RBSE Solutions Class 10 Science Chapter 4 Immunity and Blood Groups

I. Multiple Choice Questions

Question 1. Cells which are used in immunity are not present in which of the following?
(a) Bone marrow
(b) Liver
(c) Stomach
(d) Lymph node
Answer: (c) Stomach
In simple words: Immune cells are found in many places like bone marrow and lymph nodes, but they are not typically present in the stomach. The stomach's main job is digestion, not immunity.

🎯 Exam Tip: Remember the primary functions of different organs to quickly identify where immune cells would or wouldn't be found.

Question 2. Plasma cell is a transformed form of which of the following?
(a) B-lymphocyte
(b) T-lymphocyte
(c) Neutrophil
(d) Both 'a' and 'c'
Answer: (a) B-lymphocyte
In simple words: B-lymphocytes are a type of white blood cell that can change into plasma cells. Plasma cells are important because they make antibodies to fight off sickness.

🎯 Exam Tip: Know the different types of white blood cells and their roles in the immune system, especially their transformation states.

Question 3. Antigenic determinants are present in which of the following?
(a) Antigen
(b) IgG antibody
(c) 1gM antibody
(d) Plasma cells
Answer: (a) Antigen
In simple words: Antigenic determinants are specific parts on the surface of an antigen. These parts are like unique flags that antibodies recognize and bind to, triggering an immune response.

🎯 Exam Tip: Understand that antigens are substances that cause an immune response, and antigenic determinants are the specific sites on antigens that antibodies target.

Question 5. Which antibody is present in mother's milk?
(a) IgG
(b) 1gM
(c) IgD
(d) IgA
Answer: (d) IgA
In simple words: IgA is a special type of antibody found in mother's milk. It helps protect babies from infections, especially in their gut, by giving them immunity from their mother.

🎯 Exam Tip: Remember that IgA is crucial for passive immunity transferred from mother to child through breast milk, providing important protection for newborns.

Question 6. Which of the following cells are not present in blood?
(a) Red Blood Cells
(b) White Blood Cells
(c) B-lymphocytes
(d) Submucous cells
Answer: (d) Submucous cells
In simple words: Submucous cells are found in the layers beneath the mucous membranes in organs like the intestines. They are not normally found floating in the bloodstream like red blood cells or white blood cells.

🎯 Exam Tip: Distinguish between cells that circulate in the blood and cells that form part of tissue structures in specific organs.

Question 7. Which of the following proposed blood groups?
(a) Louis Pasteur
(b) Carl Landsteiner
(c) Robert Coach
(d) Edward Jenner
Answer: (b) Carl Landsteiner
In simple words: Carl Landsteiner was the scientist who first found and described the different blood groups, which was a very important discovery for safe blood transfusions.

🎯 Exam Tip: Associate key scientific discoveries with the scientists who made them, especially in historical context for biology.

Question 8. Which is universal donor?
(a) A
(b) B
(c) AB
(d) O
Answer: (d) O
In simple words: People with O blood group are called universal donors because their red blood cells do not have A or B antigens. This means their blood can be given to anyone without causing a strong immune reaction from the recipient.

🎯 Exam Tip: Understand the concept of universal donor (O blood group) and universal recipient (AB blood group) based on the presence or absence of A and B antigens and antibodies.

Question 9. What is the main cause of Erythroblastosis foetalis?
(a) Blood transfusion in child
(b) Rh incompatibility
(c) ABO incompatibility
(d) Both 'a' and 'c'
Answer: (b) Rh incompatibility
In simple words: Erythroblastosis foetalis happens mainly when a mother who is Rh-negative carries an Rh-positive baby. The mother's body can create antibodies that attack the baby's red blood cells, causing serious health issues for the baby.

🎯 Exam Tip: Focus on Rh incompatibility as the primary cause of erythroblastosis foetalis, understanding the roles of the mother's and baby's Rh factors.

Question 10. Which of the following is used in autogenic transfusion?
(a) Self blood from the person
(h) Blood from a different person
(c) Blood from a sheep
(d) Both 'a' and 'b'
Answer: (a) Self blood from the person
In simple words: Autogenic transfusion means a person receives their own blood. This often involves collecting and storing a patient's blood before a planned surgery, then transfusing it back to them if needed during the operation.

🎯 Exam Tip: Differentiate between autogenic (self) and allogenic (other person) transfusions, noting the benefits of using one's own blood.

Question 11. Which of the following diseases is not a result of carelessness during blood transfusion?
(a) Hepatitis B
(b) Malaria
(c) Hemolysis
(d) Creutzfeldt Jakob Disease
Answer: (b) Malaria
In simple words: While Hepatitis B, hemolysis, and Creutzfeldt-Jakob disease can be spread through careless blood transfusions, malaria is usually spread by mosquito bites, not directly by blood transfusion unless specific parasites are present. However, careful screening aims to prevent even that.

