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Chapter 19: Q16CP (page 661)

Explain the relationship between the light and dark reactions.

Short Answer

Expert verified

The dark reactions don't occur if the light reactions don't take place.

Step by step solution

01

Definition of photosynthesis

  • Photosynthesis is the foundation of competitive success in green plants.
  • It is the process of creating organic compounds from inorganic raw materials with the help of sunlight.
  • It converts light energy into chemical energy. In chlorophyll, photosynthesis produces carbohydrates by combining water and carbon dioxide.
02

Relationship between the light and dark reactions

  • The light reaction is the first stage in photosynthesis that uses light to produce chemical energy.
  • Adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide phosphate (NADPH) are created as chemical energy molecules.
  • Dark reactions, the next step in photosynthesis, are light-independent reactions that use the energy provided by the molecules produced during light reactions to produce carbohydrate molecules such as glucose.
  • The dark reactions are referred to as the Calvin cycle. It does not necessarily occur in the dark. It can also occur in the presence of light, but it is unaffected by it as it is light-independent.
  • The chloroplast is where these consecutive events take place.
  • In the thylakoid discs, light responses occur.
  • The stroma is where the dark reactions occur.

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Most popular questions from this chapter

Arabidopsis thalianachloroplasts contain a K+channel in the thylakoid stromal lamellae. Propose a function for this channel.

Summarize the events of the light reactions and light-independent reactions.

Chloroplasts are illuminated until the levels of the Calvin cycle intermediates reach a steady state. The light is then turned off. How does the level of RuBP vary after this point?

Calculate the change in free energy for the transit of two electrons from the quinone pool to cytochrome c2 in purple bacterial photosynthetic electron transport. Assume that the reduction potential of cytochromec2is similar to those of other c-type cytochromes.

Describe the effects of an increase in oxygen pressure on the dark reactions of photosynthesis.
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