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• I will be able to:
• Explain what photosynthesis is.
• Explain what happens during photosynthesis.
• I will be able to:
• Explain what photosynthesis is.
• Explain what happens during photosynthesis.
PhotosynthesisPhotosynthesis
Cells and Heredity 2.1
P44-49
Cells and Heredity 2.1
P44-49
• The Sun as an Energy Source.– Nearly all living things obtain energy either
directly or indirectly from the energy captured from the sun during photosynthesis.
Objective: I will be able to explain How Living Things Get Energy from the Sun.
Zebra- eat grass, it gets energy that was stored in the grass from the sun.
Lion- eats the zebra which has stored energy from the
sun.
• The Sun as an Energy Source.– Photosynthesis- the
process in which a cell captures sunlight and uses it to make food.
• Photo- Greek for “light”
• Syn “ putting together”
Objective: I will be able to explain How Living Things Get Energy from the Sun.
• The Sun as an Energy Source.– Producers and Consumers
• Producers- Plants make their own food through photosynthesis, called autotrophs.
• Consumers- heterotrophs- obtain food by eating other organisms, or by absorbing their food from other organisms (fungi)
Objective: I will be able to explain How Living Things Get Energy from the Sun.
• During Photosynthesis, plants and some other organisms absorb energy from the sun and use energy to convert carbon dioxide and water into sugars and oxygen.– Stage 1: Capturing the Sun’s
Energy– Stage 2 Using Energy to
Make Food
Objective: I will be able to explain What Happens During Photosynthesis.
• Stage 1: Capturing the Sun’s Energy– Energy is captured, mostly occurs in the leaves of
plants.– Takes place in the chloroplast contains chlorophyll.– Chlorophyll- green pigment made of colored chemical
compounds that absorb light.
Objective: I will be able to explain What Happens During Photosynthesis.
• Stage 1: Capturing the Sun’s Energy– Functions as something
like solar cells, it captures light energy and converts it into a form that is used in the second stage.
– Water in the chloroplasts is split into hydrogen and oxygen.
– Oxygen is given off as a waste product.
Objective: I will be able to explain What Happens During Photosynthesis.
• Stage 2 Using Energy to Make Food– Cells produce sugars.
– Cells use the hydrogen that came from the water in stage 1.
– Cells also use carbon dioxide from the air that passes through openings in the leaf.
Objective: I will be able to explain What Happens During Photosynthesis.
• Stage 2 Using Energy to Make Food– Powered by the energy captured in stage
1, the H and CO2undergo a series of reactions that results in the formation of sugars. Glucose is a sugar written: C6H12O6.
– Cells use the energy to carry out cell functions.
– Waste product is oxygen- leaves through openings in the leaf.
Objective: I will be able to explain What Happens During Photosynthesis.
• Photosynthesis Equation (chemical)– Light Energy + CO2 + H2O C6H12O6 + O2
• Raw materials-CO2 + H2O
• Yields ( equals or produces) • Products- C6H12O6 + O2
• Energy is used in the reaction, therefore it is written in on the left side.
Objective: I will be able to explain What Happens During Photosynthesis.
• Photosynthesis Equation.
Objective: I will be able to explain What Happens During Photosynthesis.
• Photosynthesis Equation.– Some are made into
other compounds- cellulose for cell walls (think active transport)
– Stored in cells for later use.
– When eating plants, you are eating stored energy.
Objective: I will be able to explain What Happens During Photosynthesis.