Students can use Curiosity Class 8 Science Book Solutions Chapter 3 Health The Ultimate Treasure Class 8 Question and Answer as a quick reference guide.
Class 8 Science Chapter 3 Health The Ultimate Treasure Question Answer
Science Class 8 Chapter 3 Question Answer Health The Ultimate Treasure
Health The Ultimate Treasure Class 8 Question Answer (InText)
Question 1.
How does the body fight a common cold? (Page 28)
Answer:
When a cold occurs, the body’s defence system gets activated. Fever may develop to help kill the virus, and mucus is produced to trap and remove the germs.
Question 2.
Why are there fewer cases of smallpox or polio but more cases of diabetes and heart problems now-a-days? (Page 28)
Answer:
Vaccination programs have controlled diseases like smallpox and polio. However, unhealthy eating habits and lack of exercise have increased diseases such as diabetes and heart problems.
Question 3.
Can climate change cause new types of diseases? (Page 28)
Answer:
Climate change can lead to more diseases. Warmer weather allows mosquitoes to spread malaria and dengue to new areas, and germs may change or spread differently.
Question 4.
How do stress and worry affect health and cause Sickness? (Page 28)
Answer:
Long-term stress weakens the immune system, making the body more prone to illness. Stress can also cause high blood pressure, digestion problems, and mental health issues.
Question 5.
Why are some groups of people affected more during disease outbreaks? (Page 28)
Answer:
People who are poor, live in crowded places, eat unhealthy food, or lack access to proper healthcare tend to fall sick more often during outbreaks.
Question 6.
Is being healthy just about not having diseases? (Page 29)
Ans.
No, being healthy is not just about not having diseases, because being healthy means complete physical, mental and social well-being, and not merely state of absence of disease or infirmity.
Question 7.
How did ones habits and surroundings affect ones health? (Page 29)
Answer:
Lack of social interaction negatively affects persons mental and physical health, making person weak and sick.
Question 8.
What lifestyle changes can help prevent or manage common lifestyle diseases? (Page 30)
Answer:
Eating healthy food, exercising regularly, managing stress, avoiding tobacco and alcohol, and going for regular health check-ups help prevent lifestyle diseases.
Question 9.
How do pathogens spread from one person to another? (Page 32)
Answer:
Pathogens can spread by following ways:
- Through air, when an infected person coughs or sneezes.
- Through direct contact like shaking hands.
- Through vectors like insects.
Question 10.
Are diseases always caused by infections? (Page 35)
Answer:
No, not all diseases are caused by infections. Some diseases are non-infectious and result from poor lifestyle, genetic factors, or lack of nutrients, such as diabetes, cancer, or anaemia.
Question 11.
What will happen if a person takes an excess amount of iodine? (Page 36)
Answer:
Excess intake of iodine can lead to thyroid gland
problems, such as hyperthyroidism, where the gland becomes overactive. It may also cause symptoms like weight loss, fast heartbeat, and irritability.
NCERT Class 8 Science Chapter 3 Question Answer Health The Ultimate Treasure (Exercise)
Question 1.
Group the diseases shown in the images as communicable or non-communicable.
Answer:
Diseases are grouped as
Communicable diseases: Cold and flu, typhoid, Chickenpox
Non-communicable diseases: Diabetes, asthma
Question 2.
Diseases can be broadly grouped into communicable and non-communicable disease. From the options given below, identify the non-communicable diseases.
(i) Typhoid (ii) Asthma (iii) Diabetes (iv) Measles
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
Answer:
The correct answer is opiton (b) asthma and diabetes. These are non-communicable diseases as they do not spread from one person to another.
Question 3.
There is a flu outbreak in your school. Several classmates are absent, while some are still coming to school coughing and sneezing.
(i) What immediate actions should the school take to prevent further spread?
(ii) If your classmate, who shares the bench with you, starts showing symptoms of the flu, how can you respond in a considerate way without being rude or hurtful?
(iii) How can you protect yourself and others from getting infected in this situation?
Answer:
(i) The school should isolate sick students, sanitise classrooms regularly, encourage mask-wearing, and teach students about covering their mouth while coughing or sneezing.
(ii) One should politely suggest the classmate to visit the school nurse and maintain distance without hurting their feelings.
