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 process of conserving water<\/strong>\u2014which typically involves closing the stomata<\/strong>\u2014leads to photorespiration<\/strong>, not increased photosynthesis or a shift to C4 photosynthesis.<\/p>\n\n\n\n Stomata are tiny openings on the surfaces of leaves that allow for gas exchange. During photosynthesis<\/strong>, stomata open to let in carbon dioxide (CO\u2082)<\/strong> and release oxygen (O\u2082)<\/strong>. However, open stomata also allow water vapor<\/strong> to escape through transpiration<\/strong>. In hot or dry conditions, plants often close their stomata to conserve water.<\/p>\n\n\n\n When stomata are closed:<\/p>\n\n\n\n This change in gas concentrations inside the leaf causes Rubisco<\/strong>, the key enzyme of the Calvin cycle, to start fixing oxygen<\/strong> instead of carbon dioxide<\/strong>. This leads to a process called photorespiration<\/strong>.<\/p>\n\n\n\n Photorespiration is a wasteful pathway that occurs when Rubisco reacts with O\u2082<\/strong> instead of CO\u2082. This process consumes energy (ATP and NADPH) and releases fixed carbon<\/strong> as CO\u2082, reducing the overall efficiency of photosynthesis. Photorespiration does not<\/strong> produce sugars like normal photosynthesis does.<\/p>\n\n\n\n C3 plants are genetically and structurally different from C4 plants<\/strong>, which have specialized anatomy (Kranz anatomy) and a different biochemical pathway that minimizes photorespiration. A C3 plant cannot simply “shift” to C4 photosynthesis; this is a trait that evolved separately.<\/p>\n\n\n\n So, in C3 plants<\/strong>, when water conservation causes stomata to close, the reduction in internal CO\u2082 levels leads to increased photorespiration<\/strong>\u2014not better photosynthesis, not light reactions, and not stomatal opening. Therefore, photorespiration<\/strong> is the correct answer.<\/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 process of conserving water\u2014which typically involves closing the stomata\u2014leads to photorespiration, not increased photosynthesis or a shift to C4 photosynthesis. Understanding Stomatal Function: […]<\/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-217459","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/217459","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=217459"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/217459\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=217459"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=217459"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=217459"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Explanation:<\/h3>\n\n\n\n
Understanding Stomatal Function:<\/h4>\n\n\n\n
What Happens When Stomata Close?<\/h4>\n\n\n\n
\n
What is Photorespiration?<\/h4>\n\n\n\n
Why Not a Shift to C4 Photosynthesis?<\/h4>\n\n\n\n
Summary:<\/h4>\n\n\n\n