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Chapter 10: Q1TYU (page 187)

The light reactions of photosynthesis supply the Calvin cycle with

  1. light energy.
  2. CO2and ATP.
  3. H2O and NADPH.
  4. ATP and NADPH.

Short Answer

Expert verified
  1. The option 鈥渓ight energy鈥� is false.
  2. The option 鈥淐O2and ATP鈥� is false.
  3. The option 鈥淗2O and NADPH鈥� is false.
  4. The option 鈥淎TP and NADPH鈥漣strue.

Step by step solution

01

Photosynthesis

The process by which photosynthetic organisms convert the sun鈥檚 light energy to chemical energy is referred to as photosynthesis. Light reaction and Calvin cycle are two phases in which photosynthesis occurs.

02

Explanation of option (A)

Light energy is the solar radiation of the sun.

Thus, light energy is provided by the sun and not the light reaction of photosynthesis.

Therefore, the given option is false.

03

Explanation of option (B)

ATP is produced in the light reaction of photosynthesis, whereas CO2 is obtained from air and is fixed and converted into carbohydrates during the Calvin cycle of photosynthesis.

Thus, light reaction provides ATP to the Calvin cycle but not CO2.

Therefore, the given option is false.

04

Explanation of option (C)

H2O splits to produce oxygen molecules during photosynthesis, whereas NADPH is produced during light reactions.

Thus, light reaction provides NADPH but not water to the Calvin cycle.

Therefore, the given option is false.

05

Explanation of option (D)

During the light reaction of photosynthesis, chlorophyll present in chloroplasts absorbs solar radiation and converts it into chemical energy in ATP and NADPH.

Thus, light reaction provides both ATP and NADPH to the Calvin cycle.

Therefore, the given option is true.

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Most popular questions from this chapter

To explore the relationship between the two variables, it is useful to graph the data in a scatter plot and then draw a regression line. (a) First, place the labels for the dependent and independent variables on the appropriate axes. Explain your choices. (b) Now plot the data points for corn and velvet left using a different symbol for each set of data, and add a key for the two symbols. (For additional information about graphs, see the Scientific Skills Review in Appendix F.)

Review Figures 9.9 and 10.19. Discuss the roles of intermediate and product played by glyceraldehydes 3-phosphate (G3P) in the two processes shown in these two figures.

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

Describe how photorespiration lowers photosynthetic output for plants.

Can plants use the sugar they produce during photosynthesis to directly power the work of the cell? Explain. (See figures 8.10,8.11, and 9.6).
See all solutions

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