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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

One aspect of climate change is that average night-time temperatures have increased more than average daytime temperatures have increased. Since the rates of metabolic processes, including photosynthesis and cellular respiration, depend on temperature, how might climate change affect plant growth?

The 鈥渞ed tide鈥� is a massive proliferation of certain algal species that causes seawater to become visibly red. Describe the spectral characteristics of the dominant photosynthetic pigments in the algae.

The leaves of some species of desert plants taste sour in the early morning, but, as the day wears on, they become tasteless and then bitter. Explain.

The net equation for oxidative phosphorylation can be written as

2NADH + 2H+ + O2 鈫� 2H2O + 2NAD+

Write an analogous equation for the light reactions of photosynthesis.

How many moles of ATP could theoretically be synthesized under standard conditions using the energy of the photons in Problem 5?
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