9 c plants and photosynthesis

9 c plants and photosynthesis

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  © Boardworks Ltd2003
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  Teacher’s Notes A slidecontains teacher’s notes wherever this icon is displayed - To access these notes go to ‘Notes Page View’ (PowerPoint 97) or ‘Normal View’ (PowerPoint 2000). Notes Page View Normal View Flash Files A flash file has been embedded into the PowerPoint slide wherever this icon is displayed – These files are not editable. © Boardworks Ltd 2003
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  Leaves Leaves arelike small factories that produce food for the plant. Different parts of the leaf have different jobs. The veins in a leaf are bundles of tiny tubes that carry water and minerals to the leaf and return food from the leaf to the rest of the plant. Veins also help to support the leaf. © Boardworks Ltd 2003
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  Leaves © Boardworks Ltd 2003
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  Photosynthesis Leaves are green because they contain small bodies in the cells called chloroplasts. The chloroplasts contain a green pigment called chlorophyll. This green material gives the leaf its colour. With the help of chlorophyll and energy from the sun, a leaf can change lifeless substances into food. This process is called photosynthesis. Plants need water (H2O) and carbon dioxide (CO2) to make food through the process of photosynthesis. The water is gathered by the plant's roots. Carbon dioxide is gathered from the air through the stomata. © Boardworks Ltd 2003
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  Photosynthesis (continued) The leaf uses chlorophyll and sunlight to change the water and carbon dioxide into oxygen and glucose (sugar). This sugar is mixed with water and sent to other parts of the plant to be used by the plant as food. The oxygen is released into the air through the stomata. This is usually written as: Light Carbon + water Glucose + oxygen Chlorophyll This is usually read as carbon dioxide plus water in the presence of light and chlorophyll produces oxygen and sugar glucose. © Boardworks Ltd 2003
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  Photosynthesis summary Chloroplast They contain a green pigment These are small structures called chlorophyll. that vary in number and size. LIGHT Chlorophyll The chlorophyll traps sunlight the Photosynthesis is the name of and uses thisChloroplasts arethe the Therefore, energy to drive where chemical reaction that produces process ofplant’s food. food. a plant makes its own photosynthesis. © Boardworks Ltd 2003
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  Photosynthesis activity © Boardworks Ltd 2003
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  Photosynthesis Weknow that plants make their own food from sunlight. They are the producers in the food chain. This is done in the green parts of the plant, e.g. upper surface of the leaves. The reaction for this is: FOOD CARBON + WATER (GLUCOSE) + OXYGEN + ENERGY DIOXIDE Taken in through Taken in Made waste USEFUL! holes in the through byphotosynthe product leaves the roots sis and stored exhaled as starch in leaves, roots, With light and stems, etc. chlorophyll © Boardworks Ltd 2003
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  Roots The roots of a plant provide: • A way of getting water from the ground. • Stability for the plant by anchoring it into the ground. The water absorbed by the plant is used for: • Photosynthesis. • Keeping the plant rigid (turgidity) • All the chemical reactions in the plant • To move dissolved minerals (nitrates) to cells © Boardworks Ltd 2003
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  © Boardworks Ltd2003