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Using Models To Understand Photosynthesis Biology Worksheets

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Using M odels t o U nderstand P hotosynthesis

During p hotosynthesis, p lants u se c arbon d ioxide, w ater, a nd t he e nergy i n s unlight t o p roduce o xygen

plus s ugar m olecules w ith h igh s tored c hemical e nergy. T hus, p hotosynthesis c onverts l ight e nergy t o

stored c hemical e nergy.

A s cientific m odel i s a s implified r epresentation o f r eality t hat h ighlights c ertain k ey f eatures o f a

structure, p rocess o r s ystem. A g ood m odel h elps u s t o u nderstand a p rocess s uch a s p hotosynthesis.

A c hemical e quation i s o ne t ype o f m odel o f p hotosynthesis. I n t he b ox b elow, t he f irst v ersion o f t he

chemical e quation f or p hotosynthesis s hows t he c hemical f ormula f or e ach t ype o f m olecule, a nd t he

second v ersion s hows d iagrams o f t he s tructure o f e ach t ype o f m olecule. N otice t hat t he a toms i n t he

a nd H

O m olecules a re r eorganized a s a toms i n O

and C

( the s ugar g lucose). A lthough t he

atoms s tay t he s ame, t he p roduct g lucose h as m ultiple C -‐C a nd C -‐H b onds w hich h ave h igher s tored

chemical e nergy t han t he C =O a nd O -‐H b onds i n t he i nput C O

a nd H

Photosynthesis

s unlight

6 C O

+ 6 H

O 6 O

+ C

s unlight

1. D uring b iological p rocesses, e nergy c an b e c onverted f rom o ne t ype t o a nother, b ut e nergy i s n either

created n or d estroyed. D uring p hotosynthesis, w hat h appens t o t he e nergy i n s unlight? B e s pecific.

2. T he c hart b elow s hows a nother t ype o f m odel o f p hotosynthesis. T his m odel e mphasizes t hat:

•

One t ype o f e nergy i s c onverted t o a nother t ype o f e nergy.

•

Matter i s c onverted t o m atter; i .e. a toms i n t he i nput m olecules a re r eorganized a s a toms i n t he

output m olecules.

•

Energy i s n ot c onverted t o m atter o r v ice v ersa.

Complete t his c hart t o s how t he c hanges d uring p hotosynthesis.

Photosynthesis

Energy I nput

Energy O utput

>>>>>>>>>>>>>>

Matter I nputs

Matter O utputs

Using Models To Understand Photosynthesis Biology Worksheets