In this experiment, you will be monitoring changes in CO2 concentration due to aerobic respiration and photosynthesis of each test organism. Which of the following results would be expected from the conditions described? Remember this is a closed system (the CO2 cannot escape), and we are monitoring changes in CO2 concentration over a 3 minute period. A) A plant will cause an overall higher increase in CO2 concentration when exposed to light versus an plant kept in the dark. B) A plant will cause an overall higher increase of CO2 concentration when kept in the dark versus a plant exposed to light. C) An animal will produce a higher increase in CO2 when exposed to the light than when kept in the dark. D) An animal will show a decrease in CO2 while kept in the dark and an increase in CO2 while in the light.
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1) Plants perform photosynthesis when exposed to light, which consumes CO2 and produces O2. Show more…
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After reading the paragraph below, answer the question that follows. You're conducting an experiment to determine the effect of different wavelengths of light on the absorption of carbon dioxide as an indicator of the rate of photosynthesis in aquatic ecosystems. If the rate of photosynthesis increases, the amount of carbon dioxide in the environment will decrease, and vice versa. Small aquatic plants are placed into three containers of water mixed with carbon dioxide. Container A is placed under normal sunlight, B under green light, and C under red light. The containers are observed for a 24-hour period. Based on your knowledge of the process of photosynthesis, the plant in the container placed under red light would probably absorb less CO2 than the plants under the green light. absorb more CO2 than the plants under the green light. absorb the same amount of CO2 as the plants under the green light. absorb no CO2.
Jennifer H.
A plant is exposed to increasing light intensity from very dim to bright light, while the carbon dioxide concentration and temperature are kept at an optimum level. What will happen to the rate of oxygen production? A. It will increase exponentially. B. It will remain constant. C. It will decrease to a minimum level. D. It will increase to a maximum level.
Madhur L.
Photosynthesis in plants can be represented by the following overall equation: $$6 \mathrm{CO}_{2}(g)+6 \mathrm{H}_{2} \mathrm{O}(l) \stackrel{\text { Light }}{\longrightarrow} C_{6} \mathrm{H}_{12} \mathrm{O}_{6}(s)+6 \mathrm{O}_{2}(g)$$ Algae grown in water containing some $^{18} \mathrm{O}$ (in $\mathrm{H}_{2}^{18} \mathrm{O}$ ) evolve oxygen gas with the same isotopic composition as the oxygen in the water. When algae growing in water containing only $^{16} \mathrm{O}$ were furnished carbon dioxide containing $^{18} \mathrm{O},$ no $^{18} \mathrm{O}$ was found to be evolved from the oxygen gas produced. What conclusions about photosynthesis can be drawn from these experiments?
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