.
$Globulins$ are a group of proteins in the blood,but $Immunoglobulins$ specifically function in the immune system.
$Albumin$ is primarily involved in maintaining osmotic pressure,and $Fibrinogen$ is involved in blood clotting.

(C) Blood plasma contains several types of proteins,including albumin,globulins (such as immunoglobulins),and fibrinogen.
$A$. Myosin is a contractile protein found in muscle fibers.
$B$. Auxin is a plant growth hormone,not a protein found in human blood plasma.
$C$. Immunoglobulins (antibodies) are specialized proteins present in blood plasma that play a crucial role in the immune system.
$D$. Melanin is a pigment found in the skin,hair,and eyes,not a plasma protein.
Therefore,the correct option is $C$.

(C) The presence of large,immature,and nucleated erythrocytes (megaloblasts) indicates a deficiency in $DNA$ synthesis required for $RBC$ maturation.
Folic acid (Vitamin $B_9$) and Cobalamine (Vitamin $B_{12}$) are essential cofactors for $DNA$ synthesis and the maturation of $RBCs$ in the bone marrow.
$A$ deficiency in these vitamins leads to megaloblastic anaemia,where $RBCs$ fail to mature properly and remain large and nucleated.
Therefore,supplementing the diet with Folic acid and Cobalamine is the correct treatment to alleviate these symptoms.

(D) : Thrombocytes are also known as blood platelets. They are minute,disc-shaped cell fragments found in mammalian blood. They are formed as fragments of larger cells called megakaryocytes in the red bone marrow and lack a nucleus. They play a crucial role in blood clotting by releasing substances like thromboxane $A_2$,serotonin,and other clotting factors. These chemicals initiate a chain of events that form a plug at the site of injury,preventing excessive blood loss. $A$ significant reduction in their number leads to clotting disorders,resulting in excessive bleeding from the body.

(C) $Serum$ is the fluid that remains after blood has clotted.
When blood is allowed to clot, the clotting factors, such as $fibrinogen$, are consumed in the process of forming the clot.
Therefore, $serum$ is essentially blood plasma from which the clotting factors have been removed.
Thus, the correct answer is $C$.

(B) $Erythropoiesis$ is the process of formation of red blood cells $(erythrocytes)$ which occurs in the red bone marrow in adults.
$Proerythroblast$ is the earliest precursor cell which gives rise successively to the early $erythroblast$,intermediate $erythroblast$,and late $erythroblast$.
Then,the nucleus is extruded and a biconcave,enucleated cell called $reticulocyte$ is formed,which is released into the blood.
In the blood,it matures into functional $erythrocytes$.

(B) The correct option is $B$.
$1$. Blood is a connective tissue consisting of a fluid matrix,plasma,and formed elements ($RBCs$,$WBCs$,and platelets).
$2$. Lymph is a fluid that lacks $RBCs$ and platelets; it is essentially plasma with $WBCs$ (lymphocytes).
$3$. Plasma is the straw-colored fluid matrix of blood,obtained after removing all cellular components ($RBCs$,$WBCs$,and platelets).
$4$. Serum is the fluid remaining after blood has clotted,which means it is plasma minus the clotting factors (like fibrinogen).

(A) Individuals with blood group $AB$ possess both antigen $A$ and antigen $B$ on the surface of their $RBC$s.
They do not have any anti-$A$ or anti-$B$ antibodies in their plasma.
Because they lack these antibodies,their immune system does not attack the $RBC$s of donors with blood groups $A, B, AB,$ or $O$.
Therefore,they are known as universal recipients.

(A) The image shows a Basophil,which is a type of granulocyte.
Basophils are the least abundant WBCs $(0.5-1.0\%)$.
They contain large,coarse granules that stain with basic dyes like methylene blue.
Their nucleus is typically lobed (often $S$-shaped or two-lobed,though sometimes appearing multi-lobed due to dense granules).
They secrete chemicals like histamine,serotonin,and heparin,which are involved in inflammatory responses.

(C) The correct answer is $C$. The blood group of the donor was $O$.
Individuals with blood group $O$ are considered universal donors.
This is because their red blood cells lack both $A$ and $B$ antigens on their surface.
Consequently,when $O$ type blood is transfused into a patient of any other blood group ($A, B, AB,$ or $O$),it does not trigger an immune response or cause agglutination (clumping) of the recipient's blood cells.

