Photosynthesis_ppt - Photosynthesis Life from Light and Air...

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Photosynthesis: Life from Light and Air
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Energy needs of life • All life needs a constant input of energy – Heterotrophs (Animals) • get their energy from “eating others” – eat food = other organisms = organic molecules • make energy through respiration – Autotrophs (Plants) • get their energy from “self” • get their energy from sunlight • build organic molecules (food) from CO 2 • make energy & synthesize sugars through photosynthesis
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Energy needs of life – Heterotrophs • consumers •an ima ls • fungi • most bacteria – Autotrophs • producers •p lan ts • photosynthetic bacteria (blue-green algae)
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How are they connected? glucose + oxygen carbon + water + energy dioxide C 6 H 12 O 6 6O 2 6CO 2 6H 2 OA T P ++ + Heterotrophs + water + energy glucose + oxygen carbon dioxide 6CO 2 6H 2 O C 6 H 12 O 6 6O 2 light energy + Autotrophs making energy & organic molecules from light energy making energy & organic molecules from ingesting organic molecules Where s the ATP? exergonic endergonic
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H 2 O Energy cycle Photosynthesis Cellular Respiration sun glucose O 2 CO 2 plants animals , plants ATP The Great Circle of Life,Mufasa!
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N P K H 2 O What does it mean to be a plant • Need to… – collect light energy • transform it into chemical energy –store light energy • in a stable form to be moved around the plant & also saved for a rainy day – need to get building block atoms from the environment • C,H,O,N,P,K,S,Mg – produce all organic molecules needed for growth • carbohydrates, proteins, lipids, nucleic acids ATP glucose CO 2
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Plant structure • Obtaining raw materials – sunlight • leaves = solar collectors –CO 2 • stomates = gas exchange –H 2 O • uptake from roots – nutrients • N, P, K, S, Mg, Fe… • uptake from roots
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stomate transpiration
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Photosynthesis_ppt - Photosynthesis Life from Light and Air...

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