DENDROLOGY

TREE PHYSIOLOGY

PHOTOSYNTHESIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
After electrons get excited by light a second time (at photosystem I), where do they go?
A
They travel down a second electron transport chain and are donated to ADP, which is then converted to ATP.
B
They remain excited and then travel to photosystem II where they get even more excited until they spontaneously combust.
C
They travel down a second electron transport chain and are donated to NADP+ which becomes NADPH (an electron carrier).
D
They travel down a second electron transport chain and are donated to oxygen which then bonds to hydrogen ions to form water.
Explanation: 

Detailed explanation-1: -Photosystem I (PSI) is also capable of absorbing light energy. Electrons from its reaction center pigment P700 are transferred to the protein ferredoxin, which can then donate the electrons to the electron carrier NADP+ to form NADPH or to the electron transport chain resulting in the production of additional ATP.

Detailed explanation-2: -After electrons get excited by light a second time (at photosystem I), where do they go? They travel down a second electron transport chain and are donated to ADP, which is then converted to ATP.

Detailed explanation-3: -After the photon hits, photosystem II transfers the free electron to the first in a series of proteins inside the thylakoid membrane called the electron transport chain.

Detailed explanation-4: -A photon strikes photosystem II to initiate photosynthesis. Energy travels through the electron transport chain, which pumps hydrogen ions into the thylakoid space. This forms an electrochemical gradient.

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