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← Nature & AnimalsWhich mechanism limits coral growth under high phosphate conditions?
A)Phosphate competes for nitrate uptake✓
B)Zooxanthellae overproduce photosynthetic products
C)Coral bleaching from increased nutrients
D)Increased calcium carbonate precipitation rates
💡 Explanation
High phosphate reduces coral growth because phosphate competitively inhibits nitrate uptake, which blocks nitrogen fixation necessary for zooxanthellae photosynthesis; therefore growth is stunted, rather than enhanced photosynthesis or calcification increases, since both depend on algal symbionts.
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