🎯 Exam Tip: Understand the various risks associated with blood transfusions and which diseases are typically screened for or are not directly linked to the procedure.

Question 12. Which of the following blood groups is the result of homozygous recessive gene interaction?
(a) A blood group
Answer: [Answer not provided in source]
In simple words: [Explanation not provided in source]

🎯 Exam Tip: [Exam Tip not provided in source]

Question 13. Which of the following is not among the uses of inheritance of blood groups?
(a) Treatment of haemophilia
(b) Treatment of malaria
(c) Treatment of Dengue
(d) Both 'b' and 'c'
Answer: (d) Both (b) and (c)
In simple words: The way blood groups are passed down from parents helps understand family relationships and blood transfusions. However, it does not help in treating diseases like malaria or dengue, which are caused by infections and not related to blood group inheritance.

🎯 Exam Tip: Differentiate between the applications of blood group inheritance (e.g., paternity, forensic science) and the treatment of infectious diseases.

Question 14. Which day is celebrated as Organ Donation Day in India?
(a) 13 September
(b) 13 August
(c) 13 May
(d) 13 June
Answer: (b) 13 August
In simple words: In India, Organ Donation Day is celebrated every year on August 13th. This day helps to raise awareness about how important organ donation is for saving lives.

🎯 Exam Tip: Be aware of important national and international health awareness days, such as Organ Donation Day, for general knowledge and social awareness questions.

Question 15. What is the number of persons (per 10 lakh) to donate organs in India?
(a) 0.1
(b) 2.0
(c) 0.8
(d) 1.8
Answer: (c) 0.8
In simple words: In India, for every ten lakh people, only about 0.8 people donate their organs. This number is quite low compared to other countries. Organ donation helps save many lives by providing needed organs to patients.

🎯 Exam Tip: Keep up-to-date with statistics related to public health and social issues like organ donation, as they reflect important societal trends.

Immunity And Blood Groups Very Short Answer Type Questions

Question 16. How many types of immunity are found in humans?
Answer: Humans have two main types of immunity: innate immunity and acquired immunity. Innate immunity is present from birth, while acquired immunity develops over time. It helps protect the body from various diseases.
In simple words: Humans have two types of immunity: innate (what we are born with) and acquired (what we get over time).

🎯 Exam Tip: Clearly state the two types of immunity and briefly explain the difference between them.

Question 18. What should be the molecular weight of antigen?
Answer: For a substance to act as an effective antigen and trigger an immune response, its molecular weight should generally be more than 6000 Daltons. Smaller molecules might not be strong enough to cause a reaction on their own. This helps the body differentiate between harmless and harmful substances.
In simple words: Antigens usually need to have a molecular weight higher than 6000 Daltons to be recognized by the immune system.

🎯 Exam Tip: Remember the approximate molecular weight threshold for a substance to be considered antigenic, as this is a specific biological detail.

Question 19. Antibodies are which type of protein?
Answer: Antibodies are a type of protein known as gamma globulin. These special proteins are produced by the immune system to identify and fight off foreign invaders like bacteria and viruses. They are also known as immunoglobulins.
In simple words: Antibodies are a kind of protein called gamma globulin.

🎯 Exam Tip: Use the term "gamma globulin" or "immunoglobulin" when describing the protein nature of antibodies for accuracy.

Question 20. Which antibody can even cross placenta to reach embryo?
Answer: The IgG antibody is unique because it can cross the placenta from a mother to her unborn baby. This transfer provides passive immunity to the baby, protecting it from infections even before birth. This is an important way mothers pass on protection.
In simple words: The IgG antibody is the only one that can go from the mother to the baby through the placenta.

🎯 Exam Tip: Identify IgG as the antibody responsible for passive immunity in newborns due to its ability to cross the placental barrier.

Question 21. Which antibody is present on mast cells?
Answer: The IgE antibody is present on the surface of mast cells. When IgE antibodies on mast cells bind to allergens, they trigger the release of chemicals like histamine, which causes allergic reactions. This is why IgE is often linked to allergies.
In simple words: IgE antibodies are found on mast cells and are involved in allergic reactions.

🎯 Exam Tip: Link IgE with allergic reactions and its presence on mast cells, as this is a key role of this antibody.

Question 22. Which cells in blood facilitate exchange of gases?
Answer: Red Blood Cells (RBCs) are the cells in blood that facilitate the exchange of gases. They contain a protein called hemoglobin, which binds to oxygen in the lungs and releases it in the tissues, and also helps carry carbon dioxide back to the lungs. This process is essential for breathing.
In simple words: Red Blood Cells (RBCs) help blood carry oxygen and carbon dioxide, which is how gases are exchanged.

🎯 Exam Tip: Clearly state RBCs as the primary cells for gas exchange and mention hemoglobin as the key component.

