WHAT SHOULD I KNOW ABOUT PHOTOSYNTHESIS



WHAT I SHOULD KNOW ABOUT PHOTOSYNTHESIS

What is an organism called that can make its own food? AUTOTROPH

Give an example of an autotroph: GREEN PLANTS

What is an organism called that CAN’T make its own food? HETEROTROPH

Give an example of an heterotroph: ANIMALS, HUMANS, FUNGI, MOST BACTERIA

How do animal cells store glucose for later? AS GLYCOGEN

How do plants store glucose for later? AS STARCH

Which molecule is used by living things to store and transfer energy? ATP

What are the parts of an ATP molecule?

A = ADENINE

B = RIBOSE SUGAR

C = PHOSPHATES

Write the equation that shows how ADP is changed into ATP.

ADP + P + energy → ATP

Cells STORE ENERGY by ADDING the P to ADP

Write the equation that shows how ATP is changed into ADP.

ADP + P + energy → ATP

Cells RELEASE ENERGY by REMOVING the P from ATP

How many Phosphate groups are attached to ADP? __2___

How many Phosphate groups are attached to ATP? 3____

What other carrier for high energy electrons helps with photosynthesis? NADPH

Write the equation that shows how NADP+ is changed into NADPH.

NADP+ + 2e- + H+ → NADPH

Cells CHARGE UP NADP+ to NADPH by adding electrons and hydrogen ions

Light

Be able to write the chemical equation for photosynthesis: 6 CO2 + 6 H20 → C6H12O6 + 6 O2

What are LIGHT ABSORBING molecules called? PIGMENTS

What is the main pigment used by green plants to absorb energy? CHLOROPHYLL

What are groups of light collecting pigments called? PHOTOSYSTEMS

Which wavelengths of light are best absorbed by chlorophyll? RED & BLUE-VIOLET

Which wavelengths of light are reflected by chlorophyll? GREEN

What other pigments do plants have? CAROTENOIDS (red, yellow, orange)

Why do plants have these other pigments besides chlorophyll?

THEY ABSORB OTHER WAVELENGTHS THAT CHLOROPHYLL CAN’T SO THEY HELP

CHLOROPHYLL USE MORE OF THE SUN’S ENERY

Why do trees change color in the fall? CHLOROPHYLL DISAPPEARS AND WE CAN SEE THE CAROTENOIDS THAT ARE USUALL HIDDEN

How do we see color? WE SEE REFLECTED LIGHT

Why do plants look green? CHLOROPHYLL REFLECTS GREEN LIGHT

Label the parts of a chloroplast and tell where the reactions for photosynthesis happen.

A = THYLAKOID SAC

B = STROMA

C = GRANUM

D = THYLAKOID SPACE

E = CYTOPLASM

What do we call proteins that help chemical reactions happen? ENZYMES

Which molecule makes ATP by adding a P onto ADP? ATP SYNTHASE

Where are the enzymes for the LIGHT DEPENDENT reactions located?

IN THE THYLAKOID MEMBRANE

Where are the enzymes for the LIGHT INDEPENDENT reactions located? IN THE STROMA

The LIGHT INDEPENDENT reactions are also called ? CALVIN CYCLE

Which reactions in photosynthesis require light? LIGHT DEPENDENT

Which reactions in photosynthesis do not require light? LIGHT INDEPENDENT (CALVIN CYCLE)

Which gas is given off by green plants during photosynthesis? OXYGEN (O2)

Which gas is used up by green plants during photosynthesis? CARBON DIOXIDE (CO2)

What do we call the molecules on the left hand side of a chemical equation? REACTANTS

What do we call the molecules on the right hand side of a chemical equation? PRODUCTS

What happens during the Light Dependent reactions?

PLANTS USE ENERGY FROM SUNLIGHT TO MAKE ATP & NADPH and GIVE OFF OXYGEN What are the REACTANTS in the light dependent reactions? WATER (H2O)

What are the PRODUCTS of the light dependent reactions? ATP, NADPH, OXYGEN (O2)

Which molecules produced by the light-dependent reaction are used during the Calvin cycle?

ATP & NADPH

What happens during the Calvin cycle?

PLANTS USE CO2, ATP, and NADPH TO MAKE GLUCOSE (C6H12O6)

What are the REACTANTS in the Calvin cycle? CO2, ATP, & NADPH

What are the PRODUCTS of the Calvin cycle? GLUCOSE (C6H12O6)

Where does the carbon(C) and oxygen (O) in glucose ultimately come from? FROM CO2

Where does the hydrogen (H) that ends up in NADPH ultimately come from? FROM H2O

Where does the hydrogen (H) in glucose ultimately come from?

FROM NADPH that got it from H2O

Which factors affect the rate of photosynthesis?

AMOUNT OF WATER, TEMPERATURE, and LIGHT INTENSITY

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