NEET MCQs Practice on Human Health and Disease Class-XII Biology, Free unlimited practice on Human Health and Disease Class-XII Biology Mcqs

Question 61 of 446

📘 CLASS XII

Lymphoid tissue located within the lining of the major tracts (respiratory, digestive, urogenital) is called:

Lymphoid tissue located within the lining of the major tracts is called mucosa-associated lymphoid tissue (MALT).

Question 62 of 446

📘 CLASS XII

MALT constitutes about what percentage of the total lymphoid tissue in the human body?

MALT constitutes about 50 per cent of the lymphoid tissue in human body.

Question 63 of 446

📘 CLASS XII

The word 'Syndrome' in Acquired Immuno Deficiency Syndrome (AIDS) means:

‘‘Syndrome’’ means a group of symptoms.

Question 64 of 446

📘 CLASS XII

AIDS is caused by Human Immuno deficiency Virus (HIV), which is a member of which viral group?

HIV is a member of a group of viruses called retrovirus.

Question 65 of 446

📘 CLASS XII

Which route of transmission is NOT generally associated with HIV infection?

HIV is transmitted via body fluids, through sexual contact, blood transfusion, sharing needles, or mother to child via placenta. It is not spread by mere touch or physical contact.

Question 66 of 446

📘 CLASS XII

The time-lag between HIV infection and the appearance of AIDS symptoms typically varies from:

There is always a time-lag between the infection and appearance of AIDS symptoms. This period may vary from a few months to many years (usually 5-10 years).

Question 67 of 446

📘 CLASS XII

In the lifecycle of HIV, the enzyme reverse transcriptase helps the viral RNA genome to replicate and form:

RNA genome of the virus replicates to form viral DNA with the help of the enzyme reverse transcriptase.

Question 68 of 446

📘 CLASS XII

Which host cells continue to produce virus and act like an "HIV factory"?

The macrophages continue to produce virus and in this way acts like a HIV factory.

Question 69 of 446

📘 CLASS XII

The progressive decrease in the number of which specific immune cell leads to immunodeficiency in an AIDS patient?

The progeny viruses attack other helper T-lymphocytes, leading to a progressive decrease in their number.

Question 70 of 446

📘 CLASS XII

Due to immunodeficiency, AIDS patients frequently suffer from infections caused by bacteria, especially:

The person suffers from infections due to bacteria especially Mycobacterium, viruses, fungi and even parasites like Toxoplasma.

Human Health and Disease MCQs