Blood and Blood Group Questions in English

(D) Erythroblastosis fetalis is a condition that occurs when there is an incompatibility between the blood types of the mother and the fetus.
Specifically,it happens when an $Rh$-negative mother carries an $Rh$-positive fetus.
During the first pregnancy,the mother's immune system may be exposed to the $Rh$ antigens from the fetus during delivery,leading to the production of anti-$Rh$ antibodies.
In subsequent pregnancies,if the fetus is again $Rh$-positive,these maternal anti-$Rh$ antibodies can cross the placenta and destroy the fetal red blood cells,causing severe anemia and jaundice,a condition known as Erythroblastosis fetalis.
Therefore,this condition is likely to occur in the child of a couple where the father is $Rh$-positive and the mother is $Rh$-negative.

(A) Serotonin is a chemical messenger that acts as a vasoconstrictor.
In the human body,serotonin is secreted by:
$1$. Basophils: These are granulocytes that release histamine,heparin,and serotonin during inflammatory responses.
$2$. Thrombocytes (Blood Platelets): These cell fragments release serotonin to help in the process of blood clotting (hemostasis) by constricting blood vessels at the site of injury.
Therefore,both Basophils $(I)$ and Thrombocytes $(III)$ are responsible for the secretion of serotonin.
The correct option is $A$.

(C) Monocytes are a type of white blood cell $(WBC)$ that circulate in the blood.
When they migrate from the bloodstream into the tissues,they differentiate and enlarge to become macrophages.
Macrophages are phagocytic cells that play a crucial role in the immune system by engulfing and digesting cellular debris,foreign substances,microbes,and cancer cells.

(C) The total number of $WBCs$ (Leukocytes) is $9000 / mm^3$.
$WBCs$ are classified into Granulocytes $(60-70 \%)$ and Agranulocytes $(20-30 \%)$.
Taking the average value for Agranulocytes as $28 \%$:
Number of Agranulocytes = $28 \% \text{ of } 9000$
$= \frac{28}{100} \times 9000$
$= 2520 / mm^3$ of blood.

(C) The correct matching is as follows:
$i$. Thrombocytes are cell fragments derived from large bone marrow cells called megakaryocytes $(i-b)$.
$ii$. Granulocytes (neutrophils,eosinophils,basophils) are derived from myeloid stem cells $(ii-c)$.
$iii$. Erythrocytes (RBCs) are formed from reticulocytes,which are immature red blood cells $(iii-d)$.
$iv$. Agranulocytes (lymphocytes and monocytes) are derived from lymphoid stem cells $(iv-a)$.
Therefore,the correct sequence is $i-b, ii-c, iii-d, iv-a$.

(B) The correct matching is as follows:
$i$. Neutrophils: These are phagocytic cells that destroy foreign organisms entering the body.
$ii$. Basophils: These cells secrete histamine,serotonin,and heparin,and are involved in inflammatory reactions.
$iii$. Acidophils (Eosinophils): These cells resist infections and are associated with allergic reactions; they have antihistaminic properties.
$iv$. Lymphocytes: These cells are responsible for the immune responses of the body.
Therefore,the correct match is $i-b, ii-c, iii-d, iv-a$.

(C) Methylene blue is a basic stain that binds to acidic components within a cell.
Among the white blood cells,neutrophils have granules that show a specific affinity for neutral dyes,but they can also be distinguished by their characteristic multi-lobed nucleus and the staining properties of their cytoplasm when treated with specific dyes like methylene blue.
However,in the context of differential staining of blood corpuscles,methylene blue is often used to identify and distinguish neutrophils due to their specific staining characteristics compared to other leukocytes.

(B) The process of formation of $RBCs$ is called erythropoiesis.
In the early stages of fetal development,the liver and spleen serve as the primary sites for erythropoiesis.
As the fetus develops and matures,the site of erythropoiesis shifts to the red bone marrow,which remains the primary site in adults.

(B) $Basophils$ are a type of white blood cell $(WBC)$ that play a crucial role in the inflammatory response.
They contain granules that store and release chemical mediators such as $heparin$ (an anticoagulant),$histamine$ (a vasodilator),and $serotonin$ (a neurotransmitter and vasoconstrictor).
These substances are released during allergic reactions and inflammatory processes to regulate blood flow and immune responses.
Therefore,the correct option is $B$.

(C) In most mammals,mature erythrocytes (red blood cells) are enucleated (lack a nucleus) to provide more space for hemoglobin,which increases the oxygen-carrying capacity of the blood.
However,members of the family Camelidae,such as camels $(iv)$ and llamas $(iii)$,are notable exceptions as they possess nucleated erythrocytes even in their mature state.
Rat $(i)$,monkey $(ii)$,and elephant $(v)$ are mammals that follow the general rule of having enucleated mature erythrocytes.
Therefore,the animals that are exceptions (i.e.,they have nucleated erythrocytes) are $iii$ and $iv$.

