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CXC CSEC Exam

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A scientist is growing a water plant in a beaker of water with hydrogencarbonate indicator. The setup is placed under a lamp. Initially, the indicator is red. After one hour, it turns purple. What is the MOST likely limiting factor for photosynthesis at this point? (Indicator colours: Yellow = high CO₂, Red = normal CO₂, Purple = low CO₂)
Correct Answer:
Carbon dioxide concentration

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