Light-dependent reactions: is matched with B-thylakoids.
The thylakoid is a set of membranes present in cyanobacteria and in chloroplasts where the photochemical (or clear) phase of photosynthesis takes place.
The light-dependent reactions take place in the membranes of chloroplast thylakoids (grana), where chlorophyll molecules with other pigments and proteins form photosystem I and photosystem II.
Light-independent reactions: is matched with A- stroma.
The stroma, zone filled with liquid and optically empty of a chloroplast on the outside of thylakoid membranes where the independent reactions of light (Calvin cycle and carbon fixation) of photosynthesis occur,
The independent reactions of light take place in the stroma of chloroplasts and these reactions form the Calvin cycle. Light is essential for lumino-dependent reactions, but not for lumino-independent reactions.
Sun’s energy absorbed: is matched with B-thylakoids.
Initially, light energy excites electrons from the chlorophyll molecules of photosystem II. Some of their energy is used for photolysis of water. This allows the creation of molecular oxygen (O2) and releases electrons and H + ions.
The released electrons are transferred to photosystem I, but the H + ions remain in the thylakoid cavity. The electrons of chlorophyll molecules in photosystem I are also excited by light energy.
Some of these electrons pass into the NADP molecules that take in addition the H + ions and form the NADPH2, these molecules are used in the independent reactions of light.
At the same time as the electron flux from photosystem II to photosystem I, an additional influx of H + ions to the inner side of the thylakoid membrane is observed. This influx leads to a higher concentration of H + ions on the inner surface of the membrane relative to the outer membrane. The flow of H + ions returns to the outer side of the membrane passing through an enzyme - ATP.
Sugars produced: is matched with A- stroma.
The CO2 molecules and the products of the lumino-dependent reactions - NADPH2 and ATP - are useful for the Calvin cycle reactions. Glucose molecules are synthesized following this process.
The summary equation for this process is: 6 CO2 + 6 H2O → C6H12O6 + 6 O2.