PhotosynthesisPhotosynthesis

By: Kenzy 8C By: Kenzy 8C

What is photosynthesis?

• Process plants use to make their own food

• Plants’ leaves contain chlorophyll• Chlorophyll (green color) makes

photosynthesis possible

The chlorophyll absorbs the sunlight.

Chloroplasts: Sites of Photosynthesis

• Photosynthesis– Occurs in chloroplasts, organelles in

certain plants– All green plant parts have chloroplasts

and carry out photosynthesis• The leaves have the most chloroplasts• The green color comes from chlorophyll in the

chloroplasts• The pigments absorb light energy

• In most plants, photosynthesis occurs primarily in the leaves, in the chloroplasts

• A chloroplast contains: – stroma, a fluid – grana, stacks of thylakoids

• The thylakoids contain chlorophyll– Chlorophyll is the green pigment that

captures light for photosynthesis

Photosynthesis occurs in chloroplasts

• The location and structure of chloroplasts

LEAF CROSS SECTION MESOPHYLL CELL

LEAF

Chloroplast

Mesophyll

CHLOROPLAST Intermembrane space

Outermembrane

Innermembrane

ThylakoidcompartmentThylakoidStroma

Granum

StromaGrana

The sunlight is combined with water, Carbon Dioxide and nutrients from the soil.

CO2

The chlorophyll processes the ingredients and makes sugarsugar (plant food) and oxygen.

SugarSugar + Air

O2

Plants and animals need each other to survive.

Animals including humans make the CO2 (carbon dioxide) plants need.They (the plants) make the O2 (oxygen) and food we need.

WHWHY ARY ARE PE PLANLANTS GTS GREREEN?EN?

It's not that easy bein' green Having to spend each day the color of the leaves When I think it could be nicer being red or yellow or gold Or something much more colorful like that…

Different wavelengths of visible light are seen by the human eye as different colors.

WHYWHY ARE ARE PLA PLANTS NTS GREGREEN?EN?

Gammarays

X-rays UV Infrared

Micro-waves

Radiowaves

Visible light

Wavelength (nm)

Why are plants green?

Reflected

light

Transmitted light

It's not that It's not that easy being easy being green… but green… but it is it is essential for essential for life on life on earth!earth!