Question

Light phase consists of,
A) Two photochemical reactions
B) Two photosynthetic reactions
C) Two chloroplast parts
D) None of the above

Answer 1

Hint: The photosynthesis is the process by which all the green plants and the other photosynthetic organism converts the light energy into the chemical energy. During this process, the plants absorb the sunlight, and with the help of water and the carbon dioxide, produce oxygen and energy-yielding organic compounds such as glucose.
The light reaction is the first stage of photosynthesis which uses light energy to produce ATP and NADPH.

Complete Answer:
- The light reaction is the first stage of photosynthesis that absorbs the light and produces ATP and NADPH, while in the dark phase that is the second step that utilizes these products to produce the glucose.
- Glucose is the final product of photosynthesis. Two photosynthetic units involved in the light phase of photosynthesis are Photosystem I and Photosystem II. Both ATP and NADPH are produced during the different stages of cellular respiration.

So, the ‘Two photosynthetic reactions’ is the correct answer.

Additional information: The light phase is followed by the dark phase which does not require the presence of light.

Note: ATP stands for adenosine triphosphate while the acronym of NADPH is nicotinamide adenine dinucleotide phosphate. ATP is also called the energy currency of a cell. The energy requirement of a cell to fulfill any task is provided by ATP.