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The finger-like projections of the inner mitochondrial membrane that increase its surface area are called:
AThylakoids
BGrana
COxysomes
DCristae
Answer & Solution
Correct answer: D. Cristae
1. The inner mitochondrial membrane is folded inward.
2. These finger-like folds are called cristae.
3. They increase the inner surface area to hold more enzymes.
4. Oxysomes are the small particles on the cristae, not the folds themselves, so they are the trap.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 12 Plant Anatomy and Plant Physiology "Structure of Mitochondria", p.190_
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