Question 23. Which scientist proposed grouping of blood?
Answer: Carl Landsteiner was the scientist who proposed the grouping of blood. His work in identifying the ABO blood group system was a groundbreaking discovery that made safe blood transfusions possible. This contribution earned him the Nobel Prize.
In simple words: Carl Landsteiner was the scientist who first identified and grouped human blood types.

🎯 Exam Tip: Accurately name Carl Landsteiner as the discoverer of blood groups, a fundamental concept in immunology and transfusion medicine.

Question 24. Which blood group is the universal donor?
Answer: The O blood group is considered the universal donor. This is because red blood cells from Group O individuals do not have A or B antigens on their surface. Therefore, they are not recognized as foreign by recipients with other blood types, making them compatible for transfusion to most people. They are essential in emergency situations.
In simple words: Blood group O is the universal donor because it can be given to people of all blood types.

🎯 Exam Tip: Reiterate the 'universal donor' status of O blood group and its immunological basis (absence of A and B antigens).

Question 25. Which blood group has both 'A' and 'B' antigens?
Answer: The AB blood group has both 'A' and 'B' antigens on the surface of its red blood cells. Because it has both antigens, individuals with AB blood group do not produce A or B antibodies, allowing them to accept blood from all other blood types, making them universal recipients. This makes it a unique blood type.
In simple words: The AB blood group has both A and B antigens.

🎯 Exam Tip: Understand that the presence of both A and B antigens defines the AB blood group, leading to its status as the universal recipient.

Question 26. What percentage of world population has Rh positive blood?
Answer: Approximately 85% of the world's population has Rh positive blood. The Rh factor is another important antigen on red blood cells, and its presence or absence determines whether a person is Rh positive or Rh negative. This majority percentage means most people can receive Rh positive blood safely.
In simple words: About 85% of people in the world have Rh positive blood.

🎯 Exam Tip: Remember the approximate percentage of the global population with Rh-positive blood, as it's a common factual detail in immunology.

Question 27. Which Rh factor is the most important?
Answer: The Rh D factor is considered the most important Rh factor. It is the primary antigen that causes strong immune responses, leading to complications like erythroblastosis foetalis if an Rh-negative mother carries an Rh-positive baby. Doctors specifically test for this factor in blood transfusions and pregnancies.
In simple words: The Rh D factor is the most crucial Rh factor due to its strong immune response.

🎯 Exam Tip: Identify Rh D as the clinically most significant Rh factor, especially in the context of pregnancy and blood transfusions.

Question 28. Who conducted the first blood transfusion?
Answer: The first blood transfusion was conducted by a French doctor named Jean-Baptiste Denis in 1667. He performed this historical procedure using lamb's blood on a human. While his early attempts faced challenges, his work marked a significant step in the history of medicine.
In simple words: Jean-Baptiste Denis, a French doctor, performed the first blood transfusion in 1667.

🎯 Exam Tip: Know the historical figures and key dates related to important medical breakthroughs like the first blood transfusion.

Question 29. What is autogenic transfusion?
Answer: Autogenic transfusion is a medical procedure where a person's own blood is collected and stored before a planned surgery, and then given back to them if needed during or after the operation. This method avoids the risks associated with receiving blood from another donor, such as allergic reactions or transmission of diseases. It is a very safe option.
In simple words: Autogenic transfusion is when a patient receives their own blood that was collected earlier.

🎯 Exam Tip: Define autogenic transfusion clearly and highlight its main advantage: using the patient's own blood eliminates donor-related risks.

Question 30. Write the names of alleles which control blood groups?
Answer: The alleles that control blood groups are \( I^A \), \( I^B \), and \( i \). The \( I^A \) allele is responsible for the A antigen, and the \( I^B \) allele for the B antigen. The \( i \) allele is recessive and does not produce any antigen. Different combinations of these three alleles determine a person's ABO blood type. These genes are located on chromosome 9.
In simple words: The alleles that decide blood groups are \( I^A \), \( I^B \), and \( i \).

🎯 Exam Tip: List the three alleles correctly and understand their role in producing (or not producing) A and B antigens, which define the ABO blood groups.

Question 31. Organ Donation Day in celebrated on which date in India?
Answer: In India, Organ Donation Day is celebrated annually on August 13. This day is dedicated to raising public awareness about the importance of organ donation and encouraging people to pledge their organs to save lives. It is a crucial initiative for health.
In simple words: Organ Donation Day in India is celebrated on August 13th each year.

🎯 Exam Tip: Remember the specific date for Organ Donation Day in India to answer factual questions accurately.

Immunity And Blood Groups Short Answer Type Questions

Question 33. Define antibody.
Answer: An antibody is a protective protein produced by B-lymphocytes (a type of white blood cell) in response to the presence of an antigen. These proteins are designed to specifically recognize and bind to the antigen, helping the body to neutralize or eliminate it. Antibodies play a critical role in the adaptive immune response.
In simple words: An antibody is a protein made by the body to fight off specific foreign substances called antigens.

