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 In C3 plants the conservation of water promotes:<\/p>\n\n\n\n Correct Answer: Photorespiration<\/strong><\/p>\n\n\n\n In C3 plants<\/strong>, the conservation of water is primarily achieved by closing their stomata<\/strong>, which are small openings on the leaf surface that regulate gas exchange. When water is scarce, plants close these stomata to reduce water loss through transpiration. However, this protective mechanism has a significant consequence: it limits the intake of carbon dioxide (CO\u2082)<\/strong> while allowing oxygen (O\u2082)<\/strong> to accumulate inside the leaf.<\/p>\n\n\n\n C3 plants are named for the three-carbon compound (3-phosphoglycerate) produced in the first step of the Calvin cycle. The enzyme RuBisCO (ribulose-1,5-bisphosphate carboxylase\/oxygenase)<\/strong> is responsible for fixing CO\u2082 in the Calvin cycle. However, RuBisCO is not entirely specific to CO\u2082\u2014it can also bind to O\u2082. When CO\u2082 levels drop (due to closed stomata) and O\u2082 levels rise inside the leaf, RuBisCO begins to catalyze a wasteful reaction with O\u2082 instead of CO\u2082. This process is called photorespiration<\/strong>.<\/p>\n\n\n\n Photorespiration results in the production of phosphoglycolate<\/strong>, which cannot be used in the Calvin cycle and must be recycled through a complex pathway that consumes ATP and releases CO\u2082\u2014essentially undoing the work of photosynthesis. Thus, instead of producing sugars, the plant loses fixed carbon and energy<\/strong>, making photorespiration inefficient and detrimental to the plant’s productivity.<\/p>\n\n\n\n Therefore, under conditions where water conservation is necessary (e.g., hot, dry climates), C3 plants suffer from increased rates of photorespiration due to the reduction in internal CO\u2082 concentration. This explains why some plants have evolved the C4 pathway<\/strong> (like corn and sugarcane), which minimizes photorespiration by spatially separating carbon fixation from the Calvin cycle.<\/p>\n\n\n\n To summarize, in C3 plants, conserving water leads to stomatal closure<\/strong>, which decreases CO\u2082 availability and increases O\u2082 concentration inside the leaf, thereby promoting photorespiration<\/strong>.<\/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 In C3 plants the conservation of water promotes: Correct Answer: Photorespiration Explanation: In C3 plants, the conservation of water is primarily achieved by closing their stomata, which are small openings on […]<\/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-211176","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/211176","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=211176"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/211176\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=211176"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=211176"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=211176"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n\n\n\nExplanation:<\/h3>\n\n\n\n