{"id":220937,"date":"2025-05-29T04:12:00","date_gmt":"2025-05-29T04:12:00","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=220937"},"modified":"2025-05-29T04:12:03","modified_gmt":"2025-05-29T04:12:03","slug":"in-c3-plants-the-conservation-of-water-promotes-18","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/29\/in-c3-plants-the-conservation-of-water-promotes-18\/","title":{"rendered":"In C3 plants the conservation of water promotes"},"content":{"rendered":"\n<p>In C3 plants the conservation of water promotes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>photorespiration<\/li>\n\n\n\n<li>photosynthesis<\/li>\n\n\n\n<li>a shift to C4 photosynthesis<\/li>\n\n\n\n<li>the light reactions<\/li>\n\n\n\n<li>the opening of stomata<\/li>\n<\/ul>\n\n\n\n<p><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><strong>Correct Answer:<\/strong> <strong>Photorespiration<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Explanation<\/strong><\/p>\n\n\n\n<p>In <strong>C3 plants<\/strong>, the conservation of water primarily <strong>promotes photorespiration<\/strong>, a process that can reduce the efficiency of photosynthesis. This outcome is rooted in the physiological adaptations of C3 plants, which differ from those of C4 and CAM plants.<\/p>\n\n\n\n<p>C3 plants carry out photosynthesis using the Calvin cycle, where the enzyme <strong>RuBisCO<\/strong> (Ribulose-1,5-bisphosphate carboxylase\/oxygenase) fixes atmospheric <strong>CO\u2082<\/strong> into a 3-carbon compound, 3-phosphoglycerate (3-PGA). RuBisCO, however, has a dual affinity \u2014 it can also bind to <strong>O\u2082<\/strong>, especially when <strong>CO\u2082 concentrations are low<\/strong>.<\/p>\n\n\n\n<p>When water conservation becomes necessary, especially under hot or dry conditions, C3 plants <strong>close their stomata<\/strong> to reduce water loss through transpiration. This closure reduces the influx of CO\u2082 while O\u2082 continues to accumulate due to ongoing light reactions. The resulting <strong>low CO\u2082:O\u2082 ratio<\/strong> inside the leaf favors the oxygenase activity of RuBisCO. Instead of fixing CO\u2082, RuBisCO binds O\u2082 and initiates <strong>photorespiration<\/strong>, a process where oxygen is consumed and carbon dioxide is released without producing ATP or sugars.<\/p>\n\n\n\n<p>Photorespiration is generally considered <strong>wasteful<\/strong>, as it counteracts the benefits of photosynthesis. It consumes energy and leads to the <strong>loss of fixed carbon<\/strong>, reducing the plant\u2019s overall productivity. C4 and CAM plants have evolved mechanisms to minimize photorespiration, but C3 plants do not have these adaptations.<\/p>\n\n\n\n<p>To summarize, when C3 plants conserve water by <strong>closing stomata<\/strong>, they inadvertently create internal conditions (low CO\u2082, high O\u2082) that <strong>promote photorespiration<\/strong>. While this may help the plant survive drought conditions, it does so at the cost of photosynthetic efficiency.<\/p>\n\n\n\n<p>Therefore, the <strong>correct answer is &#8220;photorespiration&#8221;<\/strong> \u2014 it is the process that is promoted in C3 plants when water conservation leads to stomatal closure.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/05\/learnexams-banner4-86.jpeg\" alt=\"\" class=\"wp-image-220938\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>In C3 plants the conservation of water promotes: The Correct Answer and Explanation is: Correct Answer: Photorespiration Explanation In C3 plants, the conservation of water primarily promotes photorespiration, a process that can reduce the efficiency of photosynthesis. This outcome is rooted in the physiological adaptations of C3 plants, which differ from those of C4 and [&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-220937","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/220937","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=220937"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/220937\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=220937"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=220937"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=220937"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}