CBSE 12th Standard Biology Subject Human Health and Disease HOT Questions 1 Marks Questions 2021 | QB365

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CBSE 12th Standard Biology Subject Human Health and Disease HOT Questions 1 Marks Questions 2021

Published on: 28/05/2021

QB365 Provides the HOT Question Papers for Class 12 Biology, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams

Download CBSE Class 12th Standard CBSE Biology question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Biology

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Std: 12th Standard CBSE - Biology

chapter: - HOT Questions

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Questions:

1 Marks

24 x 1 = 24

A drug is used by patients who underwent surgery. Name the drug and cause of its use.

Name the substance produced by a cell in viral infection that can protect other cells from further infection.

All respiratory diseases do not infect the lungs. ls it true?

A fish is used for eradication of a vector. Name the fish and the vector.

which type of organisms cause ringworm.

Name the scientist who discovered the life cycle of malarial parasite.

What c-onc or proto-onc genes?

What do you mean by withdrawal syndrome?

The chronic use of drugs & alcohol damages nervous system and liver, this is known as _________.

10.

Cancer causing genes are called ___________.

11.

On examining a patient ,he had a mass of proliferating cells damaging the neighboring tissues also. The doctor explained the disease to the patient. Name the disease and its property?

12.

It was diagnosed by a specialist that the immune system of a patient has been suppressed. A special test was done for confirmation. Name the test as well as the disease the patient was suffering? Also give its causative agent?

13.

Raju was curious to experiment a new brand of cigarette. Later on he found that he was unable to quit smoking. Can this lead to addiction and what other problems can crop up?

14.

On encountering a pathogen for the first time the response is generally low, but on second exposure to the same pathogen a highly intensified response is shown by the body .Give justification for this observation?

15.

Talking of defenses of a country, we know that there are barriers which prevent the entry of foreign agents into our country. Correlate this data with the defenses of the body and name some of the barriers of our body and what term is given for such defense / immunity?

16.

Mary Mallon, a cook along with her delicious food was also spreading Typhoid to many people. How could she do that without suffering or even knowing about it ? What was she nicknamed as? Also name the test conducted for the confirmation of the above disease.?

17.

A person is physical fit, exercises, eats balanced diet but his neighborhood was always noisy which disturbed his sleep. How can this situation affect the health of the person? Does this situation fit into the definition of health?

18.

Retro viruses have no DNA. However, the DNA of the infected host cell does possess viral DNA. How is it possible?

19.

Certain pathogens are tissue/organ specific.Justify the statement with suitable example.

20.

What would happen to immune system, if thymus gland is removed from the body of a person?

21.

How does tobacco smoking lead to oxygen deficiency in human body?

22.

Why does an AIDS patient suffer from many other infections?

23.

Which category of adaptive immunity is provided by vaccination? Why?

24.

What is it that prevents a child to suffer from a disease he/she is vaccinated against?Give one reason.

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Answers Key:

1 Marks

24 x 1 = 24

()
Opioids or opiates like morphine, etc., are used by patients underwent surgery because it is an effective pain killer.

()
Interferon.

()
Yes, many diseases like common cold, bronchitis, etc, does not infect lungs, but infects other accessory organs of respiratory system.

()
Gambusia fish, feed on larvae of mosquito.

()
Fungi

()
Sir Ronald Ross.

()
Cellular onco genes or proto onco genes are present in normal cells which ,when activated under certain conditions,could lead to oncogenic transformation of the cells.

()
When the regular dose of drugs /alcohol is abruptly discontinued ,the body to manifest an unpleasant syndrome characterised by anxiety, shakiness, nausea & sweating.

()
Cirrhosis

10.

()
Oncogenes

11.

()
Malignant tumour , Metastasis.

12.

()
ELISA, AIDS, HIV (Human immuno deficiency virus )

13.

()
Yes, increased incidence of lung cancer, coronary heart diseases, emphysema etc.

14.

()
Body has memory of the first encounter with the pathogen .This recognises the pathogen and shows heightened immune response.

15.

()
Barriers :- Physical (skin), Physiological (saliva), Cellular (WBC), Cytokine (interferons) Innate immunity (in born immunity)

16.

()
She was a carrier of typhoid.
She unknowingly was spreading typhoid through the food she prepared.
Typhoid Mary.
Widal test .

17.

()
No, he is not mentally fit.
According to WHO- “health is the state of physical, mental and social well being”.

18.

()
Retroviruses have RNA as the genetic material. After getting into the body of a person, the virus enters the macrophages. Here, RNA is replicated to form viral DNA by enzyme reverse transcriptase. The viral DNA now gets incorporated into the host cell's DNA and directs the infected cells to produce viruses.

19.

()
Certain pathogens are tissue/organ specific as they are adapted to overcome the resistance mechanisms of those tissues and organs, e.g. the pathogens that enter the gut must know a way surviving in the stomach at low p^H and must be resistant to various digestive enzymes.

20.

()
If thymus gland is removed from the body of a person, his immune system will become weak. As a result the person's body becomes prone to infectious diseases.

21.

()
Smoking leads to increases in the carbon monoxide (C0) content in the blood. which reduces the oxygen carrying capacity of haemoglobin.Hence, tobacco smoking leads to oxygen deficiency in the human body.

22.

()
Due to reduction in the number helper T-cells,the immune system of the person is weak and he suffers from infections that otherwise could have been overcome.

23.

()
Active Immunity it is called so because the antibodies are developed by the vaccinated person's own cells in response to the antigens.

24.

()
1. His body develops antibodies,that circulate in the body fluids and neutralise the pathogenic agent during subsequent encounters.
2. Memory B cells and memory T cells are retained inthe system.