Explain the Dark and Light Phase of Photosynthesis.Explain it for 5 marks
Answers
Answer:
Photosynthesis begins with the light reaction which is carried out only during the day in the presence of sunlight. In plants, the light-dependent reaction takes place in the thylakoid membranes of chloroplasts. The Grana, membrane-bound sacs like structures present inside the thylakoids functions by gathering light and is called as photosystems. These photosystems have large complexes of pigment and proteins molecules present within the plant cells which plays the primary role during the process of light reactions. There are two types of photosystems: photosystem I and photosystem II.
Under the light-dependent reactions, the light energy is converted to ATP and NADPH which are used in the second phase of photosynthesis. During the light reactions, ATP and NADPH are generated by two electron transport chains, water is used and oxygen is produced.
The chemical equation in the light reaction can be reduced to:
2H2O + 2NADP+ + 3ADP + 3Pi → O2 + 2NADPH + 3ATPxplanation:
Answer:light rxn occurs in grana
In light phase includes
Light absorption
Water splitting
Oxygen release
Formation of high energy chemical intermediates, ATP and NADPH
Dark occurs in stroma
Explanation:C3 cycle
C4 cycle
CAM pathway
Photorespiration