{"id":50,"date":"2024-04-04T08:54:54","date_gmt":"2024-04-04T05:54:54","guid":{"rendered":"https:\/\/sisu.ut.ee\/biopohikool\/2-mis-iseloomustab-kasnasid\/"},"modified":"2024-04-04T08:56:56","modified_gmt":"2024-04-04T05:56:56","slug":"2-mis-iseloomustab-kasnasid","status":"publish","type":"page","link":"https:\/\/sisu.ut.ee\/biopohikool\/2-mis-iseloomustab-kasnasid\/","title":{"rendered":"2. MIS ISELOOMUSTAB K\u00c4SNASID?"},"content":{"rendered":"<p>\n\t<strong>K\u00e4snal<\/strong>\u00a0koed puuduvad, keha hoiab p\u00fcsti lihtne sisetoes. Erinevat t\u00fc\u00fcpi rakud:\u00a0<strong>tugirakud<\/strong>,\u00a0<strong>katterakud<\/strong>,\u00a0<strong>kaelusviburrakud<\/strong>.\u00a0 K\u00e4snade v\u00e4limus ei meenuta loomi. Kinnituvad veekogude p\u00f5hja. Toiduks kasutavad vees h\u00f5ljuvaid toiduosakesi. Eestis elavad j\u00e4rve- ja j\u00f5ek\u00e4sn. Enamik k\u00e4snaliike elab soojades meredes. K\u00e4sna suurus v\u00f5ib olla m\u00f5nest mm-st kuni meetrini. K\u00f5ige pikemaealised on klaask\u00e4snad\u00a0(50 a).\n<\/p>\n<p>\n\t\u00a0\n<\/p>\n<ul>\n<li>\n\t\tK\u00e4snad sigivad peamiselt pungumise teel, kuid ka sugurakkude abil.\n\t<\/li>\n<li>\n\t\tEestis elavatel k\u00e4snadel moodustuvad tugeva kestaga sisepungad.\n\t<\/li>\n<li>\n\t\tK\u00e4snadel on v\u00f5ime taastada kaotatud kehaosi. Seda kasutatakse pesuk\u00e4snade kunstlikul kasvatamisel.\n\t<\/li>\n<li>\n\t\tSuured k\u00e4snad filtreerivad tuhandeid liitreid vett p\u00e4evas, s\u00f5rmeotsasuurune k\u00e4sn suudab puhastada \u00f6\u00f6p\u00e4evas kolm liitrit vett.\n\t<\/li>\n<\/ul>\n<h4>\n\tVaata videot<br>\n<\/h4>\n<p>\n\tK\u00e4snad (Dayilii)\n<\/p>\n<p>\n\t<\/p><div class=\"ratio ratio-16x9 mb-3\"><div class=\"video-placeholder-wrapper video-placeholder-wrapper--16x9\">\n\t\t\t    <div class=\"video-placeholder d-flex justify-content-center align-items-center\">\n\t\t\t        <div class=\"overlay text-white p-2 w-100 text-center d-block justify-content-center align-items-center\">\n\t\t\t            <div>Kolmandate osapoolte sisu n\u00e4gemiseks palun n\u00f5ustu k\u00fcpsistega.<\/div>\n\t\t\t            <button class=\"btn btn-secondary btn-sm mt-1 consent-change\">Muuda n\u00f5usolekut<\/button>\n\t\t\t        <\/div>\n\t\t\t    <\/div>\n\t\t\t<\/div>\n<\/div>\n\n<p>\n\t\u00a0\n<\/p>\n<table class=\"table table-hover\" border=\"1\" cellpadding=\"0\" cellspacing=\"0\" id=\"yui_3_17_2_1_1697365239616_49\" width=\"568\">\n<tbody id=\"yui_3_17_2_1_1697365239616_48\">\n<tr>\n<th scope=\"col\">\n<p>\n\t\t\t\t\t<strong>K\u00e4snade t\u00e4htsus looduses<\/strong>\n\t\t\t\t<\/p>\n<\/th>\n<th scope=\"col\">\n<p>\n\t\t\t\t\t<strong>K\u00e4snade t\u00e4htsus inimese elus<\/strong>\n\t\t\t\t<\/p>\n<\/th>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"284\">\n<ul>\n<li>\n\t\t\t\t\t\tBiofiltrid.