Correct Answer: c) Chloroplast ATP synthase releases ATP into the thylakoid space<\/strong><\/p>\n\n\n\n Photosynthesis is a complex process that occurs in the chloroplasts of plant cells, primarily involving the light-dependent reactions within the thylakoid membranes. Let\u2019s examine each statement:<\/p>\n\n\n\n a) Photosystem II has a higher redox potential than water \u2013 FALSE<\/strong> b) Plastocyanin donates its electrons to photosystem I \u2013 TRUE<\/strong> c) Chloroplast ATP synthase releases ATP into the thylakoid space \u2013 FALSE<\/strong> d) Water-splitting enzyme releases four protons into the thylakoid space for every water molecule split \u2013 TRUE<\/strong> e) Cytochrome b6-f complex pumps protons into the thylakoid space \u2013 TRUE<\/strong> Therefore, the FALSE statement is option (c).<\/strong><\/p>\n\n\n\n Question:- Which of the following statements about photosynthesis are FALSE? \u00c3\u201a\u00c2 a) Photosystem II has a higher redox potential than water. \u00c3\u201a\u00c2 b) Plastocyanin donates its electrons to photosystem I. \u00c3\u201a\u00c2 c) Chloroplast ATP synthase releases ATP into the thylakoid space\u00c3\u201a\u00c2 d) Water-splitting enzyme releases four protons into the thylakoid space for every water molecule […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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\n\n\n\n<\/h3>\n\n\n\n
This statement is true<\/strong>, not false. Photosystem II (PSII) must have a lower<\/em> (more positive) redox potential than water in order to oxidize it. In redox chemistry, a molecule with a higher redox potential accepts electrons more readily. Thus, PSII can extract electrons from water because it has a higher (more positive) redox potential than water.<\/p>\n\n\n\n
This is a true statement. Plastocyanin is a copper-containing electron carrier that transfers electrons from the cytochrome b6-f complex to Photosystem I (PSI) during the light reactions.<\/p>\n\n\n\n
This is the false<\/strong> statement and thus the correct answer to the question. Chloroplast ATP synthase synthesizes ATP on the stromal side<\/em> of the thylakoid membrane, not into the thylakoid space. Protons accumulate in the thylakoid lumen, and the resulting proton gradient drives the production of ATP in the stroma where it is used for the Calvin cycle.<\/p>\n\n\n\n
This is correct. The oxygen-evolving complex (part of PSII) splits two water molecules into O\u2082, four protons, and four electrons, releasing the protons into the thylakoid lumen.<\/p>\n\n\n\n
This statement is also true. The cytochrome b6-f complex is part of the electron transport chain and helps maintain the proton gradient by actively pumping protons into the thylakoid lumen.<\/p>\n\n\n\n![\"\"](\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/05\/image-222.png\")
<\/figure>\n","protected":false},"excerpt":{"rendered":"