Question

You are a plant biologist conducting an experiment to look at the effect of different frequencies of light on the rate of photosynthesis in aquatic plants. To determine the rate of photosynthesis, you measure the absorption of CO2 by the plant from the surrounding water using a dissolved CO2 (dCO2) meter. As the rate of photosynthesis increases, the amount of CO2 in the water will decrease, and vice versa. To conduct the experiment, you place aquatic plants in three containers of water mixed with CO2. Each container is hooked up to a dCO2 meter. Container X is placed under normal sunlight, Y is placed under green light, and Z is placed under red light. After 24 hours, you measure the amount of dissolved CO2 in each container. You find that the water in container X has the least amount of CO2, the water in container Y has the most, and the water in container Z has an intermediate amount of CO2. Of the following options, choose the one that is the best explanation for your observation. Reject all the rest. Accept/Reject: The plant in container X has been damaged by the sunlight and is unable to produce CO2. Accept/Reject: The plant in container X is absorbing the full spectrum of light and so can photosynthesize the most. Accept/Reject: The plant in container Y is receiving the most amount of green light and so can produce the most amount of CO2. Accept/Reject: The plant in container Z is absorbing red light and so can photosynthesize the most. Accept/Reject: The plant in container Y has been damaged by the green light and is unable to absorb CO2.

You are a plant biologist conducting an experiment to look at the effect of different frequencies of light on the rate of photosynthesis in aquatic plants. To determine the rate of photosynthesis, you measure the absorption of CO2 by the plant from the surrounding water using a dissolved CO2 (dCO2) meter. As the rate of photosynthesis increases, the amount of CO2 in the water will decrease, and vice versa.

To conduct the experiment, you place aquatic plants in three containers of water mixed with CO2. Each container is hooked up to a dCO2 meter. Container X is placed under normal sunlight, Y is placed under green light, and Z is placed under red light. After 24 hours, you measure the amount of dissolved CO2 in each container. You find that the water in container X has the least amount of CO2, the water in container Y has the most, and the water in container Z has an intermediate amount of CO2.

Of the following options, choose the one that is the best explanation for your observation. Reject all the rest.

Accept/Reject: The plant in container X has been damaged by the sunlight and is unable to produce CO2.
Accept/Reject: The plant in container X is absorbing the full spectrum of light and so can photosynthesize the most.
Accept/Reject: The plant in container Y is receiving the most amount of green light and so can produce the most amount of CO2.
Accept/Reject: The plant in container Z is absorbing red light and so can photosynthesize the most.
Accept/Reject: The plant in container Y has been damaged by the green light and is unable to absorb CO2.

Added by Christopher T.

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