\n\t\t\t\t\t<\/li>\n<li>\n\t\t\t\t\t\tToiduks m\u00f5nedele loomadele.\n\t\t\t\t\t<\/li>\n<li>\n\t\t\t\t\t\tS\u00fcmbioos krabide, vetikatega.\n\t\t\t\t\t<\/li>\n<li>\n\t\t\t\t\t\tElupaik tigudele, merit\u00e4htedele, v\u00e4ikestele v\u00e4hikestele.\n\t\t\t\t\t<\/li>\n<\/ul>\n<\/td>\n<td valign=\"top\" width=\"284\">\n<ul>\n<li>\n\t\t\t\t\t\tPesuk\u00e4snad.\n\t\t\t\t\t<\/li>\n<li>\n\t\t\t\t\t\tRavimit\u00f6\u00f6stuse tooraineks.\n\t\t\t\t\t<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\n\t<img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"528\" class=\"alignnone wp-image-202\" style=\"width: 800px;height: 422px\" src=\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/648\/kasnad_est.png\" title=\"Joonis 17. K\u00e4sna ehitus\" alt=\"Joonis 17. K\u00e4sna ehitus\" srcset=\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/648\/kasnad_est.png 1000w, https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/648\/kasnad_est-300x158.png 300w, https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/648\/kasnad_est-768x406.png 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\">\n<\/p>\n<p>\n\t<strong>Harjutused k\u00e4snade kohta:<\/strong>\u00a0<a href=\"http:\/\/taskutark.ee\/test\/kasnad-kui-esimesed-hulkraksed-loomad\/\" target=\"_blank\" rel=\"noopener\">http:\/\/taskutark.ee\/test\/kasnad-kui-esimesed-hulkraksed-loomad\/<\/a>\n<\/p>\n<p>\n\t\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>K\u00e4snal\u00a0koed puuduvad, keha hoiab p\u00fcsti lihtne sisetoes. Erinevat t\u00fc\u00fcpi rakud:\u00a0tugirakud,\u00a0katterakud,\u00a0kaelusviburrakud.\u00a0 K\u00e4snade v\u00e4limus ei meenuta loomi. Kinnituvad veekogude p\u00f5hja. Toiduks kasutavad vees h\u00f5ljuvaid toiduosakesi. Eestis elavad j\u00e4rve- ja j\u00f5ek\u00e4sn. Enamik k\u00e4snaliike elab soojades meredes. K\u00e4sna suurus v\u00f5ib olla m\u00f5nest mm-st kuni &#8230;<\/p>\n","protected":false},"author":345,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-50","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/sisu.ut.ee\/biopohikool\/wp-json\/wp\/v2\/pages\/50","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sisu.ut.ee\/biopohikool\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sisu.ut.ee\/biopohikool\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sisu.ut.ee\/biopohikool\/wp-json\/wp\/v2\/users\/345"}],"replies":[{"embeddable":true,"href":"https:\/\/sisu.ut.ee\/biopohikool\/wp-json\/wp\/v2\/comments?post=50"}],"version-history":[{"count":1,"href":"https:\/\/sisu.ut.ee\/biopohikool\/wp-json\/wp\/v2\/pages\/50\/revisions"}],"predecessor-version":[{"id":590,"href":"https:\/\/sisu.ut.ee\/biopohikool\/wp-json\/wp\/v2\/pages\/50\/revisions\/590"}],"wp:attachment":[{"href":"https:\/\/sisu.ut.ee\/biopohikool\/wp-json\/wp\/v2\/media?parent=50"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}