{"id":3962,"date":"2026-03-22T12:34:52","date_gmt":"2026-03-22T12:34:52","guid":{"rendered":"https:\/\/physicscatalyst.com\/testprep\/class-8-science\/our-home-earth-a-unique-life-sustaining-planet-class-8-mcq\/"},"modified":"2026-03-22T12:34:52","modified_gmt":"2026-03-22T12:34:52","slug":"our-home-earth-a-unique-life-sustaining-planet-class-8-mcq","status":"publish","type":"post","link":"https:\/\/physicscatalyst.com\/testprep\/class-8-science\/our-home-earth-a-unique-life-sustaining-planet-class-8-mcq\/","title":{"rendered":"Our Home: Earth, a Unique Life Sustaining Planet Class 8 MCQ"},"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=\"submittingExam512\" 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-512\"><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-512\"  enctype=\"multipart\/form-data\" >\n<div class='watu-question ' id='question-1' style=';'><div id='questionWrap-1'  class='   watupro-question-id-8556'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>1. <\/span>The greenhouse effect on Venus and Earth is mainly caused by gases like:<\/div><input type='hidden' name='question_id[]' id='qID_1' value='8556' class='watupro-question-id'\/><input type='hidden' id='answerType8556' class='answerTypeCnt1' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8556'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8556[]' id='answer-id-34172' class='answer   answerof-8556  ' value='34172'   \/><label for='answer-id-34172' id='answer-label-34172' class=' answer'><span>Oxygen<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8556[]' id='answer-id-34173' class='answer   answerof-8556  ' value='34173'   \/><label for='answer-id-34173' id='answer-label-34173' class=' answer'><span>Carbon dioxide<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8556[]' id='answer-id-34174' class='answer   answerof-8556  ' value='34174'   \/><label for='answer-id-34174' id='answer-label-34174' class=' answer'><span>Nitrogen<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8556[]' id='answer-id-34175' class='answer   answerof-8556  ' value='34175'   \/><label for='answer-id-34175' id='answer-label-34175' class=' answer'><span>Hydrogen<\/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-8557'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>2. <\/span>When the male and female gametes combine, it is called<\/div><input type='hidden' name='question_id[]' id='qID_2' value='8557' class='watupro-question-id'\/><input type='hidden' id='answerType8557' class='answerTypeCnt2' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8557'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8557[]' id='answer-id-34176' class='answer   answerof-8557  ' value='34176'   \/><label for='answer-id-34176' id='answer-label-34176' class=' answer'><span>fertilisation<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8557[]' id='answer-id-34177' class='answer   answerof-8557  ' value='34177'   \/><label for='answer-id-34177' id='answer-label-34177' class=' answer'><span>pollination<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8557[]' id='answer-id-34178' class='answer   answerof-8557  ' value='34178'   \/><label for='answer-id-34178' id='answer-label-34178' class=' answer'><span>reproduction<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8557[]' id='answer-id-34179' class='answer   answerof-8557  ' value='34179'   \/><label for='answer-id-34179' id='answer-label-34179' class=' answer'><span>None of these<\/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-8558'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>3. <\/span>Earth possesses the ideal size for supporting life, as its gravitational force is sufficiently strong to:<\/div><input type='hidden' name='question_id[]' id='qID_3' value='8558' class='watupro-question-id'\/><input type='hidden' id='answerType8558' class='answerTypeCnt3' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8558'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8558[]' id='answer-id-34180' class='answer   answerof-8558  ' value='34180'   \/><label for='answer-id-34180' id='answer-label-34180' class=' answer'><span>Hold the atmosphere around it<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8558[]' id='answer-id-34181' class='answer   answerof-8558  ' value='34181'   \/><label for='answer-id-34181' id='answer-label-34181' class=' answer'><span>Stop all motion of gases<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8558[]' id='answer-id-34182' class='answer   answerof-8558  ' value='34182'   \/><label for='answer-id-34182' id='answer-label-34182' class=' answer'><span>Prevent liquid water from existing<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8558[]' id='answer-id-34183' class='answer   