{"id":2286,"date":"2025-10-02T16:26:23","date_gmt":"2025-10-02T13:26:23","guid":{"rendered":"https:\/\/cedra.academy\/?p=2286"},"modified":"2025-11-03T16:27:24","modified_gmt":"2025-11-03T14:27:24","slug":"fotosinteza-fabrica-verde-a-vietii","status":"publish","type":"post","link":"https:\/\/cedra.academy\/?p=2286","title":{"rendered":"Fotosinteza \u2013 fabrica verde a vie\u021bii"},"content":{"rendered":"\n
Fotosinteza – fabrica verde a vie\u021bii. Prezentare PPTX <\/a>Descarc\u0103<\/a><\/div>\n\n\n\n
\n
\"\"<\/figure>\n<\/figure>\n\n\n\n

Introducere<\/strong><\/h3>\n\n\n\n

Via\u021ba pe P\u0103m\u00e2nt depinde de un proces aparent simplu, dar extraordinar de complex \u2013 fotosinteza<\/strong>. F\u0103r\u0103 ea, nu ar exista oxigenul pe care \u00eel respir\u0103m, hrana pe care o consum\u0103m \u0219i nici echilibrul climatic necesar vie\u021buitoarelor. Plantele verzi, algele \u0219i unele bacterii au capacitatea de a transforma energia solar\u0103 \u00een energie chimic\u0103, adic\u0103 \u00een hran\u0103. Din acest motiv, fotosinteza mai este numit\u0103 \u0219i \u201emotorul vie\u021bii pe planet\u0103\u201d.<\/p>\n\n\n\n

Imagina\u021bi-v\u0103 c\u0103 fiecare frunz\u0103 este o mic\u0103 fabric\u0103 verde<\/strong>, care lucreaz\u0103 zi de zi, alimentat\u0103 de razele soarelui. Rezultatele muncii ei se r\u0103sfr\u00e2ng asupra tuturor organismelor: oameni, animale, alte plante.<\/p>\n\n\n\n

Ce este fotosinteza?<\/strong><\/h3>\n\n\n\n

Fotosinteza este procesul biologic prin care plantele verzi produc substan\u021be organice<\/strong> (\u00een special glucoz\u0103) din dioxid de carbon (CO\u2082)<\/strong> \u0219i ap\u0103 (H\u2082O)<\/strong>, utiliz\u00e2nd energia luminii solare<\/strong>. \u00cen timpul acestui proces, plantele elibereaz\u0103 oxigen (O\u2082)<\/strong>, indispensabil vie\u021bii.<\/p>\n\n\n\n

Formula simplificat\u0103 a fotosintezei:
\ud83c\udf1e Lumin\u0103 + Ap\u0103 + Dioxid de carbon \u2192 Glucoz\u0103 + Oxigen<\/strong><\/p>\n\n\n\n

Mai exact:
6CO\u2082 + 6H\u2082O + energie solar\u0103 \u2192 C\u2086H\u2081\u2082O\u2086 + 6O\u2082<\/p>\n\n\n\n

Unde are loc fotosinteza?<\/strong><\/h3>\n\n\n\n
    \n
  • Procesul are loc \u00een frunze<\/strong>, \u00een special \u00een celulele care con\u021bin cloroplaste<\/strong>.<\/li>\n\n\n\n
  • Clorofila<\/strong>, pigmentul verde al plantelor, absoarbe energia luminoas\u0103.<\/li>\n\n\n\n
  • Frunza este adaptat\u0103 pentru fotosintez\u0103 prin:\n
      \n
    • epiderma sub\u021bire<\/strong> care las\u0103 lumina s\u0103 p\u0103trund\u0103,<\/li>\n\n\n\n
    • stomatele<\/strong> prin care intr\u0103 CO\u2082 \u0219i iese O\u2082,<\/li>\n\n\n\n
    • re\u021beaua de nervuri<\/strong> care transport\u0103 apa \u0219i substan\u021bele nutritive.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n

      Astfel, frunza este un adev\u0103rat \u201elaborator viu\u201d al plantei.<\/p>\n\n\n\n

      Etapele fotosintezei<\/strong><\/h3>\n\n\n\n

      Fotosinteza se desf\u0103\u0219oar\u0103 \u00een dou\u0103 mari etape:<\/p>\n\n\n\n

