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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 241 of 446
📘 CLASS XII
The progressive decrease in the number of ____ T-lymphocytes leads to immunodeficiency in an AIDS patient.
The progeny viruses attack other helper T-lymphocytes, leading to a progressive decrease in their number.
Question 242 of 446
📘 CLASS XII
The widely used diagnostic test for AIDS is ____.
ELISA (Enzyme Linked Immuno-Sorbent Assay) is the widely used diagnostic test for AIDS.
Question 243 of 446
📘 CLASS XII
In India, the ____ (NACO) and other NGOs educate people about AIDS.
The National AIDS Control Organisation (NACO) works extensively to educate people about AIDS.
Question 244 of 446
📘 CLASS XII
Normal cells show a property called ____ by virtue of which contact with other cells inhibits their uncontrolled growth.
Normal cells show a property called contact inhibition, which is lost in cancer cells.
Question 245 of 446
📘 CLASS XII
____ tumors normally remain confined to their original location and do not spread.
Benign tumors normally remain confined to their original location and do not spread.
Question 246 of 446
📘 CLASS XII
The most feared property of malignant tumors, where cells spread to distant sites through blood, is called ____.
The property of cancer cells spreading to distant sites is called metastasis.
Question 247 of 446
📘 CLASS XII
Physical, chemical, or biological agents that induce neoplastic transformation are called ____.
Agents that induce transformation are called carcinogens.
Question 248 of 446
📘 CLASS XII
Ionising radiations like X-rays and ____ rays cause DNA damage leading to neoplastic transformation.
Ionising radiations like X-rays and gamma rays cause DNA damage.
Question 249 of 446
📘 CLASS XII
Cancer detection is based on biopsy and ____ studies of the tissue.
Cancer detection is based on biopsy and histopathological studies of the tissue.
Question 250 of 446
📘 CLASS XII
____ uses X-rays to generate a three-dimensional image of the internals of an object.
Computed Tomography (CT) uses X-rays to generate a three-dimensional image.
