ࡱ> _a^q` bjbjqPqP 70:: Q8<,"U288(```"""TTTTTTT$TVhXlT" """T``T$$$"X``T$"T$$LP`, Pu #dcN(TT0"UNh(Ym#(YPPPV(YITX""$"""""TTa$X""""U"""" HD H 2.2.4 Photosynthesis Worksheet Plants making their own food  Role of Photosynthesis Plants use it to _____________________ Animals get their food ______________________ It produces ____________ which is needed to release energy in ______________ It is responsible for forming _______________________ It removes ________________________ from the air  Balanced Equation for Photosynthesis 6______ + 6______ + light ( ________ + 6____ Carbon dioxide + Water + light ( Glucose + Oxygen Photosynthesis requires: _______________________ _______________________ _______________________ _______________________  Photosynthesis produces _______________________ _______________________  Photosynthesis converts __________ energy ( ________________ energy Stages in Photosynthesis Light is _______________________ Water is _______________________ Products are _______________________ (4 protons, 4 electrons and oxygen) Light energises _______________________ Glucose is _______________________ Light is Absorbed The light that reaches a plant is trapped by _______________________ Chlorophyll is found in the _______________________ of plant cells Therefore photosynthesis occurs in _______________________ The trapped light provides the __________ the plants need to make ___________  Water is Split Some of the trapped light energy is used to split water into __________________ (____), protons (____) and ________________ (e) Summarised as 2H2O ( 4H+ and 4e and O2  What happens to these Products? The electrons are passed to _______________________ The protons are stored in a ____________________ for later use The oxygen may pass out of the leaf _______________________ OR it may be used for _______________________  Light Energises Electrons The electrons that were passed to the chlorophyll become __________________ by some of the trapped light energy this changes them into __________________ _______________________________ Glucose is formed The high energy electrons along with ________________ from the proton pool are combined with carbon dioxide to form ______________ (______________ )  Sources of light for plants _______________ is the natural source of light for plants but they can use ____________________ light for photosynthesis Artificial light is often used in ______________________ stimulate growth Increasing light can ________________ ____________ up to a certain saturation point where no more light can be absorbed and photosynthesis will level off  Sources of carbon dioxide for plants Plants have ___________________ of carbon dioxide one is external the other is internal Plants get most of their carbon dioxide from the ____________________ this is external Plants get carbon dioxide internally from their own _______________ _______________________ Sometimes artificial sources of carbon dioxide are used to stimulate growth, e.g. ______________________ in a green house Sources of water for plants Water is absorbed from the ________ by the __________ of plants This water passes up the ________ and is used for _________________________  Syllabus Can you? Define the term: photosynthesis. Express photosynthesis as a balanced reaction. State the nature of photosynthesis from the syllabus what are the main events? State the role & location of chlorophyll. Explain the nature of electron carriage. Identify the sources of light, CO2 & water for photosynthesis. Explain how human intervention can play a role in photosynthesis. 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