The cost of NOT performing 2 cycles of photorespiration is

1 C in the form of CO2

4 C in the form of 2 molecules of phosphoglycolate

1 C (as CO2), 2 ATP, 2 NADPH equivalents, and one molecule ofNH4+

3 ATP and 2 NADPH

5 ATP and 2 NADPH

As temperature increases, the quantum yield of photosynthesis inC3 plants is directly affected by

The decreasing ratio of CO2 to O2 in the aqueous phase

The increasing ratio of CO2 to O2 in the aqueous phase

The decreasing ratio of CO2 to O2 in the gas phase

The increasing ratio of CO2 to O2 in the gas phase

In CAM plants and ‘regular’ C4 plants, the enzyme that firstfixes CO2 into an organic molecule is

Ribulose 1,5-bisphosphate carboxylase/oxygenase for both

Phosphoenolpyruvate carboxylase (PEPC) for both

NADP-malic enzyme for both

Rubisco in CAM, PEPC in ‘regular’ C4

Rubisco in ‘regular’ C4, PEPC in CAM

In CAM (crassulacean acid metabolism) plants, when and where

are sugars produced?

During the night, in mesophyll cells

During the day, in mesophyll cells

During the night, in bundle sheath cells

During the day, in bundle sheath cells

QUESTION 10

In ‘regular’ C4 plants, when and where are sugars

produced?

During the night, in mesophyll cells

During the day, in mesophyll cells

During the night, in bundle sheath cells

During the day, in bundle sheath cells