🎯 Exam Tip: Define antibody clearly, mentioning its production by B-lymphocytes and its specific interaction with antigens.

Question 34. What are antigenic determinants?
Answer: Antigenic determinants, also known as epitopes, are the specific small regions on the surface of an antigen molecule that are recognized and bound by an antibody or a T-cell receptor. The entire antigen molecule does not interact with an antibody; only these specific parts do. These unique sites are crucial for initiating an immune response.
In simple words: Antigenic determinants (or epitopes) are the specific parts of an antigen that antibodies recognize and attach to.

🎯 Exam Tip: Emphasize that epitopes are the *specific* binding sites on antigens, not the entire antigen molecule.

Question 35. What is the role of hinge in antibody?
Answer: In most antibodies, the "hinge region" refers to flexible areas where the two arms of the Y-shaped antibody molecule connect to the main body. This flexibility is very important because it allows the antibody arms to move and bend, making it easier for them to bind to antigens that might be spaced differently. This movement helps antibodies effectively capture and neutralize foreign invaders.
In simple words: The hinge region in an antibody gives its arms flexibility, helping it to bind better to antigens.

🎯 Exam Tip: Explain the hinge region's location and its functional importance for antigen binding flexibility.

Question 36. What is blood?
Answer: Blood is a vital fluid tissue composed of plasma and various blood cells, including red blood cells, white blood cells, and platelets. It serves multiple essential functions in the body, such as transporting substances like oxygen, nutrients, hormones, and waste products. Blood also plays a crucial role in immunity by carrying immune cells and antibodies, helps maintain body temperature, and regulates water balance. It is continuously circulated throughout the body.
In simple words: Blood is a fluid tissue made of plasma and blood cells that carries important things around the body, fights sickness, and helps control body temperature.

🎯 Exam Tip: When defining blood, mention its composition (plasma, cells) and its key functions (transport, immunity, regulation).

Question 37. Explain ABO blood grouping.
Answer: ABO blood grouping divides blood into four main types: A, B, AB, and O. This classification is based on the presence or absence of specific antigens (A and B) on the surface of red blood cells. Blood group A has A antigens, blood group B has B antigens, blood group AB has both A and B antigens, while blood group O has neither. There are three alleles responsible for ABO grouping: \( I^A \), \( I^B \), and \( i \). Antigens on RBCs are formed by these genes. The allele ' \( i \)' is recessive and does not participate in forming any antigen. The interaction of these alleles determines a person's specific blood group, which is crucial for safe blood transfusions.
In simple words: ABO blood grouping sorts blood into types A, B, AB, or O based on special markers (antigens A and B) on red blood cells. These markers are controlled by genes, and their combinations decide your blood type.

🎯 Exam Tip: Describe ABO grouping by linking each blood type to its specific antigens and explain the genetic basis using the \( I^A \), \( I^B \), and \( i \) alleles.

Question 39. What is blood transfusion? Explain.
Answer: Blood transfusion is a medical procedure that involves transferring blood or blood components from one person (the donor) into another person's (the recipient's) circulatory system. This process is vital for saving lives in various situations, such as after severe accidents with excessive bleeding, for patients suffering from conditions like haemophilia, or during major surgeries. The first recorded blood transfusion was performed by French doctor Jean-Baptiste Denis in 1667, highlighting its long history in medicine. Blood transfusion helps replenish lost blood and supports various bodily functions.
In simple words: Blood transfusion is a medical process where blood from one person is given to another, often to save lives after injuries, during surgery, or for certain illnesses.

🎯 Exam Tip: Define blood transfusion clearly, mention its purpose, give examples of situations where it's needed, and briefly refer to its historical context.

Question 40. Write need to be taken during blood transfusion.
Answer: To ensure a safe blood transfusion, several precautions must be taken. First, the blood groups of both the donor and recipient must be accurately matched to prevent severe reactions. Second, Rh factor matching is also essential to avoid complications. Third, the donor's blood must be thoroughly screened for the presence of any infections, such as hepatitis or HIV, to ensure it is safe. Finally, all donated blood must be collected in sterilized containers to prevent contamination. These steps are critical for patient safety.
In simple words: During blood transfusions, it's very important to match blood types, check Rh factors, screen for infections, and use clean containers to keep patients safe.

🎯 Exam Tip: List the key precautions for blood transfusion (matching, Rh factor, infection screening, sterility) as a step-by-step process for a complete answer.

Question 41. Explain the need for organ donation.
Answer: Organ donation is crucial because it saves many lives. There is a significant imbalance between the number of organs needed for transplant and the number available, leading to a huge demand-supply gap. Many patients with organ failure could live longer and healthier lives if they received a donated organ. Sadly, many people die waiting for a suitable donor. Compared to the world's average, India has a lower rate of organ donation, with only about 0.8 persons per ten lakh donating organs. Increasing awareness and participation in organ donation can drastically improve these statistics and offer hope to those in need. It provides a second chance at life.
In simple words: Organ donation is vital because many patients need organs to live, but there aren't enough available. Donating organs can save lives and help close this big gap between demand and supply.

