and data from datanuggets To determine whether eutrophication is in the Plum isl

Question

and data from datanuggets To determine whether eutrophication is in the Plum island estiary researchers measured the levels orassolvod o2 in the water and the chanams ir the amount of dissolved dawn occurring measured at two locations. Upper Estuary farther from the osureise)to dusk (surseo In this gaph desolved o2 was ocean) and Lower Estuary (closer to the ocean Part of Estuary amount of o2 dissolved in water heher at dusk than it is at dawn? select wry the erage thessstem net o2 producton by protosynthesis is than net o2 consumption by respiraton, Becausealsae plants produce on during the day and deoomposersoonsume02 during the e Because algae and plants produce 02 dunng the day and consumo 02 dur re the nght D Becaua ae and plants produce co2dunngtho nght QUESTION tear and data from datanuiEets ora in the Estuaycompared to that Based on data an the graph above you can condude that

Explanation / Answer

Question 7: Answer is A

explanation: The photosynthetic process takes in carbon dioxide and water to form glucose and oxygen in the prescencce of sunlight. Since photosynthetic rates are higher than respiration rates, net evolution rates of oxygen during this process is higher.But photosynthesis does not occur during the absence of sunlight in other words from dusk to dawn and therefore only respiration happens decreasing the net oxygen level.

Question 8 Answer A

Explanation: This may be due to abundance of algae and plants more towards the lower estuary when compared to upper estuary.

Question 9: Answer is B

Question 10: Explanation for question 9-Plants and algae generally tend to grow in abundance in places where the nutrient content of the water is high. Upper estuary area will have surface run offs coming directly from surrounding regions and lands and will have a richer nutrient content that gets progressively diluted when this water is flowing. When water is tested towards the lower end of the estuary there will be significant decrease in nutrients and therefore the plant and algal population in that area will also be reduced compared to the upper estuary.

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