{"id":4480,"date":"2025-06-18T19:33:20","date_gmt":"2025-06-18T14:03:20","guid":{"rendered":"https:\/\/leverageedu.com\/questions-answers\/?p=4480"},"modified":"2025-06-18T19:33:23","modified_gmt":"2025-06-18T14:03:23","slug":"an-orthotropous-ovule-is-one-in-which-the-micropyle-and-chalaza-are-class-12-biology-cbse","status":"publish","type":"post","link":"https:\/\/leverageedu.com\/questions-answers\/an-orthotropous-ovule-is-one-in-which-the-micropyle-and-chalaza-are-class-12-biology-cbse\/","title":{"rendered":"An Orthotropous Ovule is one in which the Micropyle and Chalaza are"},"content":{"rendered":"\n<p><strong>Answer:<\/strong> An ovule is a structure in flowering plants where fertilisation occurs and seeds develop. It has important parts like:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Micropyle<\/strong> \u2013 small opening for pollen tube entry<\/li>\n\n\n\n<li><strong>Chalaza<\/strong> \u2013 base of the ovule<\/li>\n\n\n\n<li><strong>Funiculus<\/strong> \u2013 stalk that attaches the ovule to the ovary wall<br><\/li>\n<\/ul>\n\n\n\n<p>Depending on how these parts are arranged, ovules are classified as orthotropous, anatropous, hemitropous, campylotropous, or amphitropous. Now, let\u2019s understand and analyse each option and find out the correct answer.<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Option (A) In the straight line of a funiculus<\/strong><\/p>\n\n\n\n<p>In an orthotropous ovule, all major structures, funiculus, chalaza, nucellus, embryo sac, and micropyle, are arranged in one straight line. The ovule is upright and linear, without any curvature. This is a textbook example of the orthotropous arrangement and is the correct option.<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Option (B) Parallel to the funiculus<\/strong><\/p>\n\n\n\n<p>If the micropyle and chalaza are parallel to the funiculus, it suggests that the ovule might be curved or bent alongside the stalk. This is seen in campylotropous ovules, where the ovule is curved, and its parts lie alongside but not in line with the funiculus. Therefore, this is incorrect for orthotropous ovules.<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Option (C) At right angles to the funiculus<\/strong><\/p>\n\n\n\n<p>This describes hemitropous ovules, where the body of the ovule is positioned at a 90\u00b0 angle to the funiculus. In this case, the micropyle and chalaza are not in a straight line but at an angle. Hence, this does not describe an orthotropous ovule and is wrong.<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Option (D) Oblique to the funiculus<\/strong><\/p>\n\n\n\n<p>If the micropyle and chalaza are oblique (slanted) to the funiculus, it means they are angled, not straight or perpendicular. This occurs in amphitropous ovules, where the ovule is slightly twisted or curved in such a way that its axis becomes oblique. So, this is also incorrect.<\/p>\n\n\n\n<p><strong>Correct Answer:<\/strong> (A) In the straight line of a funiculus<\/p>\n\n\n\n<p>Option A is correct because Orthotropous ovules are straight and upright. All parts, like micropyle, chalaza, and funiculus, are in a single vertical line. This arrangement is the simplest and most primitive form of ovule orientation. This is found in families like Polygonaceae (e.g., Polygonum).<br><\/p>\n\n\n\n<p><strong>Common Doubts of Biology:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-pale-ocean-gradient-background has-background has-fixed-layout\"><tbody><tr><td><a href=\"https:\/\/leverageedu.com\/questions-answers\/which-of-the-following-is-not-a-water-borne-disease-class-11-biology-cbse\/\"><strong>Which of the following is not a water borne disease?<\/strong><\/a><\/td><\/tr><tr><td><a href=\"https:\/\/leverageedu.com\/questions-answers\/differentiate-between-self-pollination-and-cross-pollination-class-12-biology-cbse\/\"><strong>Differentiate between Self-Pollination and Cross Pollination.<\/strong><\/a><\/td><\/tr><tr><td><a href=\"https:\/\/leverageedu.com\/questions-answers\/describe-the-activities-that-take-place-during-the-photosynthesis-process\/\"><strong>Describe the activities that take place during the photosynthesis process<\/strong><\/a><\/td><\/tr><tr><td><a href=\"https:\/\/leverageedu.com\/questions-answers\/what-is-a-solitary-flower-class-11-biology-cbse\/\"><strong>What is a solitary flower?<\/strong><\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"Answer: An ovule is a structure in flowering plants where fertilisation occurs and seeds develop. It has important&hellip;\n","protected":false},"author":122,"featured_media":4482,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"editor_notices":[],"footnotes":""},"categories":[8,4],"tags":[],"class_list":{"0":"post-4480","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-biology","8":"category-science"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>An Orthotropous Ovule is one in which the Micropyle and Chalaza are<\/title>\n<meta name=\"description\" content=\"Understand the concept of Orthotropous Ovule through this Q\/A for Class 12 students.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/leverageedu.com\/questions-answers\/an-orthotropous-ovule-is-one-in-which-the-micropyle-and-chalaza-are-class-12-biology-cbse\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"An Orthotropous Ovule is one in which the Micropyle and Chalaza are\" \/>\n<meta property=\"og:description\" content=\"Understand the concept of Orthotropous Ovule through this Q\/A for Class 12 students.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/leverageedu.com\/questions-answers\/an-orthotropous-ovule-is-one-in-which-the-micropyle-and-chalaza-are-class-12-biology-cbse\/\" \/>\n<meta property=\"og:site_name\" content=\"Questions &amp; 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