🎯 Exam Tip: Highlight the demand-supply gap in organ donation and emphasize its life-saving potential, mentioning the importance of public awareness.

Immunity And Blood Groups Long Answer Type Questions

Question 43. Explain the structure of antibodies?
Answer: An antibody is a Y-shaped protein composed of four structural units: two identical heavy (H) chains and two identical light (L) chains. The heavy chain is longer and bigger, while the light chain is shorter and smaller. Each heavy chain consists of about 440 amino acids, and each light chain has about 220 amino acids. A heavy chain and a light chain together form an HL dimer. All these chains are held together by disulfide bonds, which are strong chemical links. The heavy and light chains in each half of the antibody are also joined by disulfide bonds. This complex structure allows the antibody to perform its function efficiently. Each heavy and lighter chain is divided into two parts:
(a) Variable Portion: This part is located towards the \( NH_2 \) end of the chain and is responsible for reacting directly with the antigen. It is also called the Fab portion. This region is highly diverse, allowing antibodies to recognize a vast array of antigens.
(b) Constant Portion: This part is towards the \( COOH \) end of the chain and is called the Fc portion. The constant portion determines the antibody's class and its effector functions. Most Y-shaped antibodies have flexible "hinge" regions where the arms connect to the stem, which allows the variable portions to move and react effectively with antigen molecules. This flexibility is key to their function.
In simple words: An antibody looks like a 'Y' and is made of four protein chains: two heavy and two light chains, held together by strong bonds. The tips of the 'Y' (variable part) grab onto specific invaders (antigens), while the base (constant part) decides what kind of antibody it is and what it does.

🎯 Exam Tip: Describe the Y-shaped structure, distinguishing between heavy and light chains, and detail the variable (Fab) and constant (Fc) regions, explaining their respective roles in antigen binding and effector functions.

Question 45. Explain the process of blood transfusion.
Answer: Blood transfusion is a procedure that involves transferring blood or blood components from a donor to a recipient's bloodstream. The process consists of two main stages: blood collection and blood transfusion.
A. Blood Collection:
• First, the donor undergoes a thorough health checkup to ensure they are healthy enough to donate and to prevent transmission of diseases.
• Blood is collected using a cannula into a sterilized pouch that contains anticoagulants to prevent clotting.
• After collection, the donated blood is stored at a low temperature to preserve it.
• Crucially, the collected blood is screened for any infections like Hepatitis, HIV, and also tested for ABO grouping and Rh factor to ensure safety and compatibility.
B. Blood Transfusion:
• The donor's blood type and Rh factor must be carefully matched with the recipient's to avoid adverse reactions. This ensures the recipient's immune system does not attack the donated blood.
• Stored blood is taken out of the refrigerator approximately 30 minutes before the actual transfusion to allow it to warm slightly.
• The blood is then transfused intravenously into the recipient, a process that typically takes about 4 hours.
• Throughout the transfusion, the recipient is continuously monitored for any unexpected reactions, ensuring their safety.
In simple words: Blood transfusion involves collecting blood safely from a donor, checking it thoroughly for health and type, and then carefully giving it to a patient. This process requires matching blood groups and monitoring the patient to make sure it is safe.

🎯 Exam Tip: Break down the blood transfusion process into logical steps, from donor screening and blood collection to matching, warming, and recipient monitoring, to ensure a comprehensive answer.

Question 46. What is organ donation? Explain its significance.
Answer: Organ donation is the process of surgically removing an organ or tissue from one person (the donor) and placing it into another person (the recipient) whose organ has failed. This act is profoundly significant as it can save the lives of patients suffering from end-stage organ failure or vastly improve their quality of life. Organs can be donated by live donors (e.g., a kidney, part of the liver, bone marrow) or by deceased donors (e.g., heart, lungs, kidneys, liver, pancreas).
Significance of Organ Donation:
• Many patients are in urgent need of organ transplants to survive or regain health.
• Thousands of people unfortunately die each year due to a severe shortage of suitable donor organs.
• Organs from many brain-dead patients, which could save lives, often remain unused due to lack of awareness or proper systems.
• There is a general lack of public awareness about the importance and process of organ donation, which hinders participation.
• The huge gap between the demand for organs and their supply sometimes contributes to illegal organ trafficking, underscoring the critical need for legitimate donations. Organ donation offers a second chance at life for many individuals.
In simple words: Organ donation means giving organs or tissues from one person to another to save their life or improve health. It is very important because many people need organs to live, but there are not enough available, and awareness about donation is still low.

🎯 Exam Tip: Define organ donation and elaborate on its significance by discussing the demand-supply gap, the life-saving potential, and the impact of awareness on increasing donations.

