MakingFood

MakingFood - StandardGradeBiology Topic2 TheWorldofPlants

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Topic 2 The World of Plants Standard Grade Biology
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World of Plants  is divided into: A- Introducing plants B-  Growing plants (Pollination, Fertilisation,  Asexual reproduction) C- Making food
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Plants- the first link Plants are the link between the energy in the sun being converted into a form which animals can eat and get the energy to survive… Workbook Activity p 54 Food webs and plants The process by which plants do this is called: Photosynthesis All living things respire all the time to release energy from their food in a process called: Respiration
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Plant survival Plants make their own food, glucose, by photosynthesis. It only happens during the daytime when there is light available. This happens in plant cells containing the chemical chlorophyll (green-coloured) which traps the light energy. The plants have captured light energy and turned it into a store of chemical energy (glucose). Raw materials Products carbon dioxide + water glucose + oxygen chlorophyll More on the uses for glucose shortly…
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Is  light  needed for photosynthesis? 1. Take a de-starched geranium plant (24h in dark). 2. Cover part of a leaf with some tin foil (this prevents light getting through). 3. Leave the plant in sunlight for a few hours. 4. Test the leaf for starch.
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Is  carbon dioxide  needed for  photosynthesis? 1. Take a de-starched geranium plant 2. Enclose it in a plastic bag with a chemical that absorbs carbon dioxide. (e.g. soda lime or sodium hydroxide pellets). 3. Leave the plant in sunlight for a couple of hours. 4. Test the leaf for starch.
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Questions: 1. Which parts of the leaf do you think will go blue- black? 2. Why do parts that were not covered contain starch? Is light needed for photosynthesis? Workbook Problem  Solving p 81 Making a starch print
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Is carbon dioxide needed for  photosynthesis? Questions : 1. Does the leaf contain starch? Why/ why not? 2. Has the plant carried out photosynthesis? 3. What would be your control plant’s conditions? (Hint: a control plant should have everything it needs for photosynthesis including carbon dioxide). Workbook Problem  Solving p 76 Plants and greenhouses CO 2 is converted into glucose by photosynthesis.
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Mans’ uses  of plant glucose
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Plants’ uses  of plant glucose Glucose Used immediately to  provide  energy source   for respiration Energy used to  turn sugars,  nutrients into  amino acids  which build up  proteins To make cellulose, the  main  structural  material  in cell walls Raw material for  growth, repair and  replacement of  damaged parts Energy  stored   as   starch  (in leaves,  seeds, roots and  tubers) (energy  stored  in  seeds) Energy  stored  as  sucrose (in fruit)
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Glucose molecule Workbook Activity p 70 Changes in carbohydrate
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Activity  – Testing a plant for  sugar 1. Put a piece of raw onion in a pestle and mortar. 2.
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MakingFood - StandardGradeBiology Topic2 TheWorldofPlants

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