(iii) One should wash hands frequently, avoid touching face, wear a mask, and stay away from sick students.
Question 4.
Your family is planning to travel to another city where malaria is prevalent. (Competency Based Que.)
(i) What precautions should you take before, during and after the trip?
(ii) How can you explain the importance of mosquito nets or repellents to your sibling?
(iii) What could happen if travellers ignore health advisories in such areas?
Answer:
(i) Before the trip: Take antimalarial medicines and pack mosquito repellents.
During the trip: Use mosquito nets, wear full-sleeved clothes and apply repellents.
After the trip: Check for fever and visit a doctor if any symptoms appear.
(ii) I can explain that mosquito nets protect us by keeping mosquitoes away, and repellents prevent mosquitos from biting.
(iii) If health advisories is ignored, travelers may catch malaria and spread it to others when they return.
Question 5.
Your uncle has started smoking just to fit in with his friends, even though it is well known that smoking can seriously harm health and even cause death.
(i) What would you say to him to make him stop, without being rude?
(ii) What would you do if your friend offers you a cigarette at a party?
(iii) How can schools help prevent students from indulging in such harmful habits?
Answer:
(i) I would tell my uncle politely that smoking is harmful and suggest better ways to spend time with friends, like exercising or taking up a hobby.
(ii) If my friend offers me a cigarette, I would refuse politely and suggest doing something else instead.
(iii) Schools should organise awareness programs, provide counseling, and encourage healthy habits to stop students from starting harmful habits.
Question 6.
Saniya claims to her friend Vinita that ‘Antibiotics can cure any infection, so we do not need to worry about diseases.’ What question(s) Vinita ask her to help Saniya understand that her statement is incorrect?
Answer:
Vinita can ask the following questions
(i) Do antibiotics cure viral infections like colds or flu?
(ii) Have you heard of antibiotic resistance where medicines stop working?
(iii) Can antibiotics cure diseases like diabetes which are not caused by germs?
Question 7.
The following table contains information about the number of dengue cases reported in a hospital over a period of one year. (Competency Based Que.)
Make a bar graph of the number of cases on the Y-axis and the month on the X-axis. Critically analyse your findings and answer the following.
(i) In which three months were the dengue cases highest?
(ii) In which month(s) were the cases lowest?
(iii) What natural or environmental factors during the peak months might contribute to the increase in dengue cases?
(iv) Suggest a few preventive steps that the community or government can take before the peak season to reduce the spread of denuge.
Answer:
(i) The highest number of dengue cases were reported in July, August and September.
(ii) The lowest cases were reported in January and February.
(iii) Heavy rainfall and stagnant wates during monsoon months create ideal breeding sites for mosquitoes.
(iv) Preventive steps include removing stagnant water, using mosquito nets and repellents, and spreading public awareness.
Question 8.
Imagine you are incharge of a school health campaign. What key messages would you use to reduce communicable and non-communicable diseases?
Answer:
For communicable diseases: Always wash hands, take vaccines on time, and maintain cleanliness.
For non-communicable diseases: Eat a healthy diet, do exercise regularly, and manage stress.
General health tips: Go for regular health check-ups and avoid smoking and alcohol.
Question 9.
It is recommended that we should not take an antibiotic for a viral infection like a cold, a cough, or
flu. Can you provide the possible reason for this recommendation?
Answer:
It is not recommended to take antibiotics for viral infections like cold, cough, or flu because antibiotics work only against bacteria, not viruses. Taking them wrongly can cause antibiotic resistance.
Question 10.
Which disease (s) among the following may spread if drinking water gets contaminated by the excreta from infected person?
Hepatitis-A, Tuberculosis, Poliomyelitis, Cholera, Chickenpox.
Answer:
Diseases that spread through contaminated drinking water are hepatitis A, poliomyelitis and cholera.
Question 11.
When our body encounters a pathogen for the first time, the immune response is generally low but on exposure to the same pathogen again, the immune response by the body is much more compared to the first exposure. Why is it so?
Answer:
When our body faces a germ for the first time, it takes time to fight it. After the first infection, the body makes memory cells that help it recognise the same germ quickly and fight it faster and stronger the next time.