PHOTOSYNTHESISAutotrophic nutrition!

Auto = self

Troph = nurish

Autotrophs

• Autotrophs – organism capable of producing its own food; plants!

• Sometimes referred to as producers

Autotrophs

• Examples: flowers, plants,trees, fruits,vegetables

Heterotrophs

• Heterotroph - Organisms that cannot make their own food, they need to consume it

• Also called CONSUMERS• Hetero = other

• Examples: animals, fungus, some bacteria

Autotrophic Nutrition

• PHOTOSYNTHESIS: light energy from the sun is changed into chemical energy in the form of glucose in plants

Photosynthesis

Chemosynthesis

• CHEMOSYNTHESIS - process by which some organisms, like certain bacteria, use chemical energy to produce carbohydrates

• http://www.bbc.co.uk/nature/habitats/Hydrothermal_vent#p004htvq

CHEMICAL FORMULA FOR

PHOTOSYNTHESISSunlight +

CO2 + H20

Ingredients

Raw Materials

Reactants

End Products

C6H12O6 + O2

ENERGY + Carbon Dioxide

+WaterGlucose + Oxygen

Summary of Photosynthesis

• Light energy is absorbed by the CHLOROPLAST• Energy is used to make oxygen and glucose from the raw materials of CO2 and H2O

• Glucose – C6H12O6 - sugar molecule produced by photosynthesis

• GLUCOSE provides all of our cells with energy!!

• C6H12O6

Process of Photosynthesis

1. Sunlight is made up of many different colors of light.

2. These colors make up the visible light of the ELECTROMAGNETIC SPECTRUM

•There are 7 colors in the electromagnetic spectrum

•ROY G BIV

•RED•ORANGE•YELLOW•GREEN•BLUE•INDIGO•VIOLET

•RED and BLUE wavelengths are the most effective colors of light for photosynthesis

•CHLOROPHYLL is a green pigment in plants that absorbs the light that is needed for photosynthesis

Absorption of Light by Chlorophyll

Why are plants green?

• Yes they have chlorophyll…the green pigment• Then why is chlorophyll green?!

Where does photosynthesis happen?

● in the LEAF of the plant, there are

organelles called CHLOROPLASTS

Two sets of reactions in Photosynthesis

• First Reaction –

• Takes place in Grana or Thylakoids

• These reactions are called light dependent or photochemical

First Reaction

• In this part of the chloroplast, light splits water (H2O) into HYDROGEN and OXYGEN

• The HYDROGEN stays inside the chloroplast but the OXYGEN leaves the plant and this is the oxygen that we breathe in!!

Second Reaction

• The second reaction takes place in the STROMA (liquid part of the chloroplast)

• This is where the CALVIN CYCLE takes place. It is also known as LIGHT INDEPENDENT, or DARK REACTION.

• Calvin Cycle – process in stroma of plants where carbon enters as CO2 and leaves as glucose; light independent reaction.

Second Reaction

● Here CARBON DIOXIDE combines with

HYDROGEN from the light reactions to make

GLUCOSE

● The GLUCOSE is stored in the plant for use as

energy for life processes.