Question 47. Explain the importance of inheritance of blood groups.
Answer: The inheritance of blood groups is very important and has several practical uses. One significant application is in settling disputes related to the parentage of a child. By analyzing the blood groups of the child and the alleged parents, it can be determined if a child could or could not be biologically related. For example, if a child's blood group is B, and the first couple has blood groups O and AB, while the second couple has A and B, genetic diagrams can show which couple could potentially have a child with blood group B. This genetic information helps clarify biological relationships. Blood group inheritance is also critical for understanding compatibility in blood transfusions and for addressing certain genetic conditions like haemophilia. It plays a role in forensic science as well.
In simple words: Understanding how blood groups are inherited is important for figuring out who a child's biological parents are and for safely matching blood types for transfusions.

🎯 Exam Tip: Focus on the primary importance of blood group inheritance in paternity testing and medical compatibility, illustrating with a simple example if possible.

I. Multiple Choice Questions

Question 1. An antibody is made up of which of the following?
(a) Protein
(b) Carbohydrate
(c) Lipid
(d) Vitamins
Answer: (a) Protein
In simple words: Antibodies are essentially proteins that the body uses to fight off infections.

🎯 Exam Tip: Remember that antibodies are protein molecules, specifically gamma globulins, produced by the immune system.

Question 2. An antigen is composed of which of the following?
(a) Protein
(b) Polysaccharide
(c) Lipid
(d) Any of these
Answer: (d) Any of these
In simple words: Antigens can be made of different types of molecules like proteins, sugars, or fats. It's the unique shape of these molecules that the immune system recognizes.

🎯 Exam Tip: Note that antigens can be diverse in their chemical composition, including proteins, polysaccharides, and lipids, all capable of triggering an immune response.

Question 3. Antigenic determinant is a chain of how many amino acids?
(a) 2-4
(b) 4-6
(c) 6-8
(d) More than 10
Answer: (c) 6-8
In simple words: The tiny part of an antigen that an antibody recognizes, called an antigenic determinant, is usually made up of a short chain of 6 to 8 amino acids.

🎯 Exam Tip: Recall the typical length of an antigenic determinant (epitope) in terms of amino acids for precise answers.

Question 4. What is antigenic valency in most of the bacteria?
(a) 10
(b) 50
(c) 70
(d) More than 100
Answer: (d) More than 100
In simple words: Antigenic valency refers to how many places an antibody can attach to an antigen. For most bacteria, there are many spots, often more than 100, where antibodies can bind.

🎯 Exam Tip: Understand that antigenic valency indicates the number of available binding sites for antibodies on an antigen, and for bacteria, this number can be very high.

Question 6. How many types of antigen are present on surface of RBCs?
(a) One
(b) Two
(c) Three
(d) Four
Answer: (b) Two
In simple words: On the surface of red blood cells, there are typically two main types of antigens that determine your ABO blood group: A and B. These are crucial for blood matching.

🎯 Exam Tip: Remember that for ABO blood grouping, the two primary antigens (A and B) determine the blood type, and their presence or absence is key.

Question 7. Rh factor was first discovered in which mammal?
(a) Human
(b) Tiger
(c) Monkey
(d) Dog
Answer: (c) Monkey
In simple words: The Rh factor was first found in Rhesus monkeys, which is how it got its name. Later, it was discovered that humans also have this factor.

🎯 Exam Tip: Recall that the Rh factor was named after the Rhesus monkey, where it was initially identified.

Question 8. Which blood group is universal acceptor?
(a) A
(b) B
(c) AB
(d) O
Answer: (c) AB
In simple words: People with AB blood group are called universal acceptors because their red blood cells have both A and B antigens, and their plasma does not contain anti-A or anti-B antibodies. This means they can safely receive blood from any ABO blood type.

🎯 Exam Tip: Distinguish between universal donor (O blood group) and universal acceptor (AB blood group) by understanding the antigens and antibodies present in each.

Immunity and Blood Groups Very Short Answer Type Questions

Question 1. Define immunity.
Answer: Immunity is how our body fights off diseases. It acts as our natural defense system that helps keep us healthy and protected from sickness.
In simple words: Immunity is our body's power to fight off sickness.

🎯 Exam Tip: When defining biological terms, always include the core function and a brief explanation of its role in the body.

Question 2. What is immunology?
Answer: Immunology is the scientific study of the immune system. This field explores how the body recognizes and fights against infections, germs, and diseases. It helps us understand how our body protects itself.
In simple words: Immunology is the science that studies our body's defense system against germs.

🎯 Exam Tip: Remember that immunology focuses on the *system* of immunity, not just the process of fighting disease itself.

Question 4. What is acquired immunity?
Answer: Acquired immunity is a type of protection that your body gets after being exposed to a specific germ or vaccine. It means your body learns to fight that particular invader better over time and remembers how to do so. This learned response is crucial for long-term defense.
In simple words: Acquired immunity is when your body learns to fight a certain germ after meeting it.