answerof-8558  ' value='34183'   \/><label for='answer-id-34183' id='answer-label-34183' class=' answer'><span>Crush all living beings<\/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-8559'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>4. <\/span>Earth\u2019s magnetic field is due to<\/div><input type='hidden' name='question_id[]' id='qID_4' value='8559' class='watupro-question-id'\/><input type='hidden' id='answerType8559' class='answerTypeCnt4' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8559'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8559[]' id='answer-id-34184' class='answer   answerof-8559  ' value='34184'   \/><label for='answer-id-34184' id='answer-label-34184' class=' answer'><span>movement of molten iron in Earth\u2019s core<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8559[]' id='answer-id-34185' class='answer   answerof-8559  ' value='34185'   \/><label for='answer-id-34185' id='answer-label-34185' class=' answer'><span>movement of water in ocean<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8559[]' id='answer-id-34186' class='answer   answerof-8559  ' value='34186'   \/><label for='answer-id-34186' id='answer-label-34186' class=' answer'><span>movement of soil in the crust<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8559[]' id='answer-id-34187' class='answer   answerof-8559  ' value='34187'   \/><label for='answer-id-34187' id='answer-label-34187' class=' answer'><span>None of these<\/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-8560'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>5. <\/span>high-energy particles from the sun is called<\/div><input type='hidden' name='question_id[]' id='qID_5' value='8560' class='watupro-question-id'\/><input type='hidden' id='answerType8560' class='answerTypeCnt5' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8560'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8560[]' id='answer-id-34188' class='answer   answerof-8560  ' value='34188'   \/><label for='answer-id-34188' id='answer-label-34188' class=' answer'><span>cosmic rays<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8560[]' id='answer-id-34189' class='answer   answerof-8560  ' value='34189'   \/><label for='answer-id-34189' id='answer-label-34189' class=' answer'><span>solar wind<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8560[]' id='answer-id-34190' class='answer   answerof-8560  ' value='34190'   \/><label for='answer-id-34190' id='answer-label-34190' class=' answer'><span>UV rays<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8560[]' id='answer-id-34191' class='answer   answerof-8560  ' value='34191'   \/><label for='answer-id-34191' id='answer-label-34191' class=' answer'><span>None of these<\/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-8561'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>6. <\/span>The variety of landforms, rocks, and soils on Earth is called:<\/div><input type='hidden' name='question_id[]' id='qID_6' value='8561' class='watupro-question-id'\/><input type='hidden' id='answerType8561' class='answerTypeCnt6' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8561'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8561[]' id='answer-id-34192' class='answer   answerof-8561  ' value='34192'   \/><label for='answer-id-34192' id='answer-label-34192' class=' answer'><span>Atmosphere<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8561[]' id='answer-id-34193' class='answer   answerof-8561  ' value='34193'   \/><label for='answer-id-34193' id='answer-label-34193' class=' answer'><span>hydrosphere<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8561[]' id='answer-id-34194' class='answer   answerof-8561  ' value='34194'   \/><label for='answer-id-34194' id='answer-label-34194' class=' answer'><span>Geodiversity<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8561[]' id='answer-id-34195' class='answer   answerof-8561  ' value='34195'   \/><label for='answer-id-34195' id='answer-label-34195' class=' answer'><span>Biodiversity<\/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-8562'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>7. <\/span>which type of flatworm, can regrow from a fragment of its body?