Question

Dark reactions occur only in absence of light.

• A. True
• B. False

Answer 1

The correct option is A True

Dark reaction:

1. Photosynthesis involved the production of organic substances in the presence of light with the help of chlorophyll and inorganic substances.
2. The process of photosynthesis is divided into two phases: light and dark reactions.
3. Dark reaction:

• The dark reaction occurs in the stroma.
• In this reaction, 6 molecules of carbon dioxide are converted to glucose through the Calvin-Benson cycle.
• The enzyme mediating this process is produced in the stroma itself which can only work in the absence of light.
• Therefore, this reaction takes place in the complete absence of light.
• The enzyme Rubisco aids the fixation of carbon dioxide into glucose.
• The energy is retained from ATP produced during light reactions.

Final answer: The given statement is true.