Do Now Compare nutrition in autotrophs and heterotrophs. Autotrophs can make their own food in the form of glucose; heterotrophs must ingest or absorb their food. Identifytwo organelles present in autotrophs that are not present in heterotrophs. Chloroplasts and cell walls
Objective:What are theinorganic andorganicmoleculesinvolved inphotosynthesis?
Energy used in all organismscomes from the sun. Autotrophstake the sun’s energy and create glucose (sugar). Heterotrophs eat those plants and their sugar. Other heterotrophs eat those organisms and that energy, too!
What is a photon? Photon A unit of light energy Measurable energy in the form of lightPhotons are to light what pounds are to weight
Recall – Define synthesis The process of creating molecules, structures Building larger molecules from smaller building blocksEx: taking simple sugars and making starch
Put them together! Photon + synthesis=PHOTOSYNTHESIS
Photosynthesis Only occurs in autotrophs at the chloroplasts Uses the sun’s light energy to make carbohydrates These organisms are making their own food Only certain organisms can carry out photosynthesis 1. plants 2. certain species of bacteria 3. certain species of protists
Scientists wondered for years... How could a little seedling sprout into a tree? Where did the plants get the materials, nutrients from?
Your Task Split into pairs and read about three scientific experiments 1. Determine their conclusions based on the evidence and observations provided. 2. Predict the formula for photosynthesis.
Experiment 1: Jan Van HelmontBackground Information: It was hypothesized that plants used parts of the soilProcedure: Measure seed’s and soil’s initial masses Water a plant regularly for 5 yearsObservation: Seed’s mass = 0.005 kg; 5 years later - tree’s mass = 75 kg Soil’s mass remained unchangedConclusion: Plants use water to build some of theirstructures!
Experiment 2: Joseph PreistleyBackground Information: Fires burn as long as they have oxygen suppliesProcedure: Lit a candle and placed a glass jar over it Lit a candle with a plant beside it; placed a jar over itObservation: The candle stayed lit in the jar with the plant, but went out without in the jar without the plant.Conclusion: Plants release oxygen!
Experiment 3: Joseph PriestleyBackground Information: From experiment 2: after 10 days plant started to die Animals breathe out carbon dioxide.Procedure Placed a mouse in a sealed container with “used air” Placed a mouse and a plant in a sealed container with “used air”Observations Mouse without plant died in 5 seconds Mouse with plant livedConclusion: Plants use carbon dioxide and release oxygen
Part 2: DirectionsKnowing that plants can make their own food inthe form of glucose, predict the full formula forphotosynthesis using the conclusions from theprevious experiments.Raw Materials Products(what is needed) (what is produced)_________ + ________ glucose + _________
Photosynthesis: In the presence oflight, plants transform carbondioxide and water intocarbohydrates and oxygen
Regents ReviewPhotosynthesis is the process by which1. the potential energy of simple sugars is transferred to ATP molecules2. simple sugars are gradually broken down to form lactic acid or alcohol3. two simple sugar molecules combine to form maltose and water4. light energy is converted into the chemical energy of simple sugars
Regents ReviewThe mass of some corn plants at the end of theirgrowth period was 6 tons per acre. Most of this masswas produced from1. water and organic compounds absorbed from the soil2. minerals from the soil and oxygen from the air3. minerals and organic materials absorbed from the soil4. water from the soil and carbon dioxide from the air
Regents reviewEating a sweet potato provides energy for humanmetabolic processes. The original source of thisenergy is1. the energy in protein molecules stored within the potato2. from starch molecules absorbed by the potato plant3. made available by photosynthesis4. in vitamins and minerals found in the soil
Regents Review Identifythe organic molecule created during photosynthesis. Glucose – C6H12O6 Identifythe inorganic reactants needed for photosynthesis to occur. H2O and CO2