Note: Respond To All Questions From Part A To C A. What major metabolic pathway(

Question

Note: Respond To All Questions From Part A To C

A. What major metabolic pathway(s) are occurring in plants: In the beaker placed in the dark? Explain In the beaker placed in the light? Explain Explain this statement: the rate of CO2 absorbed by the organisms is a measure of photosynthesis The plant in the dark should actually require the most drops of base for titration, even more than the control beaker with no plant. What does this mean in terms of CO2 usage or production by the plant in the dark? Do plants undergo cellular respiration? B. C.

Explanation / Answer

A.

Dark = Respiration (Glycolysis, TCA cycle, and ETC)

Light = Photosynthesis

B.

CO2 is the reactant in the photosynthetic pathway. CO2 concentration can be a limiting factor for photosynthesis. Hence, the rate of CO2 absorbed can be an indirect measure of a plant's photosynthetic rate.

6CO2 + 6H2O -----> C6H12O6 + 6O2

C.

Yes. Plants do perform respiration in dark.

Respiration is a light-independent pathway.

Depending upon the presence or absence of oxygen, respiration can be anaerobic or aerobic.

Aerobic: C6H12O6 + 6O2 ---> 6CO2 + 6H2O

Anaerobic: C6H12O6 ---> 2C2H5OH + 2 CO2

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