INTRODUCTION

Question 1

Photosynthesis

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All living organisms require energy to survive. This energy comes from the breakdown of glucose in a

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process called

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respiration. Plants and animals differ in how they obtain this glucose

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Plants are able to utilise light energy to make their own food. They do this by converting the raw

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materials of carbon dioxide and

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immediately into

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water to glucose (sugar). The

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alucase

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St arch_- Storage

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is usually converted

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chloroplasts

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This

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process is called _pho os une thesis and it takes place in the leaves as they have the green pigment called

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Chlomphil which traps light energy from the sun and this is needed to drive the process. Oxygen is a

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waste product which is released back into the atmosphere.

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to thermity reaction - aS

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This process is summarised in Fig. 1

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in do Enermit.hay Leapire right

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green

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Crom SwAY 0 CMG

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water

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Ligh

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Piment

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SILICOSE

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Al 470 pl

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in ch iDroprast

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338

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But ricers LA

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Carbon

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OxYgen

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dioxide

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LIQhY

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o 6 Con 4-6H20 9 Cato m19 06

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chlorophyll

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Word equation for photosynthesis:

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lignt energy

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L #t boy

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Carbon dioxide +

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water

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glucose +

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oxygen

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Balance symbol equation G Coz

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1412 06

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2

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640

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6

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0

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diNte

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6 60 2

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(ot

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evaporation of

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L

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woZy

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Mayer -groves toors as depende