Science Que:-Give changes that occur during photosynthesis
Answers
Explanation:
) In this phase, light plays a key role. A series of chemical reactions occur in very quick succession, initiated by light and therefore, the phase is called the photochemical phase.
The light reaction occurs in two main steps.
Step 1:- Activation of chlorophyll. The chlorophyll on exposure to light energy becomes activated by absorbing photons.
Step 2:- Splitting of water. The absorbed energy is used in splitting the water molecule (H2O) into its two components (Hydrogen and Oxygen) and releasing electrons.
2H2Oenergy of 4 photons4H++4e−+O2
The reaction is known as photolysis.
(a) The hydrogen ions (H+) are picked up by a compound NADP (Nicotinamide adenine dinucleotide phosphate) to form NADPH.
NADP++e−+H+enzymeNADPH
(b) The oxygen (O) component is given out as molecular oxygen (O2).
2O→O2.
(C) The electrons (e−) are used in converting ADP (adenosine diphosphate) into energy-rich compound ATP (adenosine triphosphate) by adding one phosphate group Pi (inorganic phosphate)
ADP+Phosphate→ATP
(Inorganic)
(ii) The reaction is the phase do not require light energy and occur simultaneously with the light reaction (time gap between the two being less than even one-thousandth of a second)
The dark reaction takes place in three major steps:
1. Carboxylation: RuBP is carboxylated to 3-phosphoglycerate.(12 molecules)
2. Reduction: Phosphoglycerate is reduced to Glyceraldehyde - 3- phosphate (12 molecules)
3. 2 molecules of Glyceraldehyde - 3- phosphate forms glucose
4. Regeneration: 10 molecules of Glyceraldehyde - 3-phosphate is used for regenerating RuBP molecules.
Answer:
the process by which green plants and certain other organism transform light energy into chemical energy.
during photosynthesis in green plants light energy is capture to convert water carbon dioxide and minerals into oxygen and energy rich oxygen compound
Explanation:
hope it helps