Which of the following processes describe the way excited molecules can return t

Question

Which of the following processes describe the way excited molecules can return to their ground state? 1) They can return via radiationless dissipation of energy. 2) They can lose this energy as a different wavelength of light in a process known as fluorescence. 3) They can transfer this energy to adjacent molecules in a process known as resonance transfer. 4) They can transfer an excited electron to a nearby molecule with a slightly lower excited state in a process known as electron transfer.

Place the following events in the correct order for the two-photosystem light reactions.

1) Electrons are transferred to the b6F complex with concomitant influx of protons into the thylakoid lumen.
2) Electrons are passed through to ferredoxin and then ultimately to NADP+, reducing the latter to NADPH.
3) Electrons are transferred to plastoquinones, which serve as intermediate electron transporters.
4) Light energy is absorbed by photosystem II, placing it in an excited state, causing it to release electrons, which are replaced by the oxidation of water to oxygen.
5) Electrons are transferred to photosystem I via plastocyanin.

Water is oxidized to oxygen at the oxygen-evolving complex of photosystem II and released into the lumen of the thylakoid and diffuses out of the chloroplast.

Water is oxidized to oxygen at the oxygen-evolving complex of photosystem II and released into the lumen of the thylakoid and diffuses out of the chloroplast.

Explanation / Answer

Ques-1: Which of the following processes describe the way excited molecules can return to their ground state?

Answer: 2) They can lose this energy as a different wavelength of light in a process known as fluorescence.

Reason:

Excite state electrons do possess quite unstability and most of electrons are going to lose this energy as a different wavelength of light in a process known as fluorescence or phosphorescence. This energy is emitted in the form of electromagnetic radiation in “cholorophyll a” during Photoelectrochemical process (i.e. during photolysis or photooxidation)

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