🎯 Exam Tip: Distinguish acquired immunity by its "learned" and "specific" nature, unlike the general protection of innate immunity.

Question 5. What is active immunity?
Answer: Active immunity happens when your body makes its own antibodies after fighting a disease or getting a vaccine. This means your body is actively building its defense system to protect itself from future infections. This type of immunity usually lasts a long time.
In simple words: Active immunity means your body makes its own antibodies to fight a specific germ.

🎯 Exam Tip: Active immunity is key for vaccine effectiveness, as it trains your body to produce its own protective antibodies.

Question 6. What is blood transfusion?
Answer: Blood transfusion is a medical process where a person receives blood from someone else (or their own previously stored blood) into their veins. This helps replace lost blood, improve blood components, or treat certain medical conditions. It is a vital life-saving procedure.
In simple words: Blood transfusion is when someone gets blood put into their body from another person.

🎯 Exam Tip: For definitions, always state what the process is and its main purpose. In this case, it's about receiving blood into the circulatory system.

Question 7. What is allogenic transfusion?
Answer: Allogenic transfusion is when a patient receives blood or blood products from a donor who is a different person. This is the most common type of blood transfusion used in hospitals and clinics. It requires careful matching between donor and recipient.
In simple words: Allogenic transfusion uses blood from another person.

🎯 Exam Tip: Remember "allo" means "other" or "different," which helps recall that allogenic transfusion uses blood from another person.

Question 8. What is autogenic transfusion?
Answer: Autogenic transfusion, also known as autologous transfusion, is when a person receives their own blood that was collected and stored earlier. This method is preferred to avoid potential risks and reactions that can come from receiving donor blood. It is a very safe option.
In simple words: Autogenic transfusion means using a person's own blood for transfusion.

🎯 Exam Tip: Remember "auto" means "self," indicating that autogenic transfusion uses one's own blood.

Immunity and Blood Groups Short Answer Type Questions

Question 1. What are the different types of acquired immunity?
Answer: Acquired immunity has two main types:
1. Active Immunity: This happens when your body makes its own antibodies to fight a specific germ. This can occur after you get sick and recover, or after you receive a vaccine. Your body actively learns and remembers how to fight that germ, providing long-lasting protection.
2. Passive Immunity: This occurs when you receive antibodies from an outside source instead of making your own. For example, a baby gets antibodies from its mother through breast milk, or a person receives an injection of antibodies to quickly fight off a disease. This provides immediate but temporary protection.
These two types represent different ways the body gains specific defense capabilities.
In simple words: Acquired immunity is either active (your body makes antibodies) or passive (your body gets antibodies from somewhere else).

🎯 Exam Tip: Remember that active immunity provides long-lasting protection because your body has 'learned' to fight, while passive immunity offers immediate but temporary protection.

Question 2. Write a short note on antigen.
Answer: An antigen is a substance, often a germ or a foreign material, that enters the body. It causes the immune system, specifically B-lymphocytes, to make special proteins called antibodies. Antigens usually have a molecular weight greater than 6000 Daltons. Sometimes, the body can also produce its own antigens, like during a viral infection or in cancer cells, triggering an immune response.
In simple words: An antigen is anything that makes your body's defense system create antibodies to fight it.

🎯 Exam Tip: Focus on antigens as "antibody generators" – foreign substances that provoke an immune response.

Question 3. What do you understand by valency of antigen?
Answer: The valency of an antigen refers to the number of specific sites on its surface that can bind to antibodies. These binding sites are called antigenic determinants, or epitopes, and they are typically made of 6 to 8 amino acids. A single protein can have many such determinants, and some bacteria can have an antigenic valency of 100 or even higher, allowing many antibodies to attach.
In simple words: Antigen valency means how many places on an antigen can connect with antibodies.

🎯 Exam Tip: Visualize antigenic valency as the number of "hooks" an antigen has for antibodies; more hooks mean it can bind to more antibodies.

Question 4. Which are the steps of destruction of antigen?
Answer: The body destroys antigens in a few key steps:
(a) First, the immune system tells the difference between antigens that come from outside the body and those made inside the body. This is a critical initial recognition.
(b) Then, B-lymphocyte cells turn into plasma cells. These plasma cells are made to match the specific shape of the antigenic determinant present on the external antigen.
(c) These plasma cells then create specific antibodies that are designed to target that particular antigen.
(d) Finally, the antibodies either directly react with the antigen to destroy it through an antigen-antibody reaction, or cell-mediated immunity (CMI) cells remove the antigen.
In simple words: Antigens are destroyed by our body first telling them apart, then making special cells and antibodies to fight them, and finally removing them.

🎯 Exam Tip: When listing steps, ensure they are in logical order and briefly explain what happens in each phase of antigen destruction.

