alleryDiabetes mellitus is mainly caused by:
AToo much insulin in the blood
BExcess thyroxine from thyroid
CToo much adrenaline from adrenal
DInsufficient insulin from pancreas
Answer & Solution
Correct answer: D. Insufficient insulin from pancreas
1. Insulin lowers blood sugar by storing glucose as glycogen.
2. If the pancreas cannot make **enough insulin**, blood glucose remains high.
3. The disease that results is diabetes mellitus.
4. Excess insulin causes hypoglycaemia, not diabetes; thyroxine and adrenaline have different roles.
_Source: Selina Concise ICSE Class 8 Biology Ch 5 "Endocrine System and Adolescence", Hormone-related disorders_
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