1. Carbon Dioxide in Pond Water Biological activity in a pond is reflected in th
ID: 698692 • Letter: 1
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1. Carbon Dioxide in Pond Water Biological activity in a pond is reflected in the rate at which carbon dioxide, CO2, is added to or withdrawn from the water. Plants take CO2 out of the water during the day for photosynthesis and put CO2 into the water at night. Animals put CO2 into the water all the time as they breathe. Biologists are interested in how the net rate at which CO2 enters a pond varies during the day. Figure 5.76 shows this rate as a function of time of day.9 The rate is measured in millimoles (mmol) of CO2 per liter of water per hour; time is measured in hours past dawn. At dawn, there were 2.600 mmol of CO2 per liter of water. (a) What can be concluded from the fact that the rate is negative during the day and positive at night? (b) Some scientists have suggested that plants respire (breathe) at a constant rate at night, and that they photosynthesize at a constant rate during the day. Does Figure 5.76 support this view? (c) When was the CO2 content of the water at its lowest? How low did it go? (d) How much CO2 was released into the water during the 12 hours of darkness? Compare this with the amount of CO2 withdrawn from the water during the 12 hours of daylight. quantity How can you tell by looking at the graph whether the CO2 in the pond is in equilibrium? te the CO2 content of the water at three-hour intervals throughout the day. Use your (e) Estima estimates to plot a graph of CO2 content throughout the dayExplanation / Answer
a}at 20 p.m. rate is 0.02mmol/lit hr,it falls till 1.45 a.m. say -0.045 mmol/lithr stable for 15 minutes and afterwards again from 2.00 a.m. it rises till 13 p.m. in the afternoon. it falls negatively during night only.but rate is so slow that during dawn till 12.00 p.m. it remains negative.probably we can say half the day it is negative and half the night it is negative.
b} yes.graph supports it
c} it becomes lowest at the rate 0.045 mmol/lit hr. at 1.45 a.m.
d} during night carbon dioxide withdrawalis 0.0265 mmol/lit from 18 p.m. to 24.00p.m. and during day 0.057mmol/lit of it addeed from 12 to 18 p.m.
e}
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