• 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.