        \n
      1. Reac\u021biile luminoase<\/strong> (au loc \u00een prezen\u021ba luminii, \u00een cloroplaste): energia solar\u0103 este absorbit\u0103 de clorofil\u0103 \u0219i transformat\u0103 \u00een energie chimic\u0103. Se elibereaz\u0103 oxigen.<\/li>\n\n\n\n
      2. Reac\u021biile \u00eentunecoase<\/strong> (pot avea loc \u0219i f\u0103r\u0103 lumin\u0103, dar folosesc energia acumulat\u0103 anterior): CO\u2082 este transformat \u00een glucoz\u0103.<\/li>\n<\/ol>\n\n\n\n

        Tipuri de organisme fotosintetizante<\/strong><\/h3>\n\n\n\n
          \n
        • Plantele verzi<\/strong> (toate speciile cu frunze verzi).<\/li>\n\n\n\n
        • Algele<\/strong> \u2013 produc mare parte din oxigenul planetei.<\/li>\n\n\n\n
        • Bacterii fotosintetizante<\/strong> \u2013 unele tr\u0103iesc \u00een medii extreme, dar contribuie la ciclurile naturii.<\/li>\n<\/ul>\n\n\n\n

          Importan\u021ba fotosintezei<\/strong><\/h3>\n\n\n\n

          Fotosinteza are un rol uria\u0219, nu doar pentru plante, ci pentru \u00eentreaga biosfer\u0103:<\/p>\n\n\n\n

            \n
          • Rol ecologic<\/strong>:\n
              \n
            • men\u021bine echilibrul oxigen\u2013dioxid de carbon \u00een atmosfer\u0103;<\/li>\n\n\n\n
            • sus\u021bine lan\u021burile trofice, fiind baza hranei pentru toate vie\u021buitoarele.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
            • Rol climatic<\/strong>:\n
                \n
              • reduce cantitatea de CO\u2082, responsabil\u0103 de \u00eenc\u0103lzirea global\u0103;<\/li>\n\n\n\n
              • p\u0103durile \u0219i zonele verzi regleaz\u0103 temperatura \u0219i umiditatea aerului.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
              • Rol economic \u0219i social<\/strong>:\n
                  \n
                • prin fotosintez\u0103, plantele produc recolte (fructe, legume, cereale), lemn, fibre textile (bumbac, in);<\/li>\n\n\n\n
                • turismul \u0219i peisajele naturale se datoreaz\u0103 \u00een mare parte vegeta\u021biei.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                • Rol spiritual \u0219i cultural<\/strong>:\n
                    \n
                  • plantele \u0219i frumuse\u021bea naturii au inspirat poe\u021bi, pictori, filosofi.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n

                    Curiozit\u0103\u021bi despre fotosintez\u0103<\/strong><\/h3>\n\n\n\n
                      \n
                    • Aproximativ 70% din oxigenul planetei<\/strong> provine de la algele marine, nu de la p\u0103durile terestre.<\/li>\n\n\n\n
                    • O singur\u0103 frunz\u0103 de copac poate produce oxigen pentru un om timp de c\u00e2teva minute.<\/li>\n\n\n\n
                    • Dac\u0103 fotosinteza ar \u00eenceta, via\u021ba pe P\u0103m\u00e2nt ar disp\u0103rea \u00een c\u00e2teva s\u0103pt\u0103m\u00e2ni.<\/li>\n<\/ul>\n\n\n\n

                      Activitate aplicativ\u0103<\/strong><\/h3>\n\n\n\n
                        \n
                      • Experiment<\/strong>:\n
                          \n
                        • Pune o plant\u0103 \u00eentr-o camer\u0103 luminat\u0103 \u0219i alta \u00eentr-un spa\u021biu \u00eentunecat, ud\u0103-le la fel \u0219i observ\u0103 dup\u0103 o s\u0103pt\u0103m\u00e2n\u0103 diferen\u021bele. Vei descoperi c\u00e2t de important\u0103 este lumina pentru fotosintez\u0103.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                        • Sarcin\u0103 creativ\u0103<\/strong>:\n
                            \n
                          • Realizeaz\u0103 o schem\u0103 intitulat\u0103 \u201eDrumul luminii \u00een frunz\u0103\u201d \u2013 arat\u0103 prin s\u0103ge\u021bi cum intr\u0103 apa \u0219i CO\u2082, cum se capteaz\u0103 energia luminoas\u0103 \u0219i cum ies oxigenul \u0219i hrana.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n

