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Chapter 10: Q2TYU (page 187)

Which of the following sequences correctly represents the flow of electrons during photosynthesis?

(A)\({\rm{NADPH}}\, \to {{\rm{O}}_{\rm{2}}} \to {\rm{C}}{{\rm{O}}_{\rm{2}}}\)

(B)\({{\rm{H}}_{\rm{2}}}{\rm{O}}\, \to {\rm{NADPH}}\, \to {\rm{Calvin}}\,{\rm{Cycle}}\)

(C)\({{\rm{H}}_{\rm{2}}}{\rm{O}}\, \to {\rm{photosystem}}\,{\rm{I}}\, \to {\rm{photosystem}}\,{\rm{II}}\)

(D)\({\rm{NADPH}}\, \to {\rm{electron transport chain }} \to {{\rm{O}}_{\rm{2}}}\)

Short Answer

Expert verified
  1. The option 鈥淺({\rm{NADPH}}\, \to {{\rm{O}}_{\rm{2}}} \to {\rm{C}}{{\rm{O}}_{\rm{2}}}\)鈥� is false.
  2. The option 鈥淺({{\rm{H}}_{\rm{2}}}{\rm{O}}\, \to {\rm{NADPH}}\, \to {\rm{Calvin}}\,{\rm{Cycle}}\)鈥� is true.
  3. The option 鈥淺({{\rm{H}}_{\rm{2}}}{\rm{O}}\, \to {\rm{photosystem}}\,{\rm{I}}\, \to {\rm{photosystem}}\,{\rm{II}}\)鈥� is false.
  4. The option 鈥淺({\rm{NADPH}}\, \to {\rm{electron transport chain }} \to {{\rm{O}}_{\rm{2}}}\)鈥� isfalse.

Step by step solution

01

Flow of electrons during photosynthesis

During photosynthesis, solar radiation splits water molecules to release an electron. The released electron flows to PSII, followed by PSI, from where it goes to NADP+to reduce it to NADPH. NADPH then enters the Calvin cycle.

02

Explanation of option (A)

Photolysis occurs in the light reaction of photosynthesis, during which solar radiation splits the water (H2O) molecule into oxygen molecules, protons, and electrons. The electrons and protons then flow to NADP+and reduce it to NADPH.

Thus, the electrons do not flow from NADPH to oxygen.

Therefore, the given option is false.

03

Explanation of option (B)

PSII picks the electrons released during photolysis. From here, it passes through a series of electron carriers, and then PSI picks it up. The electrons then go to NADP+, which combines with protons to produce NADPH.

NADPH synthesized in light reaction then goes to Calvin cycle, used to synthesize the organic compound.

Thus, theelectrons flow from water to NADPH, from where it flows to the Calvin cycle.

Therefore, the given option is true.

04

Explanation of option (C)

Electrons released during photolysis of water flow toward PSII, from where they flow toward PSI through a series of electron carriers.

Thus, electrons flow from PSII to PSI, not from PSI to PSII.

Therefore, the given option is false.

05

Explanation of option (D)

The splitting of water produces oxygen gas, and the electrons are released to pass through the electron transport chain before giving it to NADP+ to form NADPH.

Thus, electrons flow from the electron transport chain to NADPH, not NADPH to the electron transport chain.

Therefore, the given option is false.

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Most popular questions from this chapter

To synthesize one glucose molecule, the Calvin cycle uses __________molecules of CO2, _________molecules of ATP, and ________molecules of NADPH.

The presence of only PSI, not PSII, in the bundle-sheath cells of C4 plants has an effect on O2 concentration. What is that effect, and how might that benefit the plant?

Draw a 鈥渂est fit鈥� line for each set of points. A best-fit does not necessarily pass through all or even most points. Instead, it is a straight line that passes as close as possible to all data points from that set. Draw a best-fit line for each set of data. Because the placement of the line is a matter of judgment, two individuals may draw slightly different lines for a given set of points. The line that actually fits best, a regression line, can be identified by squaring the distances of all points to any candidate line, then selecting the line that minimizes the sum of the squares. (See the graph in the scientific skills Exercise in Chapter 3) for an example of a linear regression line. Excel or other software programs, including those on a graphical calculator, can plot regression lines once data points are entered. Using either Excel or a graphical calculator, enter the data points for each data set and have the program draw the two regression lines. Compare them to the lines drawn.

How do the CO2molecules used in photosynthesis reach and enter the chloroplasts inside the leaf cell? (See Concept 7.2)

In the light reactions, what is the initial electron donor? Where do the electrons finally end up?
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