In C3 plants the conservation of water promotes:<\/p>\n\n\n\n
photorespiration
photosynthesis
a shift to C4 photosynthesis
the light reactions
the opening of stomata<\/p>\n\n\n\n
The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n Correct Answer: Photorespiration<\/strong><\/p>\n\n\n\n In C3 plants<\/strong>, the primary enzyme responsible for carbon fixation during the Calvin cycle is RuBisCO<\/strong> (Ribulose-1,5-bisphosphate carboxylase\/oxygenase). This enzyme can bind to both carbon dioxide (CO\u2082)<\/strong> and oxygen (O\u2082)<\/strong>. Under optimal conditions\u2014such as cool temperatures and adequate water\u2014RuBisCO preferentially binds to CO\u2082, enabling efficient photosynthesis.<\/p>\n\n\n\n However, when water conservation becomes critical<\/strong>, such as in hot or dry conditions<\/strong>, C3 plants respond by closing their stomata<\/strong> to reduce water loss. While this is essential for preventing dehydration, it has a negative impact on gas exchange: CO\u2082 cannot enter the leaf, and O\u2082 cannot leave<\/strong>. As a result, the internal CO\u2082 concentration decreases<\/strong> while O\u2082 levels increase<\/strong> within the leaf tissue.<\/p>\n\n\n\n Under these conditions, RuBisCO is more likely to fix O\u2082 instead of CO\u2082, initiating a process called photorespiration<\/strong>. Unlike photosynthesis, photorespiration does not produce glucose<\/strong> and instead consumes energy (ATP) and releases fixed carbon as CO\u2082<\/strong>, making it an inefficient process for the plant. Essentially, photorespiration is a wasteful pathway<\/strong> that occurs when RuBisCO acts as an oxygenase rather than a carboxylase.<\/p>\n\n\n\n So, in C3 plants, water conservation (via stomatal closure)<\/strong> promotes photorespiration<\/strong> due to the altered ratio of CO\u2082 to O\u2082 within the leaf.<\/p>\n\n\n\n Conclusion:<\/strong> In C3 plants, conserving water by closing stomata leads to photorespiration<\/strong> due to reduced CO\u2082 availability and increased O\u2082 concentration inside the leaf.<\/p>\n","protected":false},"excerpt":{"rendered":" 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 primary enzyme responsible for carbon fixation during the Calvin cycle is RuBisCO (Ribulose-1,5-bisphosphate carboxylase\/oxygenase). This enzyme can bind to both carbon dioxide (CO\u2082) […]<\/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-215878","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/215878","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=215878"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/215878\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=215878"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=215878"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=215878"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n\n\n\nExplanation:<\/strong><\/h3>\n\n\n\n
\n\n\n\nOther Options Explained:<\/strong><\/h3>\n\n\n\n
\n\n\n\n