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Factors affecting photosynthesis Transitional Reasoning Practice

Biology · Cellular Energetics · Biology · Photosynthesis

1 Biology practice questions on Factors affecting photosynthesis. Questions that build towards applied reasoning.

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  1. 1.

    An experiment measured the rate of oxygen production in aquatic plant shoots exposed to varying light intensities and dissolved carbon dioxide concentrations at a constant, optimal temperature of 25°C. At low light intensity, increasing the carbon dioxide concentration produced no measurable change in the rate of oxygen production. However, when light intensity was increased, the photosynthetic rate rose sharply until it leveled off, after which only an increase in carbon dioxide concentration could further elevate the rate. Which conclusion is best supported by these experimental findings?

    • A) Light intensity remained the sole factor limiting photosynthesis across all tested environmental conditions.
    • B) Carbon dioxide concentration directly determines the activation energy of light-dependent photolysis at low light levels.
    • C) Temperature must have dropped below the enzymatic optimum when the rate leveled off at elevated light intensity.
    • D) Photosynthetic rate is constrained by the factor nearest its minimum, shifting the primary limitation from light availability to carbon dioxide availability as light levels rise.

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