                            Concluzie<\/strong><\/h3>\n\n\n\n

                            Fotosinteza este \u201efabrica verde a vie\u021bii\u201d. Datorit\u0103 acestui proces, plantele transform\u0103 energia solar\u0103 \u00een hran\u0103 \u0219i oxigen, oferindu-ne nou\u0103, oamenilor \u0219i animalelor, posibilitatea de a tr\u0103i. Fiecare copac, fiecare frunz\u0103 \u0219i fiecare fir de iarb\u0103 contribuie la echilibrul planetei.<\/p>\n\n\n\n

                            De aceea, este esen\u021bial s\u0103 protej\u0103m plantele, p\u0103durile \u0219i mediul natural \u2013 ele nu sunt doar decorul vie\u021bii, ci sursa ei.<\/p>\n\n\n\n

                            ___________________________________________________________________________________<\/p>\n\n\n\n

                            Fi\u0219\u0103 de lucru \u2013 Biologie<\/strong><\/h1>\n\n\n\n

                            Tema: Fotosinteza \u2013 fabrica verde a vie\u021bii<\/h2>\n\n\n\n

                            Clasa:<\/strong> \u2026\u2026\u2026\u2026
                            Nume \u0219i prenume:<\/strong> \u2026\u2026\u2026\u2026<\/p>\n\n\n\n

                            \n\n\n\n

                            I. Alegerea r\u0103spunsului corect (10 p \u2013 c\u00e2te 2 p fiecare)<\/strong><\/h3>\n\n\n\n
                              \n
                            1. Substan\u021ba care d\u0103 frunzelor culoarea verde \u0219i particip\u0103 la fotosintez\u0103 este:
                              a) hemoglobina
                              b) clorofila
                              c) oxigenul
                              d) azotul<\/li>\n\n\n\n
                            2. Fotosinteza are loc \u00een principal \u00een:
                              a) r\u0103d\u0103cin\u0103
                              b) floare
                              c) frunz\u0103
                              d) tulpin\u0103<\/li>\n\n\n\n
                            3. Oxigenul rezultat din fotosintez\u0103:
                              a) r\u0103m\u00e2ne \u00een frunz\u0103
                              b) este eliberat \u00een atmosfer\u0103
                              c) este transformat \u00een ap\u0103
                              d) se depoziteaz\u0103 \u00een r\u0103d\u0103cini<\/li>\n\n\n\n
                            4. Care dintre urm\u0103toarele organisme NU realizeaz\u0103 fotosintez\u0103?
                              a) algele
                              b) plantele verzi
                              c) unele bacterii
                              d) ciupercile<\/li>\n\n\n\n
                            5. Formula simplificat\u0103 a fotosintezei este:
                              a) ap\u0103 + lumin\u0103 \u2192 oxigen
                              b) CO\u2082 + ap\u0103 + lumin\u0103 \u2192 glucoz\u0103 + O\u2082
                              c) glucoz\u0103 + O\u2082 \u2192 energie + ap\u0103
                              d) ap\u0103 + oxigen \u2192 glucoz\u0103<\/li>\n<\/ol>\n\n\n\n
                              \n\n\n\n

                              II. Completeaz\u0103 spa\u021biile libere (15 p \u2013 c\u00e2te 3 p fiecare)<\/strong><\/h3>\n\n\n\n
                                \n
                              1. Pigmentul verde din frunze se nume\u0219te ____________.<\/li>\n\n\n\n
                              2. Prin fotosintez\u0103 se consum\u0103 ____________ \u0219i ____________.<\/li>\n\n\n\n
                              3. Produsele fotosintezei sunt ____________ \u0219i ____________.<\/li>\n\n\n\n
                              4. Organele specializate unde are loc fotosinteza sunt ____________.<\/li>\n\n\n\n
                              5. Stomatele frunzelor permit schimbul de ____________ cu atmosfera.<\/li>\n<\/ol>\n\n\n\n
                                \n\n\n\n

