{"id":207289,"date":"2025-04-21T12:43:37","date_gmt":"2025-04-21T12:43:37","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=207289"},"modified":"2025-04-21T12:43:40","modified_gmt":"2025-04-21T12:43:40","slug":"in-c3-plants-the-conservation-of-water-promotes-2","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/04\/21\/in-c3-plants-the-conservation-of-water-promotes-2\/","title":{"rendered":"In C3 plants the conservation of water promotes"},"content":{"rendered":"\n

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 :<\/strong><\/mark><\/p>\n\n\n\n

Correct Answer:<\/strong> photorespiration<\/strong><\/p>\n\n\n\n

\n\n\n\n

Explanation:<\/strong><\/p>\n\n\n\n

In C3 plants, the conservation of water primarily promotes photorespiration<\/strong>, which is a process that reduces the efficiency of photosynthesis.<\/p>\n\n\n\n

C3 plants, such as rice, wheat, and barley, rely on the Calvin cycle to fix carbon dioxide (CO\u2082) into organic molecules. The enzyme RuBisCO<\/strong> is responsible for capturing CO\u2082 during this process. However, RuBisCO has a dual affinity\u2014it can bind to oxygen (O\u2082)<\/strong> as well as CO\u2082. When O\u2082 levels are high and CO\u2082 levels are low inside the leaf, RuBisCO begins to fix O\u2082 instead of CO\u2082, leading to photorespiration<\/strong>.<\/p>\n\n\n\n

When water is limited, C3 plants close their stomata<\/strong> to reduce water loss through transpiration. However, this also reduces the inward flow of CO\u2082 and causes CO\u2082 concentration in the leaf to drop, while O\u2082 accumulates due to ongoing light reactions. The altered CO\u2082:O\u2082 ratio favors the oxygenation activity of RuBisCO, which initiates photorespiration. This process uses energy and releases CO\u2082, undoing the work of photosynthesis and decreasing the plant\u2019s productivity<\/strong>.<\/p>\n\n\n\n

Photorespiration is essentially a wasteful pathway from the plant\u2019s perspective, but it’s unavoidable in C3 plants under water stress. Some plants, called C4 plants, have evolved a different photosynthetic mechanism that minimizes photorespiration<\/strong>, but C3 plants do not have this advantage.<\/p>\n\n\n\n

Therefore, in C3 plants, conserving water (by closing stomata) indirectly promotes photorespiration<\/strong> because it limits CO\u2082 availability and enhances O\u2082 binding to RuBisCO. This is one of the major limitations of C3 photosynthesis in hot, dry environments, where water conservation is crucial.<\/p>\n\n\n\n

\"\"<\/figure>\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 conservation of water primarily promotes photorespiration, which is a process that reduces the efficiency of photosynthesis. C3 plants, such as rice, wheat, […]<\/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-207289","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/207289","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=207289"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/207289\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=207289"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=207289"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=207289"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}