{"id":219326,"date":"2025-05-26T03:49:08","date_gmt":"2025-05-26T03:49:08","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=219326"},"modified":"2025-05-26T03:49:10","modified_gmt":"2025-05-26T03:49:10","slug":"in-c3-plants-the-conservation-of-water-promotes-17","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/26\/in-c3-plants-the-conservation-of-water-promotes-17\/","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:<\/mark><\/strong><\/p>\n\n\n\n

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

\n\n\n\n

Explanation<\/h3>\n\n\n\n

In C3 plants<\/strong>, the conservation of water often leads to photorespiration<\/strong>, a process that is generally wasteful for the plant. This occurs primarily due to the closure of stomata<\/strong> under hot and dry conditions, which plants do to reduce water loss through transpiration.<\/p>\n\n\n\n

Stomata are tiny openings on the leaves that allow for gas exchange\u2014CO\u2082 enters<\/strong>, and O\u2082 and water vapor exit<\/strong>. When the plant experiences water stress, it closes its stomata to conserve moisture. However, this also limits the intake of carbon dioxide (CO\u2082)<\/strong>, which is essential for the Calvin cycle<\/strong> in photosynthesis.<\/p>\n\n\n\n

As CO\u2082 becomes limited inside the leaf, the concentration of oxygen (O\u2082)<\/strong> increases because it continues to be produced during the light-dependent reactions of photosynthesis. The enzyme RuBisCO<\/strong>, which normally fixes CO\u2082 to start the Calvin cycle, starts binding O\u2082 instead of CO\u2082<\/strong> due to the higher oxygen concentration. This alternative pathway is known as photorespiration<\/strong>.<\/p>\n\n\n\n

Unlike normal photosynthesis, photorespiration does not produce sugars<\/strong>. Instead, it uses energy and releases CO\u2082<\/strong>, making it a counterproductive process for the plant. It is considered a metabolic flaw<\/strong> in C3 plants, particularly under stress conditions like drought or high temperatures.<\/p>\n\n\n\n

C3 plants, named for the 3-carbon compound (3-phosphoglycerate) formed during the first step of the Calvin cycle, are the most common type of plants. However, under conditions favoring photorespiration, they become less efficient.<\/p>\n\n\n\n

This is one of the reasons C4 plants<\/strong> evolved. They have a specialized mechanism to minimize photorespiration by spatially separating the initial CO\u2082 fixation and the Calvin cycle, thus maintaining high CO\u2082 levels around RuBisCO.<\/p>\n\n\n\n

In summary, when water conservation leads to stomatal closure in C3 plants, photorespiration is promoted<\/strong> due to reduced CO\u2082 and increased O\u2082 inside the leaf, making this the correct answer.<\/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 often leads to photorespiration, a process that is generally wasteful for the plant. This occurs primarily due to the closure […]<\/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-219326","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/219326","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=219326"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/219326\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=219326"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=219326"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=219326"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}