Question

g In photosystem II, after pigment molecules donate excited electrons to the reaction center, electrons are taken from ___ to replace them. A. sugar B. water C. sunlight D. carbon dioxide

Answer 1

Excited electrons in photosystem II are replaced by electrons from the splitting of water, which also produces oxygen as a byproduct.

Step-by-step explanation:

In photosystem II, after pigment molecules donate excited electrons to the reaction center, electrons are taken from water to replace them. When the chlorophyll a molecules at the reaction center lose electrons upon excitation, these electrons must be replenished. These replacement electrons come from the splitting of water, a process that also results in the release of oxygen as a waste product.

In photosystem II, after pigment molecules donate excited electrons to the reaction center, electrons are taken from water to replace them. The process of photosystem II involves the absorption of light by chlorophyll molecules in the photosystems, which excite the electrons. These excited electrons are then passed to the primary electron acceptor, and to replace them, electrons are derived from the splitting of water. This process releases oxygen as a waste product.

Answer 2

Answer: B(water)

Step-by-step explanation:

Photosystem II uses energy from light to extract electron from water molecule to fill the hole left as the energized electron passes up the chain.When the electrons are removed from the water molecules,the water molecule breaks down into oxygen gas,which bubbles away, and hydrogen ions,which are used to power ATP synthesis.