(C) : The $Spleen$ is a vertebrate organ located behind the stomach, primarily composed of lymphoid tissue.
Its functions include the production of lymphocytes and the destruction of foreign particles.
It acts as a reservoir for $RBCs$ and helps regulate their number in circulation.
Furthermore, it is the primary site for the breakdown of worn-out $RBCs$, which is why it is commonly referred to as the "graveyard" of $RBCs$.

(D) $Fibrinogen$ is a plasma protein that plays a crucial role in the coagulation of blood.
When an injury occurs, $Fibrinogen$ is converted into insoluble $Fibrin$ threads by the enzyme $Thrombin$.
These $Fibrin$ threads form a network that traps blood cells to form a clot, thereby preventing excessive blood loss.
$Albumin$ is primarily involved in maintaining osmotic pressure, while $Globulins$ are mainly involved in defense mechanisms of the body.

(C) The correct answer is $C$. The blood group of the donor is $O$.
Individuals with blood group $O$ are known as universal donors.
This is because their red blood cells lack both $A$ and $B$ antigens on their surface.
Consequently,when $O$ type blood is transfused into a recipient of any other blood group ($A, B, AB,$ or $O$),it does not trigger an immune reaction or agglutination (clumping) of the recipient's blood cells.

(D) In a normal healthy human adult,the average haemoglobin concentration in the blood ranges from $12$ to $16 \ g$ per $100 \ ml$ of blood. Haemoglobin is a red pigment present in red blood cells $(RBCs)$ that plays a crucial role in the transport of respiratory gases,specifically oxygen,throughout the body. Therefore,the correct option is $D$.

(A) The correct answer is $A$. Mature mammalian $RBCs$ (red blood cells) are enucleated,meaning they lack a nucleus and consequently do not contain $DNA$. In contrast,mature spermatozoa contain $DNA$ in their head region,hair roots contain cells with nuclei and $DNA$,and an enucleated ovum (though lacking a nucleus) is not a standard biological cell type found in normal physiological conditions,but the question specifically targets the absence of $DNA$ in mature $RBCs$ as a primary biological characteristic.

(D) : Globulins in human blood plasma are primarily involved in the defence mechanisms of the body.
Globulins,specifically immunoglobulins,act as antibodies that identify and neutralize pathogens such as bacteria,viruses,and other foreign toxic substances that enter the bloodstream.

(B) : Phagocytes are cells that are able to engulf and break down foreign particles,cell debris,and disease-producing microorganisms.
Neutrophils and monocytes are the most active phagocytic white blood cells in the human body.
Neutrophils are the most abundant and act as the first line of defense,while monocytes differentiate into macrophages to perform phagocytosis.

(D) : Basophils are a type of white blood cell that contains coarse granules in their cytoplasm. These granules take up basic stains and are responsible for the secretion of substances such as histamine,serotonin,and the natural anticoagulant heparin,which plays a crucial role in inflammatory responses.

(A) : Blood serum is blood plasma from which the fibrinogen and other clotting factors have been removed.
Since clotting factors are essential for the coagulation process,their absence prevents blood serum from clotting.
In contrast,whole blood,lymph (which contains clotting factors),and blood plasma (which contains fibrinogen) all have the potential to coagulate under appropriate conditions.

(C) The $ABO$ blood grouping system is based on the presence or absence of two surface antigens, $A$ and $B$, on the surface of red blood cells $(RBCs)$.
Individuals with blood group $A$ have antigen $A$ on their $RBCs$.
Individuals with blood group $B$ have antigen $B$ on their $RBCs$.
Individuals with blood group $AB$ have both antigens $A$ and $B$ on their $RBCs$.
Individuals with blood group $O$ have neither antigen $A$ nor antigen $B$ on their $RBCs$. The term "$O$" is derived from the German word "ohne," which means "without," indicating the absence of these specific antigens.

(A) The mother has blood group $B$,which means her genotype can be $I^B I^B$ or $I^B i$.
The child has blood group $AB$,meaning the genotype is $I^A I^B$.
Since the child must inherit one allele from each parent,the child must have received the $I^A$ allele from the father.
If the mother is $I^B I^B$ or $I^B i$,she contributes the $I^B$ allele to the child.
Therefore,the father must possess the $I^A$ allele to pass it to the child.
Possible genotypes for the father that contain the $I^A$ allele are $I^A I^A$,$I^A i$ (Blood group $A$),or $I^A I^B$ (Blood group $AB$).
Thus,the father can have blood group $A$ or $AB$.

