NCERT Solutions for Class 12 Biology Chapter 7 Human Health and Disease
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The NCERT Solutions for Class 12 Biology Chapter 7 Human Health and Disease discusses various forms of immunity. It includes innate and acquired immunity and how the immune system fights infections. Common diseases such as bacterial, viral, and fungal, and lifestyle diseases like cancer and drug addiction, are covered. The NCERT Solutions present the topics in a clear and organised way. This makes it easier for students to understand the concepts and score well in exams.
This Story also Contains
- Download Human Health and Disease NCERT Solutions PDF
- Get Class 12 Biology Chapter 7 Human Health and Disease Solutions (Exercise Questions)
- Approach to Solve Human Health and Disease Class 12 Question Answer
- Important Question from Class 12 Biology Chapter 7 Solutions
- What Students Learn from Human Health and Disease NCERT Solutions
- What Extra Should Students Study Beyond the NCERT for NEET?
- NCERT Solutions for Class 12 Biology Chapter-wise
Through the study of the Human Health and Disease Class 12 question answer, students can understand the cause of different diseases and how to protect themselves. This chapter is also important for NEET preparation, as it covers topics that are frequently asked in exams. The NCERT Solutions for Class 12 Biology provide explanations of all the questions in a step-by-step manner. For quick and easy revision, the solutions serve as a perfect resource to strengthen preparation and boost confidence before exams.
Download Human Health and Disease NCERT Solutions PDF
Students can download the PDF of the Human Health and Disease chapter from the link given below. The Class 12 Biology Chapter 7 Human Health and Disease question answer PDF includes answers to all the questions in a well-understandable manner.
Also Read,
Get Class 12 Biology Chapter 7 Human Health and Disease Solutions (Exercise Questions)
The detailed answers to all the questions of this chapter are given below. By going through the Class 12 Biology Chapter 7 Human Health and Disease question answer, which are prepared according to the latest NCERT guidelines, students can gain knowledge about diseases.
Answer:
To avoid infectious diseases, the following public health measures can be implemented:
- Vaccination: Individuals should get vaccinated on time to prevent diseases such as cholera, tuberculosis, and hepatitis.
- Awareness: All should be informed about diseases to safeguard themselves.
- Sanitation: Maintaining the environment clean, consuming clean water, and having hygienic food can prevent diseases.
- Vector Control: The disease-carrying insects and pests must be eradicated by destroying their breeding grounds.
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Download EBookQues 2. In which way has the study of biology helped us to control infectious diseases?
Answer:
The study of biology has contributed greatly to the prevention of diseases in various ways:
- It makes us aware of the cause of diseases.
- It helps in recognising how diseases are transmitted, e.g., if an individual develops diarrhoea, the infection can spread through dirty food or water.
- It helps in discovering medicine for treating infected individuals.
- It helps in the formulation of vaccines for preventing diseases
Ques 3. How does the transmission of each of the following diseases take place?
A) Amoebiasis
Answer:
Amoebiasis - It is transmitted through the consumption of water and food contaminated by amoebic cysts.
B) Malaria
Answer:
Malaria - It is transmitted from one person to another using the female Anopheles mosquito. When a female Anopheles mosquito bites an infected person, it ingests Plasmodium parasites with the blood. When it later bites a healthy person, the parasites are transmitted into their bloodstream.
C) Ascariasis
Answer:
Ascariasis - It is transmitted through food and water contaminated with eggs of the parasite.
D) Pneumonia
Answer:
Pneumonia - It transmits through droplet infection, i.e., through a sneeze, cough, sharing utensils, etc.
Ques 4. What measures would you take to prevent water-borne diseases?
Answer:
Waterborne diseases such as typhoid and cholera are prevented by:
- Proper disposal of sewage and waste.
- Periodic inspection and purification of water sources.
- Drinking only purified and clean water.
Ques 5. Discuss with your teacher what 'a suitable gene' means in the context of DNA vaccines.
Answer:
A suitable gene is a unique segment of DNA that is implanted in the body to make certain proteins. These proteins protect the body against dangerous disease-producing organisms.
Ques 6. Name the primary and secondary lymphoid organs.
Answer:
Lymphoid organs help in making and activating immune cells:
- Primary lymphoid organs: These are the bone marrow and thymus, where immune cells mature.
- Secondary lymphoid organs: These are the spleen, lymph nodes, tonsils, Peyer's patches in the intestine, and the appendix, where immune cells encounter infections.
