{"id":4002,"date":"2026-07-19T14:28:49","date_gmt":"2026-07-19T14:28:49","guid":{"rendered":"https:\/\/physicscatalyst.com\/testprep\/class-9-science\/earth-as-a-systemenergy-matter-and-life-class-9-online-test\/"},"modified":"2026-07-19T14:28:49","modified_gmt":"2026-07-19T14:28:49","slug":"earth-as-a-systemenergy-matter-and-life-class-9-online-test","status":"publish","type":"post","link":"https:\/\/physicscatalyst.com\/testprep\/class-9-science\/earth-as-a-systemenergy-matter-and-life-class-9-online-test\/","title":{"rendered":"Earth as a System:Energy, Matter, and Life class 9 online test"},"content":{"rendered":"<script type=\"text\/javascript\" >\ndocument.addEventListener(\"DOMContentLoaded\", function(event) { \nif(!window.jQuery) alert(\"The important jQuery library is not properly loaded in your site. Your WordPress theme is probably missing the essential wp_head() call. You can switch to another theme and you will see that the plugin works fine and this notice disappears. If you are still not sure what to do you can contact us for help.\");\n});\n<\/script>  \n  \n<div  id=\"watupro_quiz\" class=\"quiz-area single-page-quiz\">\n<p id=\"submittingExam526\" style=\"display:none;text-align:center;\">Please wait...<br><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/physicscatalyst.com\/testprep\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\"><\/p>\n\n<div class=\"watupro-exam-description\" id=\"description-quiz-526\"><p><strong>General Instructions<\/strong><\/p>\n<ul>\n<li>Your test contains multiple-choice questions with only one answer-type question. There are a total of 10 questions<\/li>\n<li>This is a 20 min test. Please make sure you complete it in the stipulated time<\/li>\n<li>You can finish this test any time using the 'Submit' button.<\/li>\n<\/ul>\n<\/div>\n\n<form action=\"\" method=\"post\" class=\"quiz-form\" id=\"quiz-526\"  enctype=\"multipart\/form-data\" >\n<div class='watu-question ' id='question-1' style=';'><div id='questionWrap-1'  class='   watupro-question-id-8696'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>1. <\/span>Which part of solar radiation is mainly responsible for photosynthesis?<\/div><input type='hidden' name='question_id[]' id='qID_1' value='8696' class='watupro-question-id'\/><input type='hidden' id='answerType8696' class='answerTypeCnt1' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8696'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8696[]' id='answer-id-34732' class='answer   answerof-8696  ' value='34732'   \/><label for='answer-id-34732' id='answer-label-34732' class=' answer'><span>Gamma rays<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8696[]' id='answer-id-34733' class='answer   answerof-8696  ' value='34733'   \/><label for='answer-id-34733' id='answer-label-34733' class=' answer'><span>Visible light<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8696[]' id='answer-id-34734' class='answer   answerof-8696  ' value='34734'   \/><label for='answer-id-34734' id='answer-label-34734' class=' answer'><span>Microwaves<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8696[]' id='answer-id-34735' class='answer   answerof-8696  ' value='34735'   \/><label for='answer-id-34735' id='answer-label-34735' class=' answer'><span>Infrared rays<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-2' style=';'><div id='questionWrap-2'  class='   watupro-question-id-8697'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>2. <\/span>Which layer contains the ozone layer?<\/div><input type='hidden' name='question_id[]' id='qID_2' value='8697' class='watupro-question-id'\/><input type='hidden' id='answerType8697' class='answerTypeCnt2' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8697'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8697[]' id='answer-id-34736' class='answer   answerof-8697  ' value='34736'   \/><label for='answer-id-34736' id='answer-label-34736' class=' answer'><span>Thermosphere<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8697[]' id='answer-id-34737' class='answer   answerof-8697  ' value='34737'   \/><label for='answer-id-34737' id='answer-label-34737' class=' answer'><span>Mesosphere<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8697[]' id='answer-id-34738' class='answer   answerof-8697  ' value='34738'   \/><label for='answer-id-34738' id='answer-label-34738' class=' answer'><span>Stratosphere<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8697[]' id='answer-id-34739' class='answer   answerof-8697  ' value='34739'   \/><label for='answer-id-34739' id='answer-label-34739' class=' answer'><span>Troposphere<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-3' style=';'><div id='questionWrap-3'  class='   watupro-question-id-8698'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>3. <\/span>Which gas makes up the largest proportion of Earth\u2019s atmosphere?