Photosynthesis Energy where do we get it Review

Energy: where do we get it? Review: Proteins, lipids, and carbs store energy in

Producers (aka autotrophs = “self– eat”) get their energy from the sun. Producers

Reaction Types Chemical reactions can be: EXERGONIC – release energy (exer = “exit” =

Photosynthesis In the process of photosynthesis, plants use the energy in sunlight to make

Sources of Energy Nearly all living things obtain energy either directly or indirectly from

How Living Things Use Energy From the Sun Autotroph Directly Heterotroph Indirectly

Photosynthesis is a process. During photosynthesis, plants and some other organisms use energy from

Sequencing Sequence is the order in which the steps in a process occur. Create

How do plants get the raw materials needed for photosynthesis? The cell needs two

Carbon dioxide enters the plant through small openings (stomata) on the undersides of

Chloroplasts The chloroplasts in plant cells give plants their green color. The green color

Chloroplasts Once in the leaves, the water and carbon dioxide move into the chloroplasts.

Plant cells use sugar food and to make other compounds, such as cellulose.

The Two Stages of Photosynthesis During photosynthesis, plants and some other organisms use energy

- Respiration After completing the Power. Point and questions, go to the following website:

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Photosynthesis

Energy: where do we get it? Review: Proteins, lipids, and carbs store energy in bonds We digest the food and break the bonds to release energy But where do we GET food to begin with? ? ?

Producers (aka autotrophs = “self– eat”) get their energy from the sun. Producers convert this light energy into stored chemical energy (glucose). This process is called photosynthesis.

Reaction Types Chemical reactions can be: EXERGONIC – release energy (exer = “exit” = energy leaves) ENDOGONIC – absorb energy (endo = “into” = energy enters)

Photosynthesis In the process of photosynthesis, plants use the energy in sunlight to make food. Because the energy goes into the system, photosynthesis is ENDOGONIC.

Sources of Energy Nearly all living things obtain energy either directly or indirectly from the energy of sunlight captured during photosynthesis.

How Living Things Use Energy From the Sun Autotroph Directly Heterotroph Indirectly

Photosynthesis is a process. During photosynthesis, plants and some other organisms use energy from the sun to convert (change): • carbon dioxide (CO 2) and water (H 2 O) into • oxygen (O 2) and sugar (C 6 H 12 O 6)

Sequencing Sequence is the order in which the steps in a process occur. Create a flowchart that shows the steps in photosynthesis. Put each step in a separate box in the flowchart in the order in which it occurs. Steps in Photosynthesis Sunlight strikes leaf. Chlorophyll captures light energy. Cells use the energy to produce sugars and oxygen from water and carbon dioxide.

How do plants get the raw materials needed for photosynthesis? The cell needs two raw materials for stage 2: water (H 2 O) and carbon dioxide (CO 2). Plant roots absorb water from the soil, and the water then moves up to the leaves. (CAPILLARY ACTION!!!)

Carbon dioxide enters the plant through small openings (stomata) on the undersides of the leaves.

Chloroplasts The chloroplasts in plant cells give plants their green color. The green color comes from pigments, colored chemical compounds that absorb light. The main pigment in chloroplasts is chlorophyll. Chlorophyll captures light energy and uses it to power photosynthesis to produce sugars.

Chloroplasts Once in the leaves, the water and carbon dioxide move into the chloroplasts. Inside, the water and carbon dioxide undergo a series of reactions and produce two important products of photosynthesis: sugar and oxygen.

Chloroplasts

Plant cells use sugar food and to make other compounds, such as cellulose. (-ose = sugar!!!) Plant cells also store sugar for later use. Oxygen exits the leaf through the stomata. Almost all of the oxygen in Earth’s atmosphere was produced by living things through photosynthesis!

The Two Stages of Photosynthesis During photosynthesis, plants and some other organisms use energy from the sun to convert carbon dioxide and water into oxygen and sugars.

- Respiration After completing the Power. Point and questions, go to the following website: http: //studyjams. scholastic. com/studyjams/science/plant s/photosynthesis. htm Test yourself! Remember, frequent review is THE BEST way to meet with success!