PS II Reaction Centre & 680 nm Light — NEET Biology
✅ Asked in NEET 2023In photosystem II the reaction centre chlorophyll a absorbs 680 nm wavelength of red light causing electrons to become excited and jump into an orbit farther from the atomic nucleus. These electrons are picked up by an electron acceptor which passes them to an electrons transport
NEET tests whether students know that Photosystem II's reaction centre chlorophyll a (P680) absorbs 680 nm red light, which excites electrons to higher energy states. These excited electrons are then transferred to an electron acceptor and passed along the electron transport chain. The common mistake is confusing P680 with P700 (PS I's reaction centre), or thinking PS II absorbs different wavelengths. Remember: P680 = 680 nm = PS II; P700 = 700 nm = PS I. This concept is fundamental for understanding light-dependent reactions and energy transfer during photosynthesis.
The reaction centre in PS II has an absorption maxima at (NEET 2023)
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