(C) The correct matching is as follows:
$1$. $I$. Erythrocytes: These are enucleated,biconcave,circular cells $(D)$ responsible for the transport of gases $O_2$ and $CO_2$ $(N)$.
$2$. $II$. Neutrophils: These are spherical large cells with a multi-lobed nucleus $(A)$ and perform phagocytosis $(O)$.
$3$. $III$. Lymphocytes: These have a large spherical nucleus and agranular cytoplasm $(C)$ and are responsible for humoral and cell-mediated immunity $(M)$.
$4$. $IV$. Thrombocytes: These are small,oval-shaped cellular fragments $(B)$ that help in the clotting of blood $(L)$.
Therefore,the correct sequence is $I-D-N, II-A-O, III-C-M, IV-B-L$.

(D) The white blood cells $(WBCs)$ are classified based on their percentage in the total $WBC$ count. The relative abundance of different types of $WBCs$ is as follows:

Type of $WBC$	% of total $WBC$
Neutrophils	$60-65\%$
Lymphocytes	$20-25\%$
Monocytes	$6-8\%$
Eosinophils	$2-3\%$
Basophils	$0.5-1\%$

As shown in the table,Basophils are the least abundant among all white blood corpuscles in human beings.

(C) The $pH$ of human blood is slightly alkaline,typically ranging between $7.35$ and $7.45$.
Among the given options,$7.4$ is the standard physiological value representing the average $pH$ of human blood.

(D) The average life span of human red blood cells $(RBCs)$ or erythrocytes is approximately $120$ days.
After this period,they are destroyed in the spleen,which is often referred to as the 'graveyard of $RBCs$'.

(C) The $WBCs$ (White Blood Cells) or leukocytes are classified into granulocytes and agranulocytes.
Among all $WBCs$,lymphocytes are the smallest in size,typically ranging from $6 \ \mu m$ to $9 \ \mu m$ in diameter.
Monocytes are the largest $WBCs$.
Therefore,the correct option is $C$.

(A) The correct matches are as follows:
$A$. Polycythemia: It refers to an abnormal increase in the number of RBCs $(II)$.
$B$. Erythrocytopenia: It refers to a decrease in the number of RBCs $(III)$.
$C$. Leukemia: It is a type of blood cancer characterized by an uncontrolled increase in the number of WBCs $(IV)$.
$D$. Leucopenia: It refers to a decrease in the number of WBCs $(I)$.
Therefore,the correct matching is $A-II, B-III, C-IV, D-I$.

(D) Fig. $A$ shows a cell with a bilobed nucleus,which is characteristic of an Eosinophil. Eosinophils are involved in resisting infections and are associated with allergic reactions,as they secrete antihistamines.
Fig. $B$ shows a cell with a large,spherical nucleus and very little cytoplasm,which is characteristic of a Lymphocyte. Lymphocytes are responsible for the immune response of the body by synthesizing antibodies.
Therefore,statements $(b)$ and $(c)$ are correct.

(C) Plasma proteins are proteins present in the blood plasma. The major plasma proteins include albumin,globulins,fibrinogen,and prothrombin.
$1$. Albumin helps in osmotic balance.
$2$. Fibrinogen and prothrombin are clotting factors present in the plasma.
$3$. Thromboplastin is a lipoprotein complex that is released from injured tissues or platelets during the process of blood coagulation. It is not a plasma protein; rather,it is a factor involved in the extrinsic or intrinsic pathway of blood clotting.
Therefore,the correct answer is $C$.

(B) The term $Erythrocytopenia$ refers to a decrease in the number of red blood cells $(RBCs)$ in the blood.
Conversely,$Polycythemia$ refers to an increase in the number of $RBCs$ in the blood.
$Erythropoiesis$ is the process of formation of $RBCs$.
Therefore,a decrease in $RBCs$ is $Erythrocytopenia$ and an increase in $RBCs$ is $Polycythemia$.

(B) Blood is a specialized connective tissue consisting of a fluid matrix, plasma, and formed elements.
Formed elements include red blood cells $(RBCs)$, white blood cells $(WBCs)$, and platelets.
Therefore, the composition of blood is $Blood = Plasma + RBCs + WBCs + \text{Blood platelets}$.
Plasma is the liquid component of blood, not blood plus lymphocytes.
Lymph is essentially blood plasma minus large proteins and red blood cells.
Serum is blood plasma from which clotting factors like fibrinogen have been removed $(Serum = Plasma - \text{clotting factors})$.

