{"id":26700,"date":"2020-10-13T09:50:01","date_gmt":"2020-10-13T04:20:01","guid":{"rendered":"http:\/\/astan.lk\/al_virtualclassroom\/?p=26700"},"modified":"2020-10-13T09:50:51","modified_gmt":"2020-10-13T04:20:51","slug":"spermatophyta","status":"publish","type":"post","link":"https:\/\/astan.lk\/al_virtualclassroom\/spermatophyta\/","title":{"rendered":"Spermatophyta"},"content":{"rendered":"<p><em>Seed is a structure which consists of embryo, stored food and covered by seed coat to protect itself from mechanical injury, infectious attacks and desiccation <\/em><\/p>\n<p><strong>Spermatophyta<\/strong><\/p>\n<ul>\n<li>Sporophyte generation dominant and free living<\/li>\n<li>Gametophyte recessive and short lived. Depends on the sporophyte<\/li>\n<li>Heterosporous (two types) \u2013 micro spore (pollen) and mega spore (embryo sac)<\/li>\n<li>Different types of leaves (two types) \u2013 microsporophyll and megasporophyll<\/li>\n<li>Development of complex vascular tissues in leaves, stem and root<\/li>\n<li>External water is not necessary for fertilization (development of the pollen tube)<\/li>\n<li>Fertilized ovule \/ mega sporangium become seed<\/li>\n<li>Produce pollen<\/li>\n<li>Pollination before fertilization<\/li>\n<li>Nucleus of male gametes does not swim. Travel through pollen tube<\/li>\n<li>Two types;\n<ul>\n<li>Gymnosperms (naked seed)<\/li>\n<li>Angiospermophyta<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong>Differences between Gymnosperms and angiospermophyta<\/strong><\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"200\"><strong>Characters<\/strong><\/td>\n<td width=\"200\"><strong>Gymnosperms<\/strong><\/td>\n<td width=\"200\"><strong>Angiospermophyta<\/strong><\/td>\n<td width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td rowspan=\"3\" width=\"200\">Ovule<\/td>\n<td rowspan=\"2\" width=\"200\">Appear to the external environment<\/td>\n<td width=\"200\">Do not appear<\/td>\n<td width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td rowspan=\"2\" width=\"200\">Covered by ovary<\/td>\n<td width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td width=\"200\">Not covered by ovary<\/td>\n<\/tr>\n<tr>\n<td width=\"200\">Fruit<\/td>\n<td width=\"200\">Does not form<\/td>\n<td width=\"200\">Forms<\/td>\n<td width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td width=\"200\">Strobilus \/ flower<\/td>\n<td width=\"200\">Strobilus form. Flower does not<\/td>\n<td width=\"200\">Flower form<\/td>\n<td width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td rowspan=\"2\" width=\"200\">Leaves<\/td>\n<td rowspan=\"2\" width=\"200\">Always green<\/td>\n<td width=\"200\">Normally green<\/td>\n<td width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td width=\"200\">Yellow \/ brownish orange at maturity<\/td>\n<td width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td rowspan=\"2\" width=\"200\">Sexual character<\/td>\n<td width=\"200\">Unisexual<\/td>\n<td width=\"200\">Unisexual \/ bisexual<\/td>\n<td width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td width=\"200\">Dioecious<\/td>\n<td width=\"200\">Dioecious \/ monocious<\/td>\n<td width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td rowspan=\"2\" width=\"200\">Example<\/td>\n<td width=\"200\">Cycadophyta<\/td>\n<td rowspan=\"2\" width=\"200\">Anthophyta<\/td>\n<td width=\"0\"><\/td>\n<\/tr>\n<tr>\n<td width=\"200\">Coniferophyta<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u00a0<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Seed is a structure which consists of embryo, stored food and covered by seed coat to protect itself from mechanical injury, infectious attacks and desiccation Spermatophyta Sporophyte generation dominant and free living Gametophyte recessive and short lived. Depends on the sporophyte Heterosporous (two types) \u2013 micro spore (pollen) and mega spore (embryo sac) Different types [&hellip;]<\/p>\n","protected":false},"author":842,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[12,1243],"tags":[],"class_list":["post-26700","post","type-post","status-publish","format-standard","hentry","category-biology","category-bio-diversity"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Spermatophyta - Learning &amp; Education Portal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/astan.lk\/al_virtualclassroom\/spermatophyta\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spermatophyta - Learning &amp; Education Portal\" \/>\n<meta property=\"og:description\" content=\"Seed is a structure which consists of embryo, stored food and covered by seed coat to protect itself from mechanical injury, infectious attacks and desiccation Spermatophyta Sporophyte generation dominant and free living Gametophyte recessive and short lived. 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