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The assessment covers adaptations of palisade cells and leaves for gas exchange, roles of epidermis, xylem and phloem in transport, and comparisons of plant versus animal transport. Additional questions address leaf structure, desert adaptations including CO2 storage, transpiration–photosynthesis trade-offs, root hair cell developmental control, xerophyte adaptations, stomatal guard cell mechanisms, and potometer methods for estimating transpiration rates.",{"@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/24-plant-tissues-organs-systems-question-paper-aqa-gcse-biology/388343/",{"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/24-plant-tissues-organs-systems-question-paper-aqa-gcse-biology/388343.png","ImageObject",300,407,{"name":92,"@type":93},"AfterMidnight","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-09","2026-09-25",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",21,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"How are palisade cells adapted to their function in photosynthesis?","Question",{"text":113,"@type":114},"The paper asks students to explain structural and functional features that increase light capture and photosynthetic efficiency for palisade cells, linking adaptations to their role in producing sugars.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"Why do plant epidermis cells not contribute much to photosynthesis even though they are closer to the sun?",{"text":118,"@type":114},"The suggested response should explain that epidermis cells are not well suited for photosynthesis (for example due to their features and location), so most photosynthesis occurs in tissues such as palisade mesophyll.",{"name":120,"@type":111,"acceptedAnswer":121},"How can a potometer be used to estimate transpiration rates, and what is inaccurate about assuming it gives the exact amount of water lost?",{"text":122,"@type":114},"Students are expected to describe how changes in water uptake relate to transpiration rate. They must also correct the idea that it tells the exact total water lost, noting limitations and that measurements depend on setup and conditions.","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},388343,1790674342,{"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":140,"language":141,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":142,"faqs":143,"seo_title":144,"seo_description":67,"update_tm":145,"read_time":41,"preview_page_count":4},962090896061,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","Head to www.savemyexams. com for more awesome resources  \n2 .4 Plant Tissues, Organs & Systems  \nQuestion Paper  \n\n| Course | AQA GCSE Biology |\n| --- | --- |\n| Section | 2. Organisation |\n| Topic | 2.4 Plant Tissues, Organs & Systems |\n| Dizculty | Hard |\n\nTime Allowed 90  \nScore /71  \nPercentage /100  \nCheck your answers  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nHead to www.savemyexams. com for more awesome resources  \nQuestion 1a  \nExplain how palisade cells are adapted to their function.  \n[3 marks]  \nQuestion 1b  \nA scientist saw the following query on a question and answer website:  \n\" If plant leaf epidermis cells are the outermost cells in a leaf and closer to the sun, why do they not contribute much to photosynthesis? \"  \nSuggest a suitable response to the query.  \n[4 marks]  \nQuestion 1c  \nExplain howthe leaf is adapted for gas exchange.  \n[4 marks]  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nHead to www.savemyexams. com for more awesome resources  \nQuestion 1d  \nSketch an annotated diagram of the cross-section of a leaf. You do not need to include the structures responsible for transport of food and water.  \n[6 marks]  \nQuestion 2a  \nWhich statement from A to D would indicate that transport of materials in the phloem involves metabolic processes rather than just a physical process?.  \nA. Material can be transported in both directions within the phloem.  \nB. Removing the leaves results in a decrease in rate of transport.  \nC. No transport is observed if the plants are grown in an anoxic environment.  \nD. The rate of transport }uctuates between diyerent plant species.  \n[1 mark]  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nHead to www.savemyexams. com for more awesome resources  \nQuestion 2b  \nFigure 1 shows an aphid feeding on a plant stem.  \nFigure 1  \nExplain why they target structure X.  \n[3 marks]  \nQuestion 2c  \nDescribe how the xylem is adapted for the transport of water.  \n[4 marks]  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nHead to www.savemyexams. com for more awesome resources  \nQuestion 2d  \nCompare the transport systems in plants and animals.  \n[6 marks]  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nHead to www.savemyexams. com for more awesome resources  \nQuestion 3a  \nFigure 2 shows a cross section of a leaf.  \nFigure 2  \nDescribe what is unusual about the underside of the leaf.  \n[1 mark]  \nQuestion 3b  \nExplain which kind of environment the leaf shown in Figure 2 is adapted for.  \n[4 marks]  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nHead to www.savemyexams. com for more awesome resources  \nQuestion 3c  \nMany plants that grow in hot arid environments like the desert, take in CO2 during the night and store it.  \nExplain howthis is advantageous to the plant.  \n[3 marks]  \nQuestion 3d  \nDuring an exam a student wrote the following statement:  \n\" Transpiration and photosynthesis in plants is a compromise \" .  \nSuggest what evidence they could use to support this statement.  \n[4 marks]  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nHead to www.savemyexams. com for more awesome resources  \nQuestion 4a  \nThe development of root hair cells is complicated and under the control of many genes.  \nScientists have created mutants where particular genes are deleted ( ' knocked out ') , these result in diyerent phenotypes (observable characteristics) . Table 1 shows the eyect of knocking out various genes on the growth of root hair cells.  \nTable 1  \n\n| Gene | Eyect of deleting the gene | Phenotype |\n| --- | --- | --- |\n| WEREWOLF(WER1) | Root hairs cells form on every cell | Hairy root |\n| AGP14 | Increased length of root hair cells | Extra Hairy root |\n| CPC | Reduced number of root hair cells | Bald root |\n| DER6 | Shortened length of ","cbCaijpAYYR0hVCd","https://ap.wps.com/l/cbCaijpAYYR0hVCd","pdf",474309,12,"English","# Question Paper\n## Section 2. Organisation\n### 2.4 Plant Tissues, Organs & Systems\n## Question 1\n## Question 2\n## Question 3\n## Question 4\n## Question 5","[{\"question\":\"How are palisade cells adapted to their function in photosynthesis?\",\"answer\":\"The paper asks students to explain structural and functional features that increase light capture and photosynthetic efficiency for palisade cells, linking adaptations to their role in producing sugars.\"},{\"question\":\"Why do plant epidermis cells not contribute much to photosynthesis even though they are closer to the sun?\",\"answer\":\"The suggested response should explain that epidermis cells are not well suited for photosynthesis (for example due to their features and location), so most photosynthesis occurs in tissues such as palisade mesophyll.\"},{\"question\":\"How can a potometer be used to estimate transpiration rates, and what is inaccurate about assuming it gives the exact amount of water lost?\",\"answer\":\"Students are expected to describe how changes in water uptake relate to transpiration rate. They must also correct the idea that it tells the exact total water lost, noting limitations and that measurements depend on setup and conditions.\"}]","2.4 Plant Tissues, Organs & Systems - Question Paper - AQA GCSE Biology | PDF",1790300524]