Do now activity How come animals do not need to do photosynthesis? Where does photosynthesis happen in plant cells? Name 2 things that plants produce from photosynthesis. What type of macromolecule do plants produce from photosynthesis?

Section 2-1: Photosynthesis Essential Question: What do plants use for photosynthesis? What do they make? Section 2-1: Photosynthesis Learning Target Use a model to illustrate how photosynthesis transforms light energy into stored chemical energy.

announcements Section 2 Test Scheduled for this Friday: 6/8/18 Section 2 Stamp Sheet due Friday 6/8/18 Class Syllabus due Friday 6/8/18 Pink Document due Friday 6/8/18

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Autotrophs: organisms that can make their own food (producer) Overview Autotrophs: organisms that can make their own food (producer)

overview Autotrophs (producers) “produce” their own food using energy from the sun. _______ are autotrophs. In the blank: plants Example: Plants! They use sunlight, water and CO2 to make energy and oxygen… PHOTOSYNTHESIS PLANTS

overview Photosynthesis -- plants convert sunlight into sugar photo = light synthesis = to make

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Photosynthesis equation light 6CO2 + 6H2O  C6H12O6 + 6O2 carbon dioxide + water  glucose + oxygen

Photosynthesis equation Photosynthesis the process that uses energy from sunlight to transform ________ _____________ and ________ into ___________ and ___________ Carbon Dioxide Water Carbon dioxide, water, oxygen, carbohydrates Oxygen Carbohydrates

Photosynthesis equation Uses Light energy carbon dioxide (CO2) water (H2O) Makes oxygen (O2) glucose (C6H12O6)

Stomata = “mouth”

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Light & pigments Plants have pigments

Pigments: light absorbing molecules that capture the sun’s energy Light & pigments Pigments: light absorbing molecules that capture the sun’s energy

Light & pigments Pigments: light absorbing molecules that capture the sun’s energy We can see reflected light. We cannot see absorbed light.

ROY G BIV Shortest wavelength = larger amount of energy Longest wavelength = Least amount of energy Shortest wavelength = larger amount of energy

Plants look green because chlorophyll reflects green light.

Chlorophyll is a pigment found in __________ Light & pigments Chlorophyll is a pigment found in __________ PLANTS plants

Chlorophyll makes plants ________ . Light & pigments Chlorophyll makes plants ________ . GREEN green

Light & pigments 2 types: Chlorophyll a Chlorophyll b

Light & pigments GREEN These pigments absorb red and blue light well. They do not absorb _______ light very well. Pigments Include: chlorophyll a chlorophyll b absorbs well in red and blue but poorly in green plants also have red , yellow and orange pigments that absorb other colors energy is transferred to electrons in pigments when they absorb sunlight GREEN

Is the color green being reflected or absorbed by plants?

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Photosynthesis takes place in the chloroplasts of plants Inside a chloroplast Photosynthesis takes place in the chloroplasts of plants

Inside a chloroplast Chloroplasts have two parts: thylakoids: saclike membranes found in chloroplasts Many thylakoids = grana pigments capture sunlight (light-dependent reactions)

Inside a chloroplast Chloroplasts have two parts: Stroma: space surrounding the thylakoids (Calvin cycle)

The chloroplast

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Do now activity What are the 2 parts of the chloroplast? What reaction takes place in each part of the chloroplast? What gives plants their color? What does it reflect? What does it absorb? Write out the photosynthesis equation.