An ecologist conducts an experiment to study the effect of Co, concentration on

Question

An ecologist conducts an experiment to study the effect of Co, concentration on the productivity of sunflowers. She graphs the data by plotting CO, concentration on the x-axis and productivity on the y-axis. Her graph is shown below. Using her data, what do you predict will happen as the amount of CO2 in the atmosphere increases above level 11? A) Sunflower productivity will decrease as CO in the atmosphere increases 2 1 B) Sunflower productivity will increase as COirn C) Sunflower productivity will increase as CO, in D) Sunflower productivity will not be affected by the atmosphere increases the atmosphere decreases further changes in CO2 in the atmosphere 30 0 1 234S 78 11 CO, concentration

Explanation / Answer

First part: D) at level 11 sunflower productivity will not be affected by the further change in CO2 in the atmosphere.

sunflower is a C3 plant. The rate of photosynthesis in C3 plants is strongly dependent on CO2 concentration, this effect on photosynthesis, and hence on plant growth and productivity. Photosynthesis was much more responsive to CO2 at high than at low temperatures. At 350 mol mol1, photosynthesis at 35°C reached 51% of the rate that would have been possible with nonlimiting CO2, whereas at 5°C, 77% of the CO2 nonlimited rate was attained. Relative CO2 sensitivity also became smaller at elevated CO2, as CO2 concentration increased towards saturation. Photosynthesis was far from being saturated at the current ambient CO2 concentration, further gains in photosynthesis were predicted through continuing increases in CO2 concentration.

Second part: C is correct.

If population numbers exceed K, then population growth rate becomes negative and population numbers decline.

Third part: B) part of the fundamental niche of starling but not their realized niche.

A fundamental niche can be defined as the range of environmental conditions in which each of the species survives. The realized niche can be termed as the range of environmental conditions in which a species is really found.

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