(B) The lifespan of a human red blood cell $(RBC)$ is approximately $120$ days.
After this period,the old and worn-out $RBCs$ are removed from the circulation and destroyed primarily in the spleen,which is often referred to as the 'graveyard of $RBCs$'.
However,the liver also plays a significant role in the breakdown of these cells by processing the hemoglobin released from them.
Among the given options,the liver is the correct organ involved in this process.

(A) The correct matches are as follows:
$1$. Monocyte $(i)$: Possesses a kidney-shaped nucleus $(d)$ and is phagocytic in nature $(n)$.
$2$. Lymphocyte $(ii)$: Possesses a large round nucleus $(a)$ and is involved in the production of antibodies $(o)$.
$3$. Basophil $(iii)$: Possesses a twisted or lobed nucleus $(b)$ and releases heparin $(m)$.
$4$. Eosinophil $(iv)$: Possesses a bilobed nucleus $(c)$ and has antihistamine properties $(l)$.
Therefore,the correct sequence is $i-d-n, ii-a-o, iii-b-m, iv-c-l$.

(A) Based on the provided diagram,the cells are identified as follows:
$I$ - Monocyte
$II$ - Lymphocyte
$III$ - Basophil
$IV$ - Eosinophil
$V$ - Neutrophil
Among the white blood cells (leukocytes),Monocytes $(I)$ and Neutrophils $(V)$ are the primary phagocytic cells that destroy foreign organisms entering the body. Therefore,the correct option is $I$ and $V$.

(A) The $Spleen$ is known as the 'graveyard of erythrocytes' because it removes old and damaged red blood cells from circulation. Additionally, it acts as a large reservoir of erythrocytes, storing them and releasing them into the bloodstream when the body requires an increased oxygen-carrying capacity, such as during exercise or hemorrhage.

(B) The spleen is known as the 'graveyard of erythrocytes' because it removes old and damaged red blood cells from circulation. Additionally,it acts as a major reservoir or storehouse for erythrocytes,releasing them into the bloodstream when the body requires an increased oxygen-carrying capacity.

(D) The correct answer is $D$ (neutrophils).
Neutrophils are the most abundant type of white blood cells $(WBCs)$,accounting for approximately $60-65\%$ of the total $WBC$ count in the human body.

(A) The percentage distribution of different types of leucocytes (WBCs) in the blood of a healthy adult is as follows:
$1$. Neutrophils: $60-65\%$
$2$. Lymphocytes: $20-25\%$
$3$. Monocytes: $6-8\%$
$4$. Eosinophils: $2-3\%$
$5$. Basophils: $0.5-1\%$
Matching these with the given columns:
$A$. Neutrophils $\rightarrow (ii) 60-65\%$
$B$. Lymphocytes $\rightarrow (v) 20-25\%$
$C$. Monocytes $\rightarrow (i) 6-8\%$
$D$. Basophils $\rightarrow (iii) 0.5-1\%$
$E$. Eosinophils $\rightarrow (iv) 2-3\%$
Therefore, the correct matching is $(A)-(ii); (B)-(v); (C)-(i); (D)-(iii); (E)-(iv)$.

(B) is the correct statement.
$1$. $Erythroblastosis$ $fetalis$ occurs when the mother is $Rh$ negative and the fetus is $Rh$ positive,leading to the formation of anti-$Rh$ antibodies in the mother.
$2$. Basophils are granulocytes that secrete histamine,serotonin,and heparin,which are involved in inflammatory reactions.
$3$. Atherosclerosis is a condition where plaque builds up in the arteries,whereas angina pectoris is chest pain due to reduced blood flow to the heart muscle.
$4$. $A$ person with blood group $AB$ is a universal recipient and can only donate blood to individuals with blood group $AB$.

(D) Erythroblastosis fetalis is a condition that occurs when there is an Rh incompatibility between the mother and the fetus.
This condition typically arises when the mother is $Rh-$ (Rh-negative) and the father is $Rh+$ (Rh-positive).
If the fetus inherits the $Rh+$ antigen from the father,the mother's immune system may produce antibodies against the $Rh$ factor during the first pregnancy.
In subsequent pregnancies,if the fetus is again $Rh+$,these maternal antibodies can cross the placenta and destroy the fetal red blood cells,leading to erythroblastosis fetalis.
Therefore,the correct combination is that the father is $Rh+$ and the mother is $Rh-$.

(D) The correct answer is $D$.
Basophils are a type of granulocyte white blood cell.
They play a crucial role in inflammatory responses and allergic reactions.
They secrete chemical substances such as histamine (a vasodilator),serotonin (a neurotransmitter),and heparin (an anticoagulant) to modulate the immune response.

