Unit 3 Cells Ch. 8 Photosynthesis. Autotrophs & Heterotrophs o Plants & some other types of...
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Transcript of Unit 3 Cells Ch. 8 Photosynthesis. Autotrophs & Heterotrophs o Plants & some other types of...
Unit 3 CellsUnit 3 Cells
Ch. 8 PhotosynthesisCh. 8 Photosynthesis
Autotrophs & Heterotrophs
Plants & some other types of organisms are able to use light energy from the sun to produce food
Autotrophs - organisms, (such as plants), that can make their own food
Autotrophs & Heterotrophs
Heterotrophs - obtain energy from the foods they consume (eat)
Chemical Energy & ATP
Living things use chemical fuels as well Adenosine triphosphate (ATP) - one of
the principal chemical compounds that cells use to store & release energy
Investigating Photosynthesis
Photosynthesis - process where plants use energy of sunlight to convert water & carbon dioxide into high-energy carbohydrates (sugars & starches), & oxygen (waste product)
The Photosynthesis Equation
6CO2 + 6H2O (light) C6H12O6 + 6O2
Carbon dioxide + water (light) sugars + oxygen
Light & Pigments
In addition to water & carbon dioxide, photosynthesis requires light & chlorophyll, a molecule in chloroplasts
Pigments - light-absorbing molecules that gather the sun’s energy
Chlorophyll - the plants principle pigment 2 main types: chlorophyll a & chlorophyll b
Inside a Chloroplast
Photosynthesis takes place in chloroplasts Thylakoids - saclike photosynthetic membranes
where chlorophyll & other pigments are organized into clusters of photosystems
Photosystems - the light-collecting units of the chloroplast
Factors Affecting Photosynthesis
Water is a raw material of photosynthesis, a shortage could slow or stop photosynthesis
Light is required for photosynthesis It also depends on enzymes which only function
between 0 & 35C Temps above or below this range may damage the
enzymes, slowing the rate of photosynthesis