Question

Select the correct option
A dark reaction in photosynthesis is called so because
A. It can occur in dark also
B. It does not directly depend on light energy
C. It cannot occur during daylight
D. It occurs more rapidly at night

Answer 1

Hint: A process carried out by plants and few organisms that makes use of carbon dioxide, sunlight, and water to prepare food is called photosynthesis. The process of photosynthesis is carried out by autotrophs which prepare their own food and do not feed on another microorganism. Conversion of carbon dioxide and other compounds into glucose is involved in the process of dark reaction in photosynthesis.

Complete answer:
Dark reaction of photosynthesis is also called Calvin cycle or light-independent reaction or C$_3$ cycle. The site of the dark reaction in the stroma of the chloroplast. These reactions make use of the products formed in the light reaction for regulating their function. This reaction occurs in almost all plants. C$_3$ plants tend to grow in areas where the intensity of sunlight is moderate. Therefore, the dark reaction in photosynthesis is called so because It does not directly depend on light energy

So, option B is the correct option.

Additional information:
The process which involves the conversion of inorganic carbon into organic compounds by the living organism is called carbon fixation. The process of carbon fixation is involved in the photosynthesis process. C$_3$ plants tend to survive by C$_3$ carbon fixation. It is one of the metabolic pathways of photosynthesis. This process involves the conversion of carbon dioxide and ribulose phosphate into two molecules of 3-phosphoglycerate.

Note: C$_3$ plants are also called temperate plants and are also referred to as light-independent reactions in the process of photosynthesis. This is because they use the ATP and NADPH formed in the light-dependent reaction for their further chemical reaction. The C$_3$ pathway is also called the Calvin cycle and the C$_4$ pathway is also called the Hatch-Slack pathway.