photosynthesis

Question 1

what does photosynthesis do?

Answer 1

transforms solar energy into the chemical energy of carbohydrates

Question 2

equation for photosynthesis

Answer 2

6CO2+6H2O –> C6H12O6+6O2

Question 3

where does carbon dioxide enter the leaves through

Answer 3

stomata

Question 4

where does carbon dioxide and water diffuse to?

Answer 4

chloroplast, the site of photosynthesis

Question 5

what does the stroma contain

Answer 5

numerous flat thylakoid disk arranged in stacks called grana

Question 6

2 reactions involved in photosynthesis are…?

Answer 6

-light reactions
-calvin cycle

Question 7

what are the 3 events involved in the light reaction?

Answer 7

chlorophyll-absorbs solar energy, which energized electrons and splits H20
ATP- produced using an electron transport chain
NADP+ -a coenzyme, accepts electrons to become NADPH

Question 8

what are the events involved in the Calvin Cycle?

Answer 8

CO2- taken up by one of the substrates in the cycle
ATP and NADPH-from the light reactions change CO2 to a carbohydrate

Question 9

solar energy can be described in terms of its…?

Answer 9

wavelength and energy content

Question 10

two primary pigments used during photosynthesis are…?

Answer 10

chlorophylls and carotenoids

Question 11

what colors do chlorophylls absorb and reflect

Answer 11

absorb- violet, red, and blue wavelengths
reflect- green light

Question 12

what do carotenoids absorb and reflect?

Answer 12

absorb- violet, blue, and green
reflect- yellow and orange wavelengths

Question 13

what color are Xanthophylls?

Answer 13

yellow

Question 14

what do the electron pathways in the light reactions produce?

Answer 14

ATP and NADPH

Question 15

Parts to a photosystem

Answer 15

-pigment complex, or light antenna
-special chlorophyll pigment, the reaction center
-electron acceptor molecules

Question 16

how do electrons gain energy in photosynthesis?

Answer 16

by being boosted up an energy hill

Question 17

what is light energy converted into after providing a boost for electrons?

Answer 17

chemical energy, which is stored in the chemical bonds of sugar molecules

Question 18

what happens to photosystem II (PS II)absorbs solar energy?

Answer 18

energized electrons get passed to electron acceptors

Question 19

what does PSII do?

Answer 19

splits water molecules to recover the electrons passed to the electron acceptors

Question 20

as electrons are passed down an electron transport chain, energy is release and stored in the form of a …?

Answer 20

Hydrogen ion (H+) gradient

Question 21

what happens when photosystem I (PSI) absorbs solar energy?

Answer 21

energized electrons are passed to different electron acceptors

Question 22

the electron acceptors in PSI pass the electrons to..?

Answer 22

NADP+ to form NADPH

Question 23

what does the thylakoid space or lumen become during photosynthesis?

Answer 23

an H+ reservoir

Question 24

what is NADP+

Answer 24

a coenzyme that accepts H+ from a substrate

Question 25

How and when is NADPH formed

Answer 25

it is formed during the light reactions by accepting electrons from the electron transport pathway and then picks up H+

Question 26

the 3 steps of the calvin cycle

Answer 26

-carbon dioxide fixation
-carbon dioxide reduction
-regeneration of RuBP

Question 27

what happens during the first step of the calvin cycle

Answer 27

CO2 from the air is attached to RuBP
-the enzyme for this reaction is carboxylase oxygenase (rubisco)

Question 28

what does Rubisco do?

Answer 28

splits the resulting 6-carbon molecule to form two 3-carbon molecules

Question 29

during reduction of carbon dioxide, what do NADPH and ATP provide?

Answer 29

NADPH-provides electrons for the reduction
ATP- provides the energy

Question 30

what is the product of the calvin cycle

Answer 30

gylceraldehyde-3-phosphate (G3P)

Question 31

what is the primary advantage of CAM photosynthesis?

Answer 31

conservation of water