LABORATORY REVIEW
CELL RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Diffusion of electrons through the thylakoid membrane.
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Reduction of water to produce ATP energy.
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Establishment of a proton gradient across the thylakoid membrane.
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Movement of water by osmosis into the thylakoid space from the stroma.
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Detailed explanation-1: -Assertion :Protons or hydrogen ions produced by photolysis of water accumulate in the lumen of thylakoids. Reason: Photolysis of water takes place in inner membrane of thylakoid.
Detailed explanation-2: -Answer and Explanation: The chemiosmotic process in chloroplasts involves a proton gradient across the thylakoid membrane. During photosynthesis, energy is released as electrons, which are transferred down the electron transport chain. This happens inside of the thylakoid membrane.
Detailed explanation-3: -The chemiosmotic process in chloroplasts stakes place during photosynthesis. The photoexcited electrons move down the ETC on thylakoid membrane. The energy of electron is used to pump proton from stroma into the thylakoid lumen. When the protons move back to stroma, they pass through ATP synthase.
Detailed explanation-4: -The proton gradient is generated due to the accumulation of protons on the inner side of the lumen and a decrease in pH on the lumen side of the thylakoid membrane.
Detailed explanation-5: -Figure 3 Energy from light is used by the chloroplast electron transport chain to pump protons across the thylakoid membrane into the lumen of the thylakoid. This creates a proton gradient that is used as a source of energy by ATP synthase.