[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-487119-105":59,"doc-detail-487119-en":131},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","why-leaves-change-color-solve-each-problem","Why Leaves Change Color - Solve Each Problem","","An instructional reading passage explains how autumn leaf color changes occur through pigment biology and seasonal signals. It describes chlorophyll as the dominant green pigment that breaks down when day length shortens, revealing carotenoids that already exist in leaves. For vivid reds and purples, the passage explains newly produced anthocyanins formed from stored sugars, influenced by weather patterns rather than frost alone. The final section details leaf drop via an abscission layer that seals and detaches leaves, framing fall as plant recycling.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/why-leaves-change-color-solve-each-problem/487119/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/why-leaves-change-color-solve-each-problem/487119.png","ImageObject",300,407,{"name":92,"@type":93},"dawugda","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-05","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",11,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What triggers a tree to stop making chlorophyll?","Question",{"text":113,"@type":114},"The passage says the change is triggered by shorter day length as summer ends, not by cold alone.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"Why do yellow and gold colors appear in many leaves during autumn?",{"text":118,"@type":114},"Chlorophyll fades, revealing carotenoids that were present in the leaf all along.",{"name":120,"@type":111,"acceptedAnswer":121},"How does weather affect red and purple leaf colors?",{"text":122,"@type":114},"The passage states that reds depend on conditions: sunny early fall with cool nights can produce vivid colors, while drought or a hard freeze can make leaves dull and drop them faster.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},487119,1790884551,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":52,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145,"preview_page_count":4},3985747870947,"https://ap-avatar.wpscdn.com/davatar_3d24733baf745e90a7e4bdd5f77d97b2","In the 1800s, a British scientist named George Stokes studied how light passed through plant extracts, part of a long effort by many scientists to reveal something odd: the green stuff in leaves was actually hiding other colors underneath. That green stuff is chlorophyll, the pigment that lets plants turn sunlight into food. All summer, a healthy maple or oak leaf is packed so full of chlorophyll that you only ever see one shade: green, and lots of it. But here's the twist that makes autumn so spectacular \\u2014 the yellows and oranges you admire in October were quietly present the whole time, simply outnumbered. When the green fades, the leaf finally reveals what it was wearing underneath.  \nTo understand why the green fades, you have to think about what a tree senses as summer ends. It isn't the cold that triggers the change, as many people assume \\u2014 it's the shrinking length of the day. As nights grow longer, a tree reads the darkness like a calendar and begins shutting down its food-making factory to prepare for winter. It stops producing chlorophyll, and the green pigment that was constantly being replaced now breaks down without a replacement. With the green gone, the pigments that survive step into the spotlight.  \nThose surviving pigments are the carotenoids, and they are the same family of molecules that make carrots orange and egg yolks yellow. Unlike chlorophyll, they are tough and slow to break down, so they linger in the leaf after the green disappears. This is why birches and aspens turn such a clean, glowing gold \\u2014 you are seeing pigments that were there all along, unmasked. In a sense, the tree isn't painting the leaf a new color at all; it is erasing the layer that hid the old one. That distinction matters, because not every fall color works this way.  \nThe fiery reds and deep purples, by contrast, are freshly manufactured, and this is where the story gets genuinely surprising. These pigments are called anthocyanins, and the leaf produces them in autumn from leftover sugars trapped inside it. Scientists still debate why a dying leaf would bother building brand-new pigment, but a leading idea is that the red acts like sunscreen, protecting the leaf long enough to pull valuable nutrients back into the tree. Bright, sunny days followed by cool but not freezing nights push more sugar into the leaves and produce the most vivid reds. So a carotenoid leaf shows off what it kept, while an anthocyanin leaf shows off what it made.  \nBecause reds depend on the weather, autumns are not equally colorful from one year to the next. A warm, wet, sunny early fall with crisp nights tends to produce the boldest displays, while a drought or a sudden hard freeze can turn leaves dull brown and drop them fast. This is also why the same species can blaze scarlet in New England yet look muted somewhere warmer. People sometimes credit the frost for the colors, but a killing frost usually ends the show rather than starting it. The real artists are sunlight, sugar, and the steady loss of daylight.  \nOnce the colorful pigments have done their work, the leaf's final act is to let go. At the base of each leaf  \nstalk, the tree grows a special layer of cells called the abscission layer, which slowly seals off the leaf like a healing wound. When that seal is complete, a gust of October wind is all it takes to send the leaf spinning to the ground. The tree isn't losing a battle with winter \\u2014 it is deliberately dropping thousands of tiny factories it can no longer afford to run. So the next time a red leaf drifts past your window, remember you're watching a plant recycle its own sunscreen after a summer of quietly hiding its true colors.  \nWhy Leaves Change Color  \nName:  \n\n| Solve each problem.\u003Cbr>Use the article to answer the question.\u003Cbr>1) According to the passage, what actually triggers a tree to stop making chlorophyll?\u003Cbr>A. The increasing length of night as days grow shorter\u003Cbr>B. The steady cooling of daytime temperatures","cbCairZkdGdnFkxW","https://ap.wps.com/l/cbCairZkdGdnFkxW","pdf",106599,"English","# Solve each problem\n## Questions 1-6","[{\"question\":\"What triggers a tree to stop making chlorophyll?\",\"answer\":\"The passage says the change is triggered by shorter day length as summer ends, not by cold alone.\"},{\"question\":\"Why do yellow and gold colors appear in many leaves during autumn?\",\"answer\":\"Chlorophyll fades, revealing carotenoids that were present in the leaf all along.\"},{\"question\":\"How does weather affect red and purple leaf colors?\",\"answer\":\"The passage states that reds depend on conditions: sunny early fall with cool nights can produce vivid colors, while drought or a hard freeze can make leaves dull and drop them faster.\"}]","Why Leaves Change Color - Solve Each Problem | PDF",1790807861,25]