Ques 7: The following are some well-known abbreviations which have been used in this chapter. Expand well-known abbreviations
a) MALT
Answer:
MALT- Mucosal Associated Lymphoid Tissue
b) CMI
Answer:
CMI - Cell Mediated Immunity
c) AIDSAnswer:
AIDS- Acquired Immune Deficiency Syndrome
d) NACOAnswer:
NACO- National AIDS Control Organisation
e) HIVAnswer:
HIV- Human Immunodeficiency Virus
Ques8: Differentiate the following and give examples of each:
a) Innate and acquired immunity
Answer:
Innate Immunity | Acquired Immunity |
| Present from birth and provides general protection. | Develops when the body is exposed to specific infections. |
| Acts as the first line of defence | Acts as the second line of defence |
| Passed down genetically. | Not inherited from parents. |
Answer:
Active Immunity | Passive Immunity |
| The body produces its antibodies after infection or vaccination. | Antibodies are given from an external source (e.g., injection). |
| Long-lasting protection. | Short-term protection. |
| Takes time to develop. | Works immediately. |
Ques 9. Draw a well-labeled diagram of an antibody molecule.
Answer:
The well-labelled diagram of an antibody molecule is as follows:
Ques 10. What are the various routes by which transmission of the human immunodeficiency virus takes place?
Answer:
HIV is transmitted in various ways:
- By sharing contaminated needles.
- Through unprotected sex with an infected individual.
- From an infected mother to her child during pregnancy.
- Through transfusion of contaminated blood.
Answer:
HIV causes a deficiency of the immune system in the following ways:
- It binds to helper T-cells and injects its genetic material.
- It utilises the machinery of the cell to make more copies of itself.
- The infected T-cells burst, spilling more virus particles.
- With time, the T-cells reduce in number, weakening the body against infections.
Ques 12. How is a cancerous cell different from a normal cell?
Answer:
Differences between cancerous cells and normal cells
Cancerous Cells | Normal Cells |
| Cancerous cells divide uncontrollably and may form tumours. | Normal cells grow and divide in a regulated manner. |
| It can spread to other tissues and organs | Stay in one place and perform normal functions |
Ques 13. Explain what is meant by metastasis.
Answer:
Metastasis is the condition in which cancer cells move from the primary location to other locations of the body through the blood or lymph. It is the terminal stage of cancer.
Ques 14. List the harmful effects caused by alcohol/drug abuse.
Answer:
Drug and alcohol abuse result in:
Ques 15. Do you think that friends can influence one to take alcohol/drugs? If yes, how may one protect himself/herself from such an influence?
Answer:
Yes, peer pressure can result in drug or alcohol consumption. It can be prevented by:
- Avoid individuals who consume drugs or alcohol.
- Developing self-discipline and willpower.
- Learning about the dangerous impacts of addiction.
- Seeking support from parents or teachers.
- Seeking proper medical assistance should depression or emotional distress become present.
Ques16. In your view, what motivates youngsters to turn to alcohol or drugs, and how can this be avoided?
Answer:
Teenagers can begin consuming alcohol or drugs because of:
- Pressure from peers.
- Desire for thrill and curiosity.
- Stress, depression, or emotional issues.
- Media pressure, wherein films and celebrities glorify alcohol and drug consumption.
Prevention is achieved through:
- Speaking to youth about the risks of addiction.
- Open conversations with teachers and parents.
- Healthy stress management.
- Positive role models and activities.
Answer:
After a person begins to take drugs or alcohol, it is hard to quit because:
- The brain becomes habituated to the effects and longs for more.
- With time, the body is unable to function normally without it.
- Withdrawal symptoms such as anxiety, pain, and depression make quitting hard.
- The individual can be socially dependent on alcohol or drugs.
NCERT Solutions for Class 12- Subject-wise
Approach to Solve Human Health and Disease Class 12 Question Answer
Below are a few steps that students can follow to solve the questions from this chapter easily.
Students first need to understand the difference between infectious and non-infectious diseases.
Different diseases like typhoid, pneumonia, malaria, and ascariasis should be studied in detail. Students can create flashcards using the Class 12 Biology Chapter 7 Human Health and Disease question answer.
The next step is to understand the concept of immunity, its types, antibodies, and the immune system. For a detailed explanation, students can use the Class 12 Biology Chapter 7 Human Health and Disease Solutions.
Students can prepare short notes by highlighting the symptoms and effects of different drugs, and how to control drug abuse.
- Practice all types of questions given in the NCERT Solutions for Class 12 to understand the question pattern.
Also, check the NCERT Books and the NCERT Syllabus here:
Important Question from Class 12 Biology Chapter 7 Solutions
The Human Health and Disease chapter helps students understand the causes of diseases and the importance of immunity. Given below is an important question from this chapter. For more such questions, students can refer to the NCERT Solutions for Class 12 Biology Chapter 7 Human Health and Disease. This improves their problem-solving skills and makes them familiar with the question pattern.
Question: Haemozoin is a
A. precursor of haemoglobin
B. The toxin released from Streptococcus-infected cells
C. The toxin released from Plasmodium-infected cells
D. The toxin released from Haemophilus-infected cells
Answer: The correct answer is option (C), he toxin released from Plasmodium-infected cells
Explanation:
A dangerous byproduct generated by the parasite Plasmodium in malaria disease is haemozoin, which is a by-product of the ingestion of haemoglobin by the parasitic red cell.