<\/div><input type='hidden' name='question_id[]' id='qID_7' value='8562' class='watupro-question-id'\/><input type='hidden' id='answerType8562' class='answerTypeCnt7' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8562'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8562[]' id='answer-id-34196' class='answer   answerof-8562  ' value='34196'   \/><label for='answer-id-34196' id='answer-label-34196' class=' answer'><span>Planaria<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8562[]' id='answer-id-34197' class='answer   answerof-8562  ' value='34197'   \/><label for='answer-id-34197' id='answer-label-34197' class=' answer'><span>algae<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8562[]' id='answer-id-34198' class='answer   answerof-8562  ' value='34198'   \/><label for='answer-id-34198' id='answer-label-34198' class=' answer'><span>amoeba<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8562[]' id='answer-id-34199' class='answer   answerof-8562  ' value='34199'   \/><label for='answer-id-34199' id='answer-label-34199' class=' answer'><span>None of these<\/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-8563'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>8. <\/span>Vegetative propagation is a type of asexual reproduction in which a new plant can grow from a:<\/div><input type='hidden' name='question_id[]' id='qID_8' value='8563' class='watupro-question-id'\/><input type='hidden' id='answerType8563' class='answerTypeCnt8' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8563'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8563[]' id='answer-id-34200' class='answer   answerof-8563  ' value='34200'   \/><label for='answer-id-34200' id='answer-label-34200' class=' answer'><span>Flower only<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8563[]' id='answer-id-34201' class='answer   answerof-8563  ' value='34201'   \/><label for='answer-id-34201' id='answer-label-34201' class=' answer'><span>Fruit only<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8563[]' id='answer-id-34202' class='answer   answerof-8563  ' value='34202'   \/><label for='answer-id-34202' id='answer-label-34202' class=' answer'><span>Seed coat only<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8563[]' id='answer-id-34203' class='answer   answerof-8563  ' value='34203'   \/><label for='answer-id-34203' id='answer-label-34203' class=' answer'><span>Leaf, stem, or root<\/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-8564'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>9. <\/span>Which component holds Earth\u2019s water?<\/div><input type='hidden' name='question_id[]' id='qID_9' value='8564' class='watupro-question-id'\/><input type='hidden' id='answerType8564' class='answerTypeCnt9' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8564'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8564[]' id='answer-id-34204' class='answer   answerof-8564  ' value='34204'   \/><label for='answer-id-34204' id='answer-label-34204' class=' answer'><span>atmosphere<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8564[]' id='answer-id-34205' class='answer   answerof-8564  ' value='34205'   \/><label for='answer-id-34205' id='answer-label-34205' class=' answer'><span>Lithosphere<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8564[]' id='answer-id-34206' class='answer   answerof-8564  ' value='34206'   \/><label for='answer-id-34206' id='answer-label-34206' class=' answer'><span>bipsphere<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8564[]' id='answer-id-34207' class='answer   answerof-8564  ' value='34207'   \/><label for='answer-id-34207' id='answer-label-34207' class=' answer'><span>Hydrosphere<\/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-8565'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>10. <\/span>which of the following is wrong?<\/div><input type='hidden' name='question_id[]' id='qID_10' value='8565' class='watupro-question-id'\/><input type='hidden' id='answerType8565' class='answerTypeCnt10' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8565'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8565[]' id='answer-id-34208' class='answer   answerof-8565  ' value='34208'   \/><label for='answer-id-34208' id='answer-label-34208' class=' answer'><span>In asexual reproduction, a single parent produces new individuals that are exact copies of itself<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8565[]' id='answer-id-34209' class='answer   answerof-8565  ' value='34209'   \/><label for='answer-id-34209' id='answer-label-34209' class=' answer'><span>Reproduction is essential to ensure the continuity of life on Earth<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8565[]' id='answer-id-34210' class='answer   answerof-8565  ' value='34210'   \/><label for='answer-id-34210' id='answer-label-34210' class=' answer'><span>Presence of ozone in the atmosphere prevents harmful ultraviolet rays from reaching the surface of the Earth<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8565[]' id='answer-id-34211' class='answer   answerof-8565  ' value='34211'   \/><label for='answer-id-34211' id='answer-label-34211' class=' answer'><span>None of 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