CBSE Class 12 Biology Human Health and Diseases Cross Word

CBSE Class 12 Biology Human Health and Diseases Cross Word. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.

Important Questions for NCERT Class 12 Biology Human Health and Diseases

Ques. Interferons are synthesized in response to
(a) mycoplasma (b) bacteria
(c) viruses (d) fungi. 

Answer: C

Ques. The antibodies are
(a) proteins (b) carbohydrates
(c) lipids (d) germs. 

Answer: A

Ques. The term ‘active immunity’ means
(a) increasing rate of heart beat
(b) increasing quantity of blood
(c) resistance developed after disease
(d) resistance developed before disease.

Answer: C

Ques. If a person shows production of interferons in his body, the chances are that he has got an infection of
(a) tetanus (b) malaria
(c) typhoid (d) measles. 

Answer: D

Ques. Antibodies are produced by
(a) leucocytes (b) monocytes
(c) lymphocytes (d) spleen. 

Answer: C

Ques. The interferons are
(a) antigen proteins (b) antiviral proteins
(c) antibiotic proteins (d) all of these. 

Answer: B

Ques. Which one of the following diseases is due to an allergic reaction?
(a) Enteric fever (b) Skin cancer
(c) Goitre (d) Hay fever 

Answer: D

Ques. Antigens are present
(a) inside the cytoplasm
(b) on nuclear membrane
(c) inside the nucleus
(d) on cell surface. 

Answer: D

Ques. A cell-coded protein that is formed in response to infection, with most animal viruses, is called
(a) histone (b) antibody
(c) interferon (d) antigen. 

Answer: C

Ques. Which of the following is correct regarding AIDS causative agent HIV?
(a) HIV is enveloped virus containing one molecule of single-stranded RNA and one molecule of reverse transcriptase.
(b) HIV is enveloped virus that contains two identical molecules of single-stranded RNA and two molecules of reverse transcriptase.
(c) HIV is unenveloped retrovirus.
(d) HIV does not escape but attacks the acquired immune response.

Answer: B

Ques. HIV that causes AIDS, first starts destroying
(a) helper T-lymphocytes
(b) thrombocytes
(c) B-lymphocytes
(d) leucocytes. 

Answer: A

Ques. At which stage of HIV infection does one usually show symptoms of AIDS?
(a) Within 15 days of sexual contact with an infected person
(b) When the infected retro virus enters host cells
(c) When HIV damages large number of helper T - lymphocytes
(d) When the viral DNA is produced by reverse transcriptase 

Answer: C

Ques. Which one of the following statements is correct with respect to AIDS?
(a) The HIV can be transmitted through eating food together with an infected person.
(b) Drug addicts are least susceptible to HIV infection.
(c) AIDS patients are being fully cured cent per cent with proper care and nutrition.
(d) The causative HIV retrovirus enters helper T-lymphocytes thus reducing their numbers.

Answer: D

Ques. Human immuno deficiency virus (HIV) has a protein coat and a genetic material which is
(a) double stranded RNA
(b) double stranded DNA
(c) single stranded DNA
(d) single stranded RNA. 

Answer: D

Ques. Which of the following statements is not true for cancer cells in relation to mutations?
(a) Mutations inactivate the cell control.
(b) Mutations inhibit production of telomerase.
(c) Mutations in proto-oncogenes accelerate the cell cycle.
(d) Mutations destroy telomerase inhibitor.

Answer: B

Ques. Which one of the following is not a property of cancerous cells, whereas the remaining three are?
(a) They compete with normal cells for vital nutrients.
(b) They do not remain confined in the area of formation.
(c) They divide in an uncontrolled manner.
(d) They show contact inhibition. 

Answer: D

Ques. Which one of the following techniques is safest for the detection of cancers?
(a) Magnetic resonance imaging (MRI)
(b) Radiography (X-ray)
(c) Computed tomography (CT)
(d) Histopathological studies 

Answer: A

Ques. Carcinoma refers to
(a) malignant tumours of the connective tissue
(b) malignant tumours of the skin or mucous membrane
(c) malignant tumours of the colon
(d) benign tumours of the connective tissue. 

Answer: B

Ques. Cancerous cells can easily be destroyed by radiations due to
(a) rapid cell division (b) lack of nutrition
(c) fast mutation (d) lack of oxygen. 

Answer: A

Ques. Reason of lung cancer is
(a) coal mining (b) calcium fluoride
(c) cement factory (d) bauxite mining. 

Answer: A

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