<\/div><input type='hidden' name='question_id[]' id='qID_3' value='8698' class='watupro-question-id'\/><input type='hidden' id='answerType8698' class='answerTypeCnt3' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8698'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8698[]' id='answer-id-34740' class='answer   answerof-8698  ' value='34740'   \/><label for='answer-id-34740' id='answer-label-34740' class=' answer'><span>Oxygen<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8698[]' id='answer-id-34741' class='answer   answerof-8698  ' value='34741'   \/><label for='answer-id-34741' id='answer-label-34741' class=' answer'><span>hydrogen<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8698[]' id='answer-id-34742' class='answer   answerof-8698  ' value='34742'   \/><label for='answer-id-34742' id='answer-label-34742' class=' answer'><span>Nitrogen<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8698[]' id='answer-id-34743' class='answer   answerof-8698  ' value='34743'   \/><label for='answer-id-34743' id='answer-label-34743' class=' answer'><span>carbon dioxide<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-4' style=';'><div id='questionWrap-4'  class='   watupro-question-id-8699'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>4. <\/span>Which gas is mainly responsible for global warming?<\/div><input type='hidden' name='question_id[]' id='qID_4' value='8699' class='watupro-question-id'\/><input type='hidden' id='answerType8699' class='answerTypeCnt4' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8699'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8699[]' id='answer-id-34744' class='answer   answerof-8699  ' value='34744'   \/><label for='answer-id-34744' id='answer-label-34744' class=' answer'><span>Carbon dioxide<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8699[]' id='answer-id-34745' class='answer   answerof-8699  ' value='34745'   \/><label for='answer-id-34745' id='answer-label-34745' class=' answer'><span>Nitrogen<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8699[]' id='answer-id-34746' class='answer   answerof-8699  ' value='34746'   \/><label for='answer-id-34746' id='answer-label-34746' class=' answer'><span>hydrogen<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8699[]' id='answer-id-34747' class='answer   answerof-8699  ' value='34747'   \/><label for='answer-id-34747' id='answer-label-34747' class=' answer'><span>Oxygen<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-5' style=';'><div id='questionWrap-5'  class='   watupro-question-id-8700'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>5. <\/span>Cryosphere refers to<\/div><input type='hidden' name='question_id[]' id='qID_5' value='8700' class='watupro-question-id'\/><input type='hidden' id='answerType8700' class='answerTypeCnt5' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8700'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8700[]' id='answer-id-34748' class='answer   answerof-8700  ' value='34748'   \/><label for='answer-id-34748' id='answer-label-34748' class=' answer'><span>Forests<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8700[]' id='answer-id-34749' class='answer   answerof-8700  ' value='34749'   \/><label for='answer-id-34749' id='answer-label-34749' class=' answer'><span>Ice-covered regions<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8700[]' id='answer-id-34750' class='answer   answerof-8700  ' value='34750'   \/><label for='answer-id-34750' id='answer-label-34750' class=' answer'><span>Oceans<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8700[]' id='answer-id-34751' class='answer   answerof-8700  ' value='34751'   \/><label for='answer-id-34751' id='answer-label-34751' class=' answer'><span>Deserts<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-6' style=';'><div id='questionWrap-6'  class='   watupro-question-id-8701'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>6. <\/span>Ocean currents are mainly driven by<\/div><input type='hidden' name='question_id[]' id='qID_6' value='8701' class='watupro-question-id'\/><input type='hidden' id='answerType8701' class='answerTypeCnt6' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8701'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8701[]' id='answer-id-34752' class='answer   answerof-8701  ' value='34752'   \/><label for='answer-id-34752' id='answer-label-34752' class=' answer'><span>Earth\u2019s tilt<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8701[]' id='answer-id-34753' class='answer   answerof-8701  ' value='34753'   \/><label for='answer-id-34753' id='answer-label-34753' class=' answer'><span>Planetary winds and pressure differences<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8701[]' id='answer-id-34754' class='answer   answerof-8701  ' value='34754'   \/><label for='answer-id-34754' id='answer-label-34754' class=' answer'><span>Moon\u2019s gravity<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8701[]' id='answer-id-34755' class='answer   answerof-8701  ' value='34755'   \/><label for='answer-id-34755' id='answer-label-34755' class=' answer'><span>Volcanoes<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-7' style=';'><div id='questionWrap-7'  class='   watupro-question-id-8702'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>7. <\/span>If the Earth\u2019s albedo suddenly increases, what would most likely happen?