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Human Health and Disease MCQs
Class XII Biology
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NCERT Based
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NEET Practice
📘 Concept Based
📝 Exam Level
🤖 AI Explanations
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446 questions in this chapter
Question 231 of 446
📘 CLASS XII
____ is cited as an example of an auto-immune disease that affects many people.
Rheumatoid arthritis which affects many people in our society is an auto-immune disease.
Question 232 of 446
📘 CLASS XII
The primary lymphoid organs where lymphocytes originate and mature are the bone marrow and ____.
The primary lymphoid organs are bone marrow and thymus.
Question 233 of 446
📘 CLASS XII
The spleen acts as a filter of the blood by trapping micro-organisms and also has a large reservoir of ____.
Spleen also has a large reservoir of erythrocytes.
Question 234 of 446
📘 CLASS XII
Mucosa-Associated Lymphoid Tissue (____) constitutes about 50 per cent of the total lymphoid tissue in the human body.
MALT constitutes about 50 per cent of the lymphoid tissue in human body.
Question 235 of 446
📘 CLASS XII
The word 'Syndrome' in Acquired Immuno Deficiency Syndrome (AIDS) means a group of ____.
‘‘Syndrome’’ means a group of symptoms.
Question 236 of 446
📘 CLASS XII
HIV belongs to a group of viruses called ____, which have an envelope enclosing the RNA genome.
HIV is a member of a group of viruses called retrovirus.
Question 237 of 446
📘 CLASS XII
Transmission of HIV-infection generally occurs by sexual contact with an infected ____.
Transmission of HIV-infection generally occurs by sexual contact with infected person.
Question 238 of 446
📘 CLASS XII
The time-lag between HIV infection and the appearance of AIDS symptoms usually varies from a few months to many years, typically ____.
The time-lag may vary from a few months to many years (usually 5-10 years).
Question 239 of 446
📘 CLASS XII
The viral RNA genome of HIV replicates to form viral DNA with the help of the enzyme ____.
The RNA genome of the virus replicates to form viral DNA with the help of the enzyme reverse transcriptase.
Question 240 of 446
📘 CLASS XII
In the body, the ____ continue to produce virus and thus act like an HIV factory.
The macrophages continue to produce virus and act like a HIV factory.