(A) Lymphocytes are a type of white blood cell $(WBCs)$ or leukocytes that play a crucial role in the immune system.
They are primarily responsible for the adaptive immune response,which includes the production of antibodies ($B$-lymphocytes) and the destruction of infected or abnormal cells ($T$-lymphocytes).
Unlike red blood cells,which transport oxygen,or platelets,which aid in blood clotting,lymphocytes are specialized for immune defense.

(D) White blood cells $(WBCs)$ are classified into granulocytes and agranulocytes.
Among the granulocytes,Neutrophils are the most abundant cells,constituting about $60-65\%$ of the total $WBCs$.
Lymphocytes constitute about $20-25\%$,Monocytes $6-8\%$,Eosinophils (Acidophils) $2-3\%$,and Basophils are the least abundant,constituting $0.5-1\%$.
Therefore,Neutrophils are present in the highest amount.

(C) Mature mammalian red blood cells $(RBCs)$ lack mitochondria and other organelles.
Because aerobic respiration (the Krebs cycle and electron transport chain) occurs within the mitochondria,$RBCs$ are unable to perform aerobic metabolism of glucose to carbon dioxide.
Instead,they rely exclusively on anaerobic glycolysis to produce $ATP$ for their energy requirements.

(C) Albumins,globulins,and fibrinogen are the major plasma proteins found in human blood.
Plasma is a straw-coloured,viscous fluid constituting nearly $55\%$ of the blood.
These proteins contribute approximately $6-8\%$ of the plasma by weight.
Albumins are primarily involved in osmotic balance,globulins are involved in defense mechanisms (immune response),and fibrinogen is essential for blood clotting.
Therefore,option $C$ is the correct statement.

(D) $1$. $X$ $(RBC)$: Red blood cells lack a nucleus $(R)$ and are present in a count of $5-5.5$ million per $mm^3$ $(A)$. Thus,$X-R-A$.
$2$. $Y$ (Monocytes): Monocytes are nucleated $(P)$ and constitute $6-8\%$ of total white blood cells $(C)$. Thus,$Y-P-C$.
$3$. $Z$ (Eosinophil): Eosinophils are a type of granulocyte $(Q)$ and constitute $2-3\%$ of total white blood cells $(B)$. Thus,$Z-Q-B$.
Therefore,the correct matching is $X-R-A, Y-P-C, Z-Q-B$.

(B) Thrombin is a serine protease enzyme that plays a crucial role in the blood coagulation process.
It is formed from its inactive precursor,prothrombin,by the action of the enzyme complex prothrombinase.
Chemically,thrombin is a protein (specifically an enzyme) that converts soluble fibrinogen into insoluble fibrin strands,which form the meshwork of a blood clot.

(D) Blood plasma contains various proteins,including albumin,globulins,and fibrinogen.
$1$. Albumin is primarily involved in maintaining osmotic balance.
$2$. Globulins are mainly involved in defense mechanisms of the body.
$3$. Fibrinogen is a clotting factor produced by the liver that is essential for the coagulation of blood. When an injury occurs,fibrinogen is converted into insoluble fibrin threads,which form the meshwork of a blood clot.
Therefore,the correct option is $D$.

(A) The white blood cells $(WBCs)$ are classified into granulocytes and agranulocytes.
Granulocytes include neutrophils,eosinophils,and basophils.
Neutrophils are the most abundant ($60-65$ percent) of the total $WBCs$.
Eosinophils constitute about $2-3$ percent of the total $WBCs$ and are involved in resisting infections and allergic reactions.
Basophils are the least abundant ($0.5-1$ percent) of the total $WBCs$.
Therefore,the correct option is $A$.

(C) Basophils are a type of white blood cell (leukocyte) that play a significant role in the body's immune response.
They are involved in inflammatory reactions.
Basophils contain granules that release substances such as heparin (an anticoagulant),histamine (a vasodilator),and serotonin.
Therefore,the correct option is $C$.

(D) Erythroblastosis foetalis is a condition that occurs when there is an $Rh$ incompatibility between a pregnant mother and her foetus.
If an $Rh$-negative mother carries an $Rh$-positive foetus,the mother's immune system may produce anti-$Rh$ antibodies upon exposure to the foetal blood during the first delivery.
In subsequent pregnancies,these anti-$Rh$ antibodies can cross the placenta and destroy the foetal red blood cells (haemolysis).
This destruction leads to severe anaemia and jaundice in the developing foetus or newborn,a condition known as erythroblastosis foetalis.

