alleryWhich of the following is NOT a recognised source of adult stem cells in the human body?
ARed bone marrow
BTooth enamel
CAdipose connective tissue
DBlood
Answer & Solution
Correct answer: B. Tooth enamel
1. Adult stem cells come from three main body sources: red bone marrow, adipose connective tissue and blood.
2. Cord blood collected just after birth is an additional source.
3. Tooth enamel is a hard non-cellular mineral surface and is not listed as a stem cell source, so it is the exception.
4. The other three options are all genuine adult stem cell sources.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 8 "Cell Biology and Biotechnology", p.98_
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