Question

question 2
a student sets up an investigation by placing a plastic bag over a plant. she secures the plastic bag so that it is completely sealed and nothing can enter. she observes the plant daily to see if it remains green and healthy.
which two questions is this investigation, as described, designed to answer?
□ a can the plant perform photosynthesis without a large supply of carbon dioxide?
□ b can the plant perform respiration without a large supply of oxygen?
□ c can the plant perform photosynthesis without a large supply of oxygen?
□ d can the plant perform photosynthesis faster than a plant that is not sealed?
□ e can the plant perform respiration faster than a plant that is not sealed?
□ f can the plant perform respiration without a large supply of carbon dioxide?

Explanation:

The investigation seals a plant to limit gas exchange. Photosynthesis requires CO₂; without new CO₂ (sealed), the plant's ability to perform photosynthesis (a) is tested. Respiration requires O₂; sealed conditions limit O₂, testing respiration without large O₂ supply (b). Other options are irrelevant (c: photosynthesis doesn't need O₂; d,e: no control group; f: respiration uses O₂, not CO₂).

Answer:

a. Can the plant perform photosynthesis without a large supply of carbon dioxide?, b. Can the plant perform respiration without a large supply of oxygen?