Question 5. Write a short note on antibody.
Answer: An antibody is a Y-shaped protein produced by the immune system to identify and neutralize foreign objects like bacteria and viruses. Antibodies recognize specific parts of these invaders, called antigens. The specific part of the antibody that binds to an antigen is called a paratope. Antibodies play a vital role in protecting the body from infections by marking pathogens for destruction.
In simple words: Antibodies are special proteins that find and stick to germs in your body to help fight them off. The part of the antibody that connects to the germ is called a paratope.

🎯 Exam Tip: Describe antibodies as "Y-shaped proteins" and mention their key function: "identifying and neutralizing foreign invaders."

Question 6. Briefly explain Rh incompatibility in blood transfusion.
Answer: Rh incompatibility in blood transfusion happens when a person with Rh-negative blood receives Rh-positive blood. The Rh-negative recipient's immune system recognizes the Rh factor on the transfused blood as foreign and creates IgG antibodies. These antibodies then attack and destroy the transfused red blood cells, a process called agglutination. This destruction leads to higher levels of bilirubin in the blood, which harms the liver and spleen, potentially causing kidney failure and even death if not managed.
In simple words: Rh incompatibility happens when Rh-negative blood gets Rh-positive blood, causing the body to attack the new blood, which can be very dangerous.

🎯 Exam Tip: Highlight that Rh incompatibility is an immune response triggered by the mixing of Rh-positive and Rh-negative blood types, leading to RBC destruction.

Question 7. Write some cases when a person may need blood transfusion.
Answer: A person might need a blood transfusion in several critical situations:
• If they have lost a lot of blood due to an accident or severe bleeding.
• When their body has a serious overall shortage of blood.
• During major surgeries, to replace blood lost during the operation.
• If they have a low count of platelets, which are essential for blood clotting.
• Patients with hemophilia, a genetic condition where blood doesn't clot properly.
• Individuals suffering from sickle cell anemia, a severe blood disorder.
Transfusions are crucial for supporting these medical conditions by providing necessary blood components.
In simple words: People need blood transfusions after big accidents, surgeries, or if they have diseases like hemophilia or sickle cell anemia that affect their blood.

🎯 Exam Tip: List a variety of scenarios for blood transfusions, categorizing them by acute loss, chronic conditions, and specific blood disorders.

Immunity and Blood Groups Long Answer Type Questions

Question 1. Explain innate immunity.
Answer: Innate immunity is the natural defense system we are born with. This type of immunity is also called general or natural immunity because it does not provide any special protection against a specific germ. Instead, it works against all antigens in the same way, acting as the body's first line of defense.
Some important factors that help innate immunity function include:
1. Cellular Barriers: Many special cells, such as macrophages and neutrophils, actively consume and destroy invading germs. These cells are like the body's clean-up crew, constantly patrolling for threats.
2. Inflammation: This process, which includes symptoms like redness, swelling, and increased temperature (fever), also helps fight off germs. The higher temperature during fever can kill many types of microbes, making the body a hostile environment for them.
Innate immunity provides a rapid, non-specific response to pathogens.
In simple words: Innate immunity is the defense system we are born with. It uses special cells and body reactions like fever to fight all germs generally, not just specific ones.

🎯 Exam Tip: When explaining innate immunity, emphasize its "inborn," "non-specific," and "first-line defense" characteristics, providing examples of its mechanisms.

Question 2. Explain acquired immunity.
Answer: Acquired immunity is a defense system that the body develops after it has been exposed to a specific germ or pathogen. It learns to create a specific antibody to target that particular antigen. Once the body "learns," it remembers the germ and can fight it more effectively if it encounters it again. This process also starts cell-mediated immunity.
Acquired immunity has two main types:
1. Active Immunity: This occurs when the body actively produces its own antibodies in response to an antigen, either from an infection or a vaccine. This type of immunity lasts a long time because the body creates memory cells.
2. Passive Immunity: This happens when antibodies are given to the body from an outside source. The body does not make these antibodies itself. Examples include antibodies passed from a mother to her baby (natural passive immunity) or injections of antibodies (artificial passive immunity), such as for tetanus. This provides quick, but temporary, protection.
These two types represent different ways the body gains specific defense capabilities against various threats.
In simple words: Acquired immunity is when your body learns to fight specific germs over time. It can be active (your body makes antibodies) or passive (your body gets antibodies from elsewhere).

🎯 Exam Tip: Differentiate between active and passive acquired immunity by focusing on whether the body *makes* its own antibodies (active) or *receives* them from an external source (passive).

Question 3. With the help of a table, show different types of antibody and their characteristics.
Answer:

In simple words: Antibodies are different types of proteins, like IgG, IgM, and IgD. Each type has a specific job in our body's defense, such as crossing into a baby, being the first to appear, or telling other defense cells to start working.

🎯 Exam Tip: When describing antibodies, remember their key features: structure (e.g., pentameric), location (e.g., serum, placenta), and primary function (e.g., activating B cells, first response).