Science 8 Flashcards
Which regions do chloropyll a and b abosrb light well in?
the blue-violet and red regions
Which regions does chlorophyll not absorb light very well in?
the green regions
Why do plants looks green?
leaves reflect green light
Why do leaves change color in autumn?
as temperatures drop later in the year, the chloropyll molecules break down before the carotene molecules, which absorb light in different places of the spectrum
What is the equation for photosynthesis in words?
carbon dioxide + water (light)—-> sugars and oxygen
What is the equation for photosynthesis in symbols?
6CO(2)+6H(2)O (light)—> C(6)H(12)O(6)+6O(2)
carbon dioxide + water (light)—-> sugars and oxygen
light-dependent reactions
set of reactions in photosynthesis that use energy from light to produce ATP and NADPH
light-independent reactions
set of reactions in photosynthesis that do not require light; energy from ATP and NADPH is used to build high-energy compounds such as sugar; also called the Calvin cycle
What are the three factors that affect the rate of photosynthesis?
temperature, light intensity, and the availability of water
At what temperatures do the functions of photosythesis work best?
0 degrees Celcius to 35 degrees Celcius
What does light intensity do to photosynthesis?
It increases the rate. Once there is a certain amount of light, however, the plant reaches its maximum rate of photosynthesis.
What can water loss do to a plant?
It can slow or even stop photosynthesis.
ATP
compound used by cells to store and release energy
sugar glucose
stores more than 90 times the energy required to add a phospate group to ADP to produce ATP
electron-transport chain
series of electron carrier proteins that shuttle high-energy electrons during ATP-generating reactions
