My answer have *(star) next to it, I try to figure it out which Question I get w

Question

My answer have *(star) next to it, I try to figure it out which Question I get wrong, hope some one can help me out

1.A paw paw tree is growing in an environment where the CO2 concentration is 250ppm and the light intensity is 900ft candles. Which one has a greater impact on the rate of photosynthesis in this plant?

A.Light because 250ppm CO2 is at the maximum amount that can be fixed by a plant

B.CO2, because a light intensity of 900ft candles is insufficient for adequate carbon fixation

C.The CO2 concentrations because it limits the amount of carbon that can be fixed

D.Light because the levels are too low for the plant to fix carbon

3. There is a threshold at which increasing concentrations of CO2 no longer significantly increase the rate of photosynthesis. True* or False

4. During photosynthesis, visible light has enough energy to?

A.force electrons in chlorophyll closer to the nucleus

B.split water molecules into hydrogen and oxygen

C.split water and excite electrons in the chlorophyll molecule

D.elevate electrons in chlorophyll to higher energy states***

5. What accumulates inside the thylakoid compartment during the light-dependent reactions?

A.oxygen

B.Hydrogen Ions**

C.ATP

6. For every six carbon dioxide molecules that enter the Calvin cycle and are fixed, ___ 3-carbon compounds are released /removed from the cycle and the remaining___ 3-carbon molecules continue in the cycle to remake RuBP.

A.6,0

B.3,6

C.2,10***

D.10, 2

7.Light-dependent reactions occur at the.....

A. plasma membrane

B. cytoplasm

C. stroma

D. thylakoid membrane*****

8. If the normal CO2 atmospheric concentration is 300 ppm what can we predict about photosynthetic limitations in natural environments?

A. Photosynthesis is probably not functioning at its full capacity in natural environments***

B. Photosynthesis is functioning at maximal capacity in the natural environment

C. In the natural environment photosynthesis is limited by the CO2 concentration

D.In the natural environment there is an abundance of CO2 for photosynthesis***

9.Full sunlight has an intensity of approximately 10,000 ft-c., relate this to the data that you collected in these experimental conditions. What can you predict about the effect of light intensity on photosynthesis in natural environments?

A.Light levels are often a limitation to photosynthesis in natural environments****

B.Light is not a limitation for photosynthesis for most plants

C.In direct sunlight, photosynthesis is not limited by light levels****

10.As the time interval increases the rate of photosynthesis will....

A.Decrease****

B.Increase

C.Stay the same

11.How do increasing CO2 concentrations affect the rate of photosynthesis?

A. CO2 concentrations do not impact photosynthetic rates

B. As CO2 concentrations increase, photosynthetic rates decrease

C. As CO2 increases in concentration, photosynthetic rates increase****

Explanation / Answer

B.CO2, because a light intensity of 900ft candles is insufficient for adequate carbon fixation

True

D. elevate electrons in chlorophyll to higher energy states

B. Hydrogen Ions

C.2,10

D. thylakoid membrane

D.In the natural environment there is an abundance of CO2 for photosynthesis

A.Light levels are often a limitation to photosynthesis in natural environments and C.In direct sunlight, photosynthesis is not limited by light levels

C.Stay the same

C. As CO2 increases in concentration, photosynthetic rates increase

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