What are the first stage and second stage of photosynthesis?

Answer 1

two stages of photosynthesis are light reaction ( in sun light ) and dark reaction (do not need sun light ) in light reaction plants traps sonlight ( photons ) and in dark reaction they form cabohydrates

Answer 2

Stage 1: Photo: excited electrons are passed through reaction centre to the primary acceptor and from there are passed through an electron transport chain.

Since electrons are leaving photosystem 680, it becomes defficient and splits water into Hydrogen and oxygen. This is where the oxygen we breathe comes from. (energy lost during transport chain is converted to ATP) Then it reaches photosystem 700. where electrons are also passed through reactino centre to primary acceptor. Electrons are captured and produce NADPH. NADPH and ATP enter stroma

Stage 2: Synthesis: a- CARBON FIXATION - carbon dixoide attaches to RuBP and becomes a 6C carbon that breaks down into 2 PGA

b- REDUCTION- PGA is energized by ATP. Hydrogen and electrons are donated from NADPH. PGAL is formed (which is primarily used to make glucose)

c- REGENERATION - not all PGAL molecules leave, and they are instead used to regenerate more RuBP

Answer 3

The first stage of photosynthesis is the light reactions. This is when light is used to excite electrons in the photosystems and move them through a transport chain. The second stage is the Calvin-Benson cycle. This is where the products of the light reactions (ATP and NADPH) are used to make a complex sugar, usually glucose.