Photosynthesis and Respiration in plants

8/16/2019 Photosynthesis and Respiration in plants

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ScienceIndicator 1 and 2 – Second Term, 2016

Seventh gradeBoston International School


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What do plants eat?• Objective :To recognize that

altho gh in a di!erent "a#, theprocess o$ $eeding not onl# occ rs inh mans and animals, % t also inplants&

• Learning Objective: '(plains ho"the plants meet %asic $ nctions o$living things&


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Biblical Principle• God supplies our basic needs.• Genesis 9:33

'ver# moving thing that lives shall %e$ood $or #o & I have given #o allthings, even as the green her%s&


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What do plants eat?

• )lants ma*e their o"n $ood – in the$orm o$ s gars – sing "ater, car%ondio(ide, and s nlight&

• So "hat is the +$ood that people addto plants? It-s $ertilizer&

• .ertilizer is a mi(t re o$ minerals, s chas potassi m, calci m,and phosphor s&It helps plants to gro", % t doesn-ts ppl# them "ith energ# as $ood does&


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)hotos#nthesis• It is the process %# "hich a cell

capt res energ# in s nlight and sesit to ma*e $ood&

• )lants ma*e their o"n $ood thro ghthe process o$ photos#nthesis&

• /n organism that ma*es its o"n $oodis called a prod cer or anautotroph. /n organism that cannotma*e their o"n $ood is called acons mer, or a heterotroph.


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What happens d ringphotos#nthesis?

• ring photos#nthesis plants a%sor%energ# $rom the s n and se it toconvert car%on dio(ide and "aterinto s gars and o(#gen&

• The photos#nthesis has t"o stages:.irst, plants capt re the s n-s energ#&Second, plants prod ce s gars&


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Stage 1: apt ring the S n-senerg#&

• This process occ rs mostl# in the leaves&ecall that chloroplasts are green

organelles inside plants cells& The green

color comes $rom pigments, coloredchemical compo nds that a%sor% light&

The main pigment $or photos#nthesis inchloroplasts is chloroph#ll&

• So chloroph#ll capt res light energ# andconverts it to a $orm that is sed in thesecond stage&


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• ring stage 1, "ater in thechloroplasts is split into h#drogenand o(#gen& The o(#gen is given o!as a "aste prod ct&


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hloroplast


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Stage 2: 3sing energ# toma*e $ood

• In this stage cells prod ce s gars&ells se h#drogen 45 that came

$rom splitting o$ "ater in stage 1,car%on dio(ide $rom the air, and theenerg# $rom the s n to ma*e s gars,one o$ them is 7l cose&

• ells se the energ# in gl cose tocarr# o t vital cells $ nctions&


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What happens to the s garsprod ced in photos#nthesis?

• )lants cells se some o$ the s gars $or $ood& The cells %rea* do"n these molec les in aprocess that releases energ#& This energ#

can then %e sed to carr# o t the plants$ nctions s ch as gro"ing and ma*ing seeds&• 8ther s gar molec les ma# %e stored in the

plant-s cells $or later se& When #o are

eating $ood $rom plants, s ch as potatoes orcarrots, #o are eating the plant-s storedenerg#&


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• St d# $or iz: ;a# th

Bl e• ;a# 11th 12th 4>th ed


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espiration in plants• )lant cells respire – the# give o t

car%on dio(ide and a%sor% o(#gen$rom the air that s rro nds them&

• Their tiss es respire = st as animaltiss es do& )lants, ho"ever, don-thave l ngs or a %lood stream, so "ecannot sa# the# %reathe in the same"a# as animals&


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• )hotos#nthesis does the opposite o$respiration& ar%on dio(ide is a%sor%edand o(#gen is prod ced&

• /ll the parts o$ the plant respire, theleaves, the stem, roots, and the @o"ers&

The parts a%ove the soil get their o(#gendirectl# $rom the air thro gh pores& Thepores in the leaves are called stomata 4sing lar: stoma & The pores in the%ranches are called lenticels &


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/ plant respires all the time, da# andnight, % t photos#nthesizes onl# inthe presence o$ s nlight&

In respiration, plants convert thes gars %ac* into energ# $or gro"thand other li$e processes and releaseenerg#, car%on dio(ide, and "ater&


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https:AA"""o t %e&comA"atch?v Ilmg.Cm%/3g

https://www.youtube.com/watch?v=IlmgFYmbAUghttps://www.youtube.com/watch?v=IlmgFYmbAUg


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Photosynthesis and Respiration in plants

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