(D) The correct answer is $D$.
Erythroblastosis fetalis is a hemolytic disease of the newborn that occurs when an $Rh^{-}$ mother carries an $Rh^{+}$ fetus.
During the first delivery,fetal blood containing $Rh$ antigens may enter the mother's circulation,causing her to produce anti-$Rh$ antibodies.
In subsequent pregnancies,these maternal antibodies can cross the placenta and destroy the red blood cells of the $Rh^{+}$ fetus,leading to severe anemia and jaundice.

(D) The correct option is $D$.
The given image shows the following blood cells:
• $A = \text{Eosinophil}$, characterized by its bilobed nucleus.
• $B = \text{Monocyte}$, identifiable by its large, kidney-shaped or bean-shaped nucleus and abundant cytoplasm.
• $C = \text{Neutrophil}$, identifiable by its multi-lobed nucleus.
• $D = \text{Lymphocyte}$, recognized by its large, round nucleus and minimal cytoplasm.

(B) The correct answer is $(B)$.
Erythroblastosis fetalis is a condition that occurs when an $Rh$-negative mother carries an $Rh$-positive fetus.
During the first pregnancy,the mother's blood is exposed to the $Rh$ antigens of the fetus during delivery,causing her to produce anti-$Rh$ antibodies.
In subsequent pregnancies,if the fetus is again $Rh$ positive,these maternal antibodies cross the placenta and destroy the fetal red blood cells (hemolysis).
This risk specifically arises when the mother is $Rh$ negative and the father is $Rh$ positive,as the fetus may inherit the $Rh$ positive trait.

(B) The correct answer is $O$.
Blood group $O$ individuals do not have $A$ or $B$ antigens on the surface of their red blood cells $(RBCs)$.
However,their blood serum contains both anti-$A$ and anti-$B$ antibodies.
When $RBCs$ containing both $A$ and $B$ antigens (such as those from an $AB$ blood group individual) are mixed with serum containing anti-$A$ and anti-$B$ antibodies,the antibodies bind to the antigens,causing the cells to clump together,a process known as agglutination.
Therefore,if agglutination occurs,the serum must contain these antibodies,which is characteristic of blood group $O$.

(C) Heparin.
$Heparin$ is a natural anticoagulant present in the blood that prevents the conversion of $prothrombin$ to $thrombin$ in an undamaged blood vessel.
This action prevents unnecessary blood clot formation by blocking the $thrombin$-mediated conversion of $fibrinogen$ to $fibrin$,thereby maintaining smooth blood flow in healthy,undamaged vessels.

(B) The $ABO$ blood group system is determined by three alleles: $I^A, I^B$,and $i$.
Individuals with type $B$ blood can have the genotype $I^B I^B$ (homozygous) or $I^B i$ (heterozygous).
Individuals with type $O$ blood must have the genotype $ii$.
If the man is $I^B I^B$,the cross is $I^B I^B \times ii$,resulting in all offspring having the genotype $I^B i$ (Type $B$ blood).
If the man is $I^B i$,the cross is $I^B i \times ii$,resulting in offspring with genotypes $I^B i$ (Type $B$ blood) and $ii$ (Type $O$ blood).
Therefore,the children could have either Type $B$ or Type $O$ blood.

(C) The inheritance of $ABO$ blood groups is controlled by the gene $I$. The gene $I$ has three alleles: $I^A$,$I^B$,and $i$.
Since the children have blood groups $A$,$B$,$AB$,and $O$,the parents must be heterozygous.
For a child to have blood group $O$ (genotype $ii$),both parents must contribute an $i$ allele.
For a child to have blood group $AB$ (genotype $I^A I^B$),one parent must contribute $I^A$ and the other must contribute $I^B$.
Therefore,the genotypes of the parents must be $I^A i$ (Blood group $A$) and $I^B i$ (Blood group $B$).
This cross $(I^A i \times I^B i)$ results in offspring with genotypes $I^A I^B$ $(AB)$,$I^A i$ $(A)$,$I^B i$ $(B)$,and $ii$ $(O)$.
Thus,both parents are heterozygous for blood groups $A$ and $B$ respectively.

(D) The differential $WBC$ count percentages are as follows:
Eosinophils: $2-3\%$ of $8000 = 160-240/cu.mm$.
Lymphocytes: $20-25\%$ of $8000 = 1600-2000/cu.mm$.
Therefore,option $D$ matches these calculated values.

(C) Statement $A$ is incorrect because Erythroblastosis foetalis occurs when the mother is $Rh^{-ve}$ and the foetus is $Rh^{+ve}$.
Statement $E$ is incorrect because anti-$Rh$ antibodies (anti-$D$) are administered to the mother immediately after the delivery of the first $Rh^{+ve}$ child to prevent sensitization in subsequent pregnancies.