{"id":208631,"date":"2025-04-27T20:28:45","date_gmt":"2025-04-27T20:28:45","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=208631"},"modified":"2025-04-27T20:28:47","modified_gmt":"2025-04-27T20:28:47","slug":"thylakoids-are-arranged-in-stacks-called","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/04\/27\/thylakoids-are-arranged-in-stacks-called\/","title":{"rendered":"Thylakoids are arranged in stacks called"},"content":{"rendered":"\n<p>Thylakoids are arranged in stacks called<\/p>\n\n\n\n<p>A) cristae.<br>B) stomata.<br>C) grana.<br>D) vacuoles.<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>The correct answer is: <strong>C) grana<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Explanation:<\/strong><\/p>\n\n\n\n<p>In plant cells, photosynthesis occurs in organelles called <strong>chloroplasts<\/strong>. Within chloroplasts, there are specialized internal structures known as <strong>thylakoids<\/strong>. Thylakoids are flattened, sac-like membranes that contain chlorophyll and other pigments essential for capturing light energy.<\/p>\n\n\n\n<p>These thylakoid membranes are organized into <strong>stacks<\/strong> called <strong>grana<\/strong> (singular: granum). Each granum looks like a stack of coins when viewed under a microscope. The grana are connected to each other by structures called <strong>stroma thylakoids<\/strong> or <strong>lamellae<\/strong>, which are unstacked regions of thylakoid membrane.<\/p>\n\n\n\n<p>The main role of the grana is to optimize the surface area available for light-dependent reactions of photosynthesis. Within the thylakoid membranes, sunlight is captured by chlorophyll and other pigments, initiating a chain of chemical reactions that lead to the production of energy-rich molecules like <strong>ATP<\/strong> and <strong>NADPH<\/strong>. These energy carriers are then used in the Calvin cycle, which happens in the surrounding fluid called the <strong>stroma<\/strong>, to produce glucose.<\/p>\n\n\n\n<p>Let&#8217;s briefly look at the incorrect options:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A) Cristae<\/strong>: These are folds found inside mitochondria, not chloroplasts. They increase the surface area for cellular respiration.<\/li>\n\n\n\n<li><strong>B) Stomata<\/strong>: These are pores on the surface of leaves that allow for gas exchange (CO\u2082 in, O\u2082 out).<\/li>\n\n\n\n<li><strong>D) Vacuoles<\/strong>: These are storage structures within cells, mainly for water, nutrients, and waste products.<\/li>\n<\/ul>\n\n\n\n<p>Thus, thylakoids being stacked into <strong>grana<\/strong> is crucial for efficient photosynthesis, making <strong>C) grana<\/strong> the correct answer.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thylakoids are arranged in stacks called A) cristae.B) stomata.C) grana.D) vacuoles. The correct answer and explanation is : The correct answer is: C) grana. Explanation: In plant cells, photosynthesis occurs in organelles called chloroplasts. Within chloroplasts, there are specialized internal structures known as thylakoids. Thylakoids are flattened, sac-like membranes that contain chlorophyll and other pigments [&hellip;]<\/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-208631","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/208631","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=208631"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/208631\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=208631"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=208631"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=208631"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}