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CBSE Class 12th Syllabus: Subjects & Chapters
Select your preferred subject to view the chapters
What Students Learn from Human Health and Disease NCERT Solutions
The chapter explains the significance of maintaining health and how various diseases affect living organisms.
Students understand the causes, symptoms, and prevention of common diseases like typhoid, pneumonia, malaria, ascariasis, and filariasis.
Through the Human Health and Disease NCERT Solutions, learners get explanations of the immune system, including innate and acquired immunity, and immunisation.
The chapter highlights serious conditions like AIDS and cancer, explaining their causes, effects, and control measures.
With the help of the Human Health and Disease Class 12 question answer, students learn how drug and alcohol abuse impacts humans and society.
Concepts like allergy, autoimmunity, and immunodeficiency are discussed to make students aware of immune system disorders.
What Extra Should Students Study Beyond the NCERT for NEET?
For better NEET preparation, students can explore some extra topics beyond the NCERT. The table below lists key areas to focus on. Along with this, students can refer to the NCERT Solutions for Class 12 Biology Chapter 7 Human Health and Disease to avoid confusion.
NCERT Solutions for Class 12 Biology Chapter-wise
Below are the Chapter-wise solutions:
Frequently Asked Questions (FAQs)
Q: What are the different types of immunity explained in NCERT Chapter 7?
A:
The chapter Human Health and Disease explains two types of immunity:
- Innate Immunity – Natural immunity from birth.
- Acquired Immunity – Gained over a period of time due to infection or vaccines.
Q: How do vaccines help in disease prevention?
A:
Vaccines are made of weakened or dead disease-causing germs. When they are put into the body, they make the immune system produce antibodies. This makes the body able to recognise and attack the infection in the future.
Q: What are the key topics covered in NCERT Class 12 Biology Chapter 7?
A:
The important topics covered in the NCERT Solutions for Class 12 Biology Chapter 7 Human Health and Disease are different types of diseases, immunity, vaccines, and the role of the immune system in fighting infections. It also discusses AIDS, cancer, drug abuse, and public health measures.
Q: Where can I find NCERT solutions for Class 12 Biology Chapter 7?
Q: How does the immune system fight infections?
A:
The immune system makes white blood cells and antibodies to fight and kill dangerous microorganisms. It also contains memory cells that enable it to recognise and combat the same infection if it re-enters the body.
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The date of 12 exam is depends on which board you belongs to . You should check the exact date of your exam by visiting the official website of your respective board.
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Class 12 biology questions papers 2023-2025 are available on cbseacademic.nic.in , and other educational website. You can download PDFs of questions papers with solution for practice. For state boards, visit the official board site or trusted education portal.
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Hello Pruthvi,
Taking a drop year to reappear for the Karnataka Common Entrance Test (KCET) is a well-defined process. As a repeater, you are fully eligible to take the exam again to improve your score and secure a better rank for admissions.
The main procedure involves submitting a new application for the KCET through the official Karnataka Examinations Authority (KEA) website when registrations open for the next academic session. You must pay the required application fee and complete all formalities just like any other candidate. A significant advantage for you is that you do not need to retake your 12th board exams. Your previously secured board marks in the qualifying subjects will be used again. Your new KCET rank will be calculated by combining these existing board marks with your new score from the KCET exam. Therefore, your entire focus during this year should be on preparing thoroughly for the KCET to achieve a higher score.
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Yes, you can switch from Science in Karnataka State Board to Commerce in CBSE for 12th. You will need a Transfer Certificate from your current school and meet the CBSE school’s admission requirements. Since you haven’t studied Commerce subjects like Accountancy, Economics, and Business Studies, you may need to catch up before or during 12th. Not all CBSE schools accept direct admission to 12th from another board, so some may ask you to join Class 11 first. Make sure to check the school’s rules and plan your subject preparation.
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For the 12th CBSE Hindi Medium board exam, important questions usually come from core chapters like “Madhushala”, “Jhansi ki Rani”, and “Bharat ki Khoj”.
Questions often include essay writing, letter writing, and comprehension passages. Grammar topics like Tenses, Voice Change, and Direct-Indirect Speech are frequently asked.
Students should practice poetry questions on themes and meanings. Important questions also cover summary writing and translation from Hindi to English or vice versa.
Previous years’ question papers help identify commonly asked questions.
Focus on writing practice to improve handwriting and presentation. Time management during exams is key to answering all questions effectively.
Popular CBSE Class 12th Questions
A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is
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An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range
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A particle is projected at 600 to the horizontal with a kinetic energy . The kinetic energy at the highest point
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In the reaction,
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How many moles of magnesium phosphate, will contain 0.25 mole of oxygen atoms?
| Option 1)
0.02 |
Option 2)
3.125 × 10-2 |
| Option 3)
1.25 × 10-2 |
Option 4)
2.5 × 10-2 |
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