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Science

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
Enzyme   Proteins made by living cells, arebiological catalysts, break down molecules, build up molecules, they have an active site that only substrate can fit in.  
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Stomata   Tiny holes where gas exchange occur  
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Guard Cells   Cells that can chnage shape and open or close the stomata  
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Phloem   Tubes that take glucose formed during photosynthisis to other parts of the plant  
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Xylem   Vessels that bring water to the leaf from the soil.  
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Chlorophyll   Green substanceinside leaf that traps energy from the light.  
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Spongy mesophyll   Irregular-shaped cells thatprovide airspaces that allow gases todiffuse to andfrom cells.  
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Pallisade mesophyll   The layer near the top of the leaf so that the pallisade cells get plenty of light. Pallisade cells contain lots of chloroplasts forphotosynthisis.  
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Cuticle   A waxy layer that prevents water being lost from the top of the leaf  
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Lower Epidermis   Thin layer that supports bottom of leaf.  
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Upper epidermis   Thin layer that supports the top of the leaf.  
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Photosynthisis   Photo=Light Synthisis= To make Can only take place during the day. Carbon dioxide + Water ---> Glucose + Oxygen 6CO2 + 6H2O ---> C6H12O6 + 6O2  
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Calcium   Maintain strong bones, also needed for muscles andnerves to function properly. Found in dairy and fish  
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Iron   Is needed tomake haemoglobin which is in the red blood cell. Found in red meat and dark green veges.  
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Vitamin D   Is needed toenable calcium to be absorped bythe gut. Rickets:Weak bones and teeth.  
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Vitamin C   Protects cells from damage production of collagen that helps wounds to heal, also helps absorption of iron from plant foods. Scurvy: Fatigue, swollen gums,loss of teeth etc. Found in Citrus fruits.  
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Proteins   Chemical makeup of carbon,hydrogen, oxygen, nitrogen, (CHON)gives some energy, important for building new cells, making enzymes and defending us against disease. Made up of amino acids. Protein = Biuret = Purple  
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Lipids   Chemical make up, carbon, hydrogen, oxygen (CHO). Also provide energy ( More than carbohydrates) insulation. Made up of simple sugars. Fats = Ethanol = Milky White  
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Carbohydrates   Chemical makeup of carbon, hydrogen, oxygen ( CHO) Main source of energy. Made up of fatty acids and glycergol. Starch= Iodine = Blue-Black Glucose = Heat = Brick red-Orange  
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Denatured   Enzymes altered by heat causing change in shape.  
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Catalysts   Is a substance that speeds up chemical reactions without being used up.  
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Active Site   Only certain molecules (Substrate)can fit into in order to react  
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Semi-permeable membrane   Allows only some substances through  
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Flaccid   When cell is not completely full with water  
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Turgid   When cell is full with water.  
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Diffusion   The movement of molecules from an area of high concentration to an area of low concentrations.  
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Osmosis   Diffusion of water  
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Nucleus   Contains genetic material that carries the instructions that control the structure and activities of the cell. (Found in animal and plant cells)  
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Cytoplasm   Contains the cell organelles (Found in animal and plant cells)  
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Cell membrane   Controls passage of substances into andout of cell (Found in animal and plant cells)  
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Cell Wall   A rigid wall that gives shape to plant cells (Found in plant cells only)  
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Vacuole   Contains water and dissolved substances and keep the pressure in plant cells. (Animals may contain small vacuole) (Found in plant cells only)  
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Chloroplasts   Where photosynthisis takes place (Found in plant cells only)  
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Transpiration   Water evaporates from mesophyll cell surface forming water vapour which can leave through the stomata  
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Stamen   The male part of the flower which consists of the anther and the filament  
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Filament   Supports the anther  
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Anther   Produces the pollen  
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Sepal   Protects the flower when it is bud  
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Petals   Attracts insects for pollination  
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