<\/div><input type='hidden' name='question_id[]' id='qID_7' value='8702' class='watupro-question-id'\/><input type='hidden' id='answerType8702' class='answerTypeCnt7' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8702'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8702[]' id='answer-id-34756' class='answer   answerof-8702  ' value='34756'   \/><label for='answer-id-34756' id='answer-label-34756' class=' answer'><span>Increase in global temperature<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8702[]' id='answer-id-34757' class='answer   answerof-8702  ' value='34757'   \/><label for='answer-id-34757' id='answer-label-34757' class=' answer'><span>Decrease in global temperature<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8702[]' id='answer-id-34758' class='answer   answerof-8702  ' value='34758'   \/><label for='answer-id-34758' id='answer-label-34758' class=' answer'><span>No change in climate<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8702[]' id='answer-id-34759' class='answer   answerof-8702  ' value='34759'   \/><label for='answer-id-34759' id='answer-label-34759' class=' answer'><span>Increase in greenhouse gases<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-8' style=';'><div id='questionWrap-8'  class='   watupro-question-id-8703'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>8. <\/span>Nearly all real-world weather phenomena, such as clouds, rain, and storms, occur in which layer of the atmosphere?<\/div><input type='hidden' name='question_id[]' id='qID_8' value='8703' class='watupro-question-id'\/><input type='hidden' id='answerType8703' class='answerTypeCnt8' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8703'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8703[]' id='answer-id-34760' class='answer   answerof-8703  ' value='34760'   \/><label for='answer-id-34760' id='answer-label-34760' class=' answer'><span>Stratosphere<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8703[]' id='answer-id-34761' class='answer   answerof-8703  ' value='34761'   \/><label for='answer-id-34761' id='answer-label-34761' class=' answer'><span>Mesosphere<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8703[]' id='answer-id-34762' class='answer   answerof-8703  ' value='34762'   \/><label for='answer-id-34762' id='answer-label-34762' class=' answer'><span>Thermosphere<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8703[]' id='answer-id-34763' class='answer   answerof-8703  ' value='34763'   \/><label for='answer-id-34763' id='answer-label-34763' class=' answer'><span>Troposphere<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-9' style=';'><div id='questionWrap-9'  class='   watupro-question-id-8704'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>9. <\/span>Which bacteria convert ammonia into nitrite?<\/div><input type='hidden' name='question_id[]' id='qID_9' value='8704' class='watupro-question-id'\/><input type='hidden' id='answerType8704' class='answerTypeCnt9' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8704'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8704[]' id='answer-id-34764' class='answer   answerof-8704  ' value='34764'   \/><label for='answer-id-34764' id='answer-label-34764' class=' answer'><span>Rhizobium<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8704[]' id='answer-id-34765' class='answer   answerof-8704  ' value='34765'   \/><label for='answer-id-34765' id='answer-label-34765' class=' answer'><span>Pseudomonas<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8704[]' id='answer-id-34766' class='answer   answerof-8704  ' value='34766'   \/><label for='answer-id-34766' id='answer-label-34766' class=' answer'><span>Nitrosomonas<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8704[]' id='answer-id-34767' class='answer   answerof-8704  ' value='34767'   \/><label for='answer-id-34767' id='answer-label-34767' class=' answer'><span>Nitrobacter<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-10' style=';'><div id='questionWrap-10'  class='   watupro-question-id-8705'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>10. <\/span>Farmers in hilly regions benefit from mountain breezes because __________.<\/div><input type='hidden' name='question_id[]' id='qID_10' value='8705' class='watupro-question-id'\/><input type='hidden' id='answerType8705' class='answerTypeCnt10' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8705'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8705[]' id='answer-id-34768' class='answer   answerof-8705  ' value='34768'   \/><label for='answer-id-34768' id='answer-label-34768' class=' answer'><span>They block rainfall.<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8705[]' id='answer-id-34769' class='answer   answerof-8705  ' value='34769'   \/><label for='answer-id-34769' id='answer-label-34769' class=' answer'><span>They reduce soil fertility.<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8705[]' id='answer-id-34770' class='answer   answerof-8705  ' value='34770'   \/><label for='answer-id-34770' id='answer-label-34770' class=' answer'><span>They increase soil erosion.<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8705[]' id='answer-id-34771' class='answer   answerof-8705  ' value='34771'   \/><label for='answer-id-34771' id='answer-label-34771' class=' answer'><span>They cool crops and regulate moisture.<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div style='display:none' id='question-11'>\n\t<div class='question-content'>\n\t\t<img loading=\"lazy\" decoding=\"async\" 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