(C) Plasma is a straw-colored,viscous fluid constituting the matrix of the blood.
It consists of approximately $90-92\%$ water and $6-8\%$ proteins.
Therefore,the correct percentage of water in plasma is $92\%$.

(B) The correct matching is as follows:
$(1)$ Neutrophils are the most abundant phagocytic cells that destroy foreign organisms.
$(2)$ Eosinophils are associated with allergic reactions and resist infections.
$(3)$ Basophils are involved in inflammatory reactions and release histamine,serotonin,and heparin.
$(4)$ Monocytes constitute $6-8\%$ of the total white blood cells and are phagocytic in nature.
Therefore,the correct sequence is $(1-c), (2-d), (3-a), (4-b)$.

(A) Blood clotting (coagulation) is a process that prevents excessive blood loss from the body. Platelets (thrombocytes) are cell fragments that play a crucial role in the clotting mechanism by releasing substances that trigger the formation of a fibrin clot. When the number of platelets decreases significantly,a condition known as thrombocytopenia occurs. This reduction in platelets impairs the blood's ability to clot effectively,leading to clotting disorders and excessive bleeding. Therefore,the correct reason for clotting disorders is the reduction in the number of platelets.

(A) During the process of blood coagulation,an enzyme complex called thrombokinase helps in the formation of an enzyme called thrombin from inactive prothrombin present in the plasma.
Thrombin,in turn,catalyzes the conversion of inactive fibrinogen present in the plasma into insoluble fibrin threads.
These fibrin threads form a network of threads on which dead and damaged formed elements of blood are trapped,leading to the formation of a blood clot.

(B) $WBC$s (White Blood Cells) or leucocytes are nucleated cells,meaning they possess a nucleus. Option $B$ states that they lack a nucleus,which is incorrect. $WBC$s are colourless due to the absence of haemoglobin. They are broadly classified into two categories: granulocytes (neutrophils,eosinophils,basophils) and agranulocytes (lymphocytes,monocytes). Therefore,the statement 'They lack nucleus and are less in number' is false.

(D) Human blood plasma contains three major types of proteins: $Albumins$,$Globulins$,and $Fibrinogens$.
$1$. $Albumins$ are primarily responsible for maintaining the osmotic balance of body fluids.
$2$. $Globulins$ are primarily involved in the defense mechanisms of the body,as they include immunoglobulins (antibodies) that protect against pathogens.
$3$. $Fibrinogens$ are essential for the clotting or coagulation of blood.
Therefore,the correct option is $D$.

(C) In the $ABO$ blood grouping system,individuals with blood group $A$ have $A$ antigens on the surface of their red blood cells and anti-$B$ antibodies in their plasma.
Therefore,they can receive blood from individuals who do not have $B$ antigens,which are those with blood group $A$ (same type) or blood group $O$ (universal donor,as it lacks both $A$ and $B$ antigens).
Thus,a person with blood group $A$ can receive blood from $A$ or $O$ donors.

(B) Phagocytosis is a process by which cells engulf and digest cellular debris,foreign substances,and pathogens.
Among the white blood cells,$Neutrophils$ and $Monocytes$ are the primary phagocytic cells in the blood.
$Macrophages$ are mature monocytes that have migrated into tissues and are also highly phagocytic.
$Basophils$ are involved in inflammatory reactions and the release of histamine,serotonin,and heparin,but they are not primarily phagocytic.
$Acidophils$ (Eosinophils) are involved in allergic reactions and parasitic infections.
$Lymphocytes$ are involved in the immune response ($B$ and $T$ cells) and are not phagocytic.
Therefore,the correct group of phagocytic cells is $Neutrophil$,$Monocyte$,and $Macrophage$.

(D) Plasma is a straw-coloured,viscous fluid constituting the matrix of the blood.
It makes up about $55 \%$ of the blood.
Plasma contains $90-92 \%$ water and $6-8 \%$ proteins (such as fibrinogen,globulins,and albumins).
Statement $(i)$ in the original question was incorrect as it stated $90-92 \%$ protein instead of water.
Statement $(ii)$ in the original question was incorrect as it stated $55 \%$ water instead of protein.
Statement $(iii)$ is correct.
Therefore,only statement $(iii)$ is true.

(B) Blood clotting (coagulation) is a complex process involving a cascade of enzymatic reactions.
Calcium ions $(Ca^{2+})$ play a critical role in this process.
They act as essential cofactors for several clotting factors,including the conversion of prothrombin to thrombin and the activation of various factors in the coagulation cascade.
Therefore,$Ca^{2+}$ is the essential ion for blood clotting.