                                III. Potrivire (10 p \u2013 c\u00e2te 2 p fiecare)<\/strong><\/h3>\n\n\n\n

                                Potrive\u0219te termenii din coloana A cu explica\u021bia corespunz\u0103toare din coloana B:<\/p>\n\n\n\n

                                A<\/strong><\/p>\n\n\n\n

                                  \n
                                1. Cloroplaste<\/li>\n\n\n\n
                                2. Glucoz\u0103<\/li>\n\n\n\n
                                3. Oxigen<\/li>\n\n\n\n
                                4. Ap\u0103<\/li>\n\n\n\n
                                5. Dioxid de carbon<\/li>\n<\/ol>\n\n\n\n

                                  B<\/strong>
                                  a) Gaz eliberat \u00een atmosfer\u0103 prin fotosintez\u0103
                                  b) Zah\u0103r rezultat ca produs al fotosintezei
                                  c) Organele celulare unde are loc fotosinteza
                                  d) Materie prim\u0103 adus\u0103 de r\u0103d\u0103cini
                                  e) Materie prim\u0103 preluat\u0103 din atmosfer\u0103<\/p>\n\n\n\n

                                  \n\n\n\n

                                  IV. \u00centreb\u0103ri deschise (20 p \u2013 c\u00e2te 10 p fiecare)<\/strong><\/h3>\n\n\n\n
                                    \n
                                  1. De ce se nume\u0219te fotosinteza \u201efabrica verde a vie\u021bii\u201d?<\/li>\n\n\n\n
                                  2. Explic\u0103 pe scurt rolul fotosintezei \u00een men\u021binerea echilibrului atmosferei.<\/li>\n<\/ol>\n\n\n\n
                                    \n\n\n\n

                                    V. Activitate aplicativ\u0103 (25 p)<\/strong><\/h3>\n\n\n\n

                                    Realizeaz\u0103 o schem\u0103 intitulat\u0103 \u201eDrumul luminii \u00een frunz\u0103\u201d<\/strong>, \u00een care s\u0103 ar\u0103\u021bi:<\/p>\n\n\n\n

                                      \n
                                    • cum intr\u0103 lumina, apa \u0219i dioxidul de carbon;<\/li>\n\n\n\n
                                    • unde se formeaz\u0103 glucoza;<\/li>\n\n\n\n
                                    • cum iese oxigenul.<\/li>\n<\/ul>\n\n\n\n
                                      \n\n\n\n

                                      VI. Bonus (20 p \u2013 pentru nota 10+)<\/strong><\/h3>\n\n\n\n

                                      Scrie un scurt eseu (6\u20138 r\u00e2nduri) cu titlul:
                                      \u201eDe ce trebuie s\u0103 protej\u0103m p\u0103durile \u0219i plantele verzi?\u201d<\/strong><\/p>\n\n\n\n

                                      \n\n\n\n

                                      Barem orientativ<\/strong><\/h2>\n\n\n\n
                                        \n
                                      • I. Alegerea r\u0103spunsului corect \u2013 10p<\/li>\n\n\n\n
                                      • II. Completeaz\u0103 \u2013 15p<\/li>\n\n\n\n
                                      • III. Potrivire \u2013 10p<\/li>\n\n\n\n
                                      • IV. \u00centreb\u0103ri deschise \u2013 20p<\/li>\n\n\n\n
                                      • V. Activitate aplicativ\u0103 \u2013 25p<\/li>\n\n\n\n
                                      • VI. Bonus \u2013 20p<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

                                        Introducere Via\u021ba pe P\u0103m\u00e2nt depinde de un proces aparent simplu, dar extraordinar de complex \u2013 fotosinteza. F\u0103r\u0103 ea, nu ar exista oxigenul pe care \u00eel respir\u0103m, hrana pe care o […]<\/p>\n","protected":false},"author":1,"featured_media":2291,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,10],"tags":[],"_links":{"self":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts\/2286"}],"collection":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2286"}],"version-history":[{"count":1,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts\/2286\/revisions"}],"predecessor-version":[{"id":2292,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts\/2286\/revisions\/2292"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/media\/2291"}],"wp:attachment":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2286"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2286"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}