Opener, Tuesday, 9/25 Please write the questions & your answers in your notebook.Please write the questions & your answers in your notebook. 1. What do the following have in common: –Solar-powered calculator –Solar-powered street light –Oak tree 2. What do your cells use ATP for?

4.2 KEY CONCEPT The overall process of PHOTOSYNTHESIS produces sugars that store chemical energy. Glucose molecule

Energy, we all need it to survive!!!

Why are producers important to the stability of all the ecosystems on the planet?

Photosynthesis: Process--sunlight (solar energy) chemically converts water & carbon dioxide into chemical energy, stored in simple sugars (glucose)!!!

Write this on back!!! Write this on back!!! 2 parts of photosynth.: 1.Light-dependent reactions – thylakoidsthylakoids chlorophyll (green pigment, in chloroplast) absorbs solar energy.chlorophyll (green pigment, in chloroplast) absorbs solar energy. Water molecule splits  Oxygen releasedWater molecule splits  Oxygen released Solar energy transferred to “energy storing” molecules: ATP, NADPHSolar energy transferred to “energy storing” molecules: ATP, NADPH

2 parts of photosynth., cont.: 2.Light-independent reactions – StromaStroma CO 2 from air into cellCO 2 from air into cell Combines w/ATP & NADPH from #1 Combines w/ATP & NADPH from #1  to “Calvin Cycle” reactionsto “Calvin Cycle” reactions Produces sugar (ex.-glucose) that now stores the sun’s energy!Produces sugar (ex.-glucose) that now stores the sun’s energy!

Turn to p. 104, fill out diagram on your sheet!

Light-DependentRxns Waste product Light- Independent Rxns Product SunlightChloroplast 6 H 2 O Thykaloid Chlorophyll 6 O 2 Energy (ATP, NADPH) 6 CO 2 Calvin Cycle (in stroma) (in stroma) 6-C sugar 6-C sugar (Glucose: C 6 H 12 O 6 )

What are the reactants of photosynthesis?What are the reactants of photosynthesis? Water, sunlight, carbon dioxideWater, sunlight, carbon dioxide What are the products of photosynthesis?What are the products of photosynthesis? Oxygen, sugarOxygen, sugar What organelle does all this magic?What organelle does all this magic? ChloroplastChloroplast Name some examples of organisms that can do photosynthesis.Name some examples of organisms that can do photosynthesis.

6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 C 6 H 12 O 6 granum (stack of thylakoids) thylakoid sunlight 1 six-carbon sugar 6H 2 O 6CO 2 6O 2 chloroplast energy stroma (fluid outside the thylakoids) Sunlight & Enzymes #1-4 correspond to p.105 description!...Homework!!...Homework!!

Light-dependent reactions –thylakoids –Water & sunlight needed –chlorophyll absorbs energy –energy is transferred along thylakoid membrane then to light-independent reactions –O 2 released!

Light-independent –take place in stroma –needs carbon dioxide from atmosphere –use energy to build a sugar in a cycle of chemical reactions

@ Bottom of Sheet... Whatcha Think?? The ultimate source of energy for most life on Earth isThe ultimate source of energy for most life on Earth is –The SUN!!!! –The SUN!!!! What’s it needed for in photosynthesis?What’s it needed for in photosynthesis? –Must have the sun’s energy to make ATP/NADPH so they can then make glucose What do plants use glucose for?What do plants use glucose for? –Energy for chemical reactions! What do we use glucose for?What do we use glucose for? –ENERGY for chemical reactions!! What waste product of photosynthesis is vital to our survival?What waste product of photosynthesis is vital to our survival? –Oxygen!!!

Lab: Analyzing Photosynthesis SAFETYSAFETY –VERY important, let’s review— -Eating/drinking? Horseplay? Chatting? Following instructions? Bromothymol blue is a pH indicator, it makes the solution blue if the pH is neutral (7). However, in acidic solutions, the BTB causes a color change from blue to yellow.Bromothymol blue is a pH indicator, it makes the solution blue if the pH is neutral (7). However, in acidic solutions, the BTB causes a color change from blue to yellow. Carbon dioxide is a gas that when dissolved in a solution causes the solution to be acidic.Carbon dioxide is a gas that when dissolved in a solution causes the solution to be acidic. –This is happening in our oceans! It’s called “ocean acidification”. –Where do you think that CO 2 is coming from?! –What do you think it might be doing to the coral reefs and shelled creatures?

LAB: Calorimetry Say WHAT??Say WHAT?? –Ties in calories & energy to the producers that give it to us...through photosynthesis! Let’s Read it together!Let’s Read it together! –Introduction...helps YOU understand WHY we’re doing it –Objective...the POINT of the lab –Materials...I’ve collected them for you –Materials...I’ve collected them for you –SAFETY —SUPER-IMPORTANT IN TODAY’S LAB, ABSOLUTELY NO HORSEPLAY—YOU MUST FOLLOW ALL DIRECTIONS AND YOU MUST STAY SEATED WITH YOUR GROUP FOR THE ENTIRE LAB. –NO EXCEPTIONS!