Ch. 9-2 Photosynthesis Flashcards
to study for Sem II Bio final (25 cards)
What makes life on earth possible?
the Sun and photosynthesis
In what form does energy travel from the sun to the Earth?
light
Can humans see all the light the sun gives?
No
compounds that absorb light
pigments
What do plants use pigments for?
Capturing the energy in sunlight
Main pigment in green plants. How many types
chlorophyll
2 types of it
Why do plants appear green?
Chlorophyll does not absorb green light and reflects it
name for all pigments besides chlorophyll
accessory pigments
Why don’t we see the other colors on leaves most of the year? Why do we see them in the fall?
The chlorophyll’s green overwhelms the green the accessory ones.
When the temperature drops, chlorophyll breaks down before the other pigments do.
How many membranes surround chloroplasts?
2
name of sac-like structures in chloroplast membranes
thylakoids
group of thylakoids is known as…
granum (pl. grana)
name of area outside thylakoids in the chloroplast
stroma
How does chlorophyll absorb the energy from light?
by transferring it to its own electrons
used to transfer high-energy electrons to other molecules
electron carriers
_____ + _______ + _______ –> NADPH
NAPD+
high-energy electrons
hydrogen ion
what is NADPH?
an electron carrier
are water and carbon dioxide low or high energy?
low
light-dependent reaction happens in…
thylakoid membranes
main thing light-dependent reaction does
It uses the energy from sunlight to add a phosphate to ADP, making it ATP
the light-dependent reaction also takes low-energy electrons and makes them high-energy electrons. Then it is transferred to _______, which gets converted into ________.
NADP+
NADPH
What happens to the water after the light-dependent reaction? Why?
The water becomes oxygen and is released into the atmosphere. This is because electrons have been taken away from it.
products of light-dependent reaction
O₂, ATP, NADPH
NADPH and ATP are used in the Calvin Cycle to make ____ from ________
sugars
carbon dioxide
