{"id":217492,"date":"2025-05-22T04:11:38","date_gmt":"2025-05-22T04:11:38","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=217492"},"modified":"2025-05-22T04:11:41","modified_gmt":"2025-05-22T04:11:41","slug":"in-c3-plants-the-conservation-of-water-promotes-16","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/22\/in-c3-plants-the-conservation-of-water-promotes-16\/","title":{"rendered":"In C3 plants the conservation of water promotes"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">In C3 plants the conservation of water promotes:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">photorespiration<br>photosynthesis<br>a shift to C4 photosynthesis<br>the light reactions<br>the opening of stomata<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Correct Answer: Photorespiration<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In <strong>C3 plants<\/strong>, the conservation of water typically involves the <strong>closing of stomata<\/strong> to reduce water loss through transpiration. While this is beneficial in preventing dehydration, it has a <strong>significant impact on photosynthesis<\/strong> and leads to an increase in <strong>photorespiration<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">C3 Photosynthesis Overview:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">C3 plants, such as wheat and rice, use the <strong>Calvin cycle<\/strong> for carbon fixation, where the enzyme <strong>RuBisCO<\/strong> fixes carbon dioxide (CO\u2082) into a three-carbon compound (3-phosphoglycerate). Under normal conditions, RuBisCO uses CO\u2082 efficiently. However, it can also bind to oxygen (O\u2082), especially when CO\u2082 levels inside the leaf drop \u2014 which happens when <strong>stomata close to conserve water<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">What Happens When Stomata Close:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CO\u2082 levels inside the leaf decrease.<\/strong><\/li>\n\n\n\n<li><strong>O\u2082 levels increase<\/strong> due to ongoing light reactions producing O\u2082.<\/li>\n\n\n\n<li><strong>RuBisCO begins to bind more O\u2082 than CO\u2082<\/strong>, initiating <strong>photorespiration<\/strong>.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Photorespiration:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Photorespiration is a <strong>wasteful process<\/strong> because it uses oxygen and releases previously fixed CO\u2082. It does not produce ATP or sugar, and actually <strong>consumes energy and organic carbon<\/strong>, reducing the overall efficiency of photosynthesis.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Why Not the Other Options?<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Photosynthesis<\/strong>: Decreases under water stress due to closed stomata and lower CO\u2082 availability.<\/li>\n\n\n\n<li><strong>A shift to C4 photosynthesis<\/strong>: C3 plants do not shift to C4 photosynthesis; that is a separate evolutionary adaptation seen in plants like corn and sugarcane.<\/li>\n\n\n\n<li><strong>The light reactions<\/strong>: These may continue under sunlight, but without sufficient CO\u2082, the Calvin cycle is limited.<\/li>\n\n\n\n<li><strong>The opening of stomata<\/strong>: Water conservation leads to <strong>closing<\/strong>, not opening, of stomata.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion:<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Thus, <strong>water conservation in C3 plants promotes photorespiration<\/strong>, a process that is generally <strong>counterproductive<\/strong> to efficient carbon fixation and overall photosynthetic productivity.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C3 plants the conservation of water promotes: photorespirationphotosynthesisa shift to C4 photosynthesisthe light reactionsthe opening of stomata The Correct Answer and Explanation is: Correct Answer: Photorespiration Explanation: In C3 plants, the conservation of water typically involves the closing of stomata to reduce water loss through transpiration. While this is beneficial in preventing dehydration, it [&hellip;]<\/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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-217492","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/217492","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=217492"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/217492\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=217492"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=217492"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=217492"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}