NEET BIOLOGY

Detailed explanation-1: -When light is absorbed by one of the pigments in photosystem II, energy is passed inward from pigment to pigment until it reaches the reaction center. There, energy is transferred to P680, boosting an electron to a high energy level (forming P680*).

Detailed explanation-2: -Two of these complexes are photosystems (photosystems I and II), in which light is absorbed and transferred to reaction center chlorophylls. High-energy electrons are then transferred through a series of carriers in both photosystems and in a third protein complex, the cytochrome bf complex.

Detailed explanation-3: -The heart of photosystem II is the reaction center, where the energy of light is converted into the motion of energized electrons. At the center is a key chlorophyll molecule. When it absorbs light, one of its electrons is promoted to a higher energy.

Detailed explanation-4: -Photosystem II (PSII) is a membrane protein supercomplex that executes the initial reaction of photosynthesis in higher plants, algae, and cyanobacteria. It captures the light from the sun to catalyze a transmembrane charge separation.

Detailed explanation-5: -Stage II is called the Calvin cycle or the light-independent reactions because they can take place in the absence of light. This stage combines carbon from carbon dioxide in the air and uses the chemical energy in ATP and NADPH to make glucose. How does carbon dioxide reach the leaf for photosynthesis?