Photosynthesis

Question 1

Photoautotrophs

Answer 1

use light energy to synthesize organic compounds.

Question 2

photosunthesis is a series of what kind or reactions?

Answer 2

redox (gaining energy as it moves forward, endergonic because it requires light energy

Question 3

what is the flui called within the chloroplasts?

Answer 3

stroma

Question 4

what are the pores of the chloroplasts called?

Answer 4

stomata

Question 5

what is grana?

Answer 5

stacks of thylakoids

Question 6

how does CO2 and O2 enter and exit the chloroplast?

Answer 6

via the stomata

Question 7

how does water get into the chloroplast?

Answer 7

viens called xylem

Question 8

what drives photosynthetic reations?

Answer 8

light absorption in the chloroplasts

Question 9

where does the oxygen gas within photosynthesis come from?

Answer 9

the splitting of 2 water molecules

Question 10

where does the light reation take place?

Answer 10

in the thylakoid membrane

Question 11

where does sugar get produced in photosynthesis?

Answer 11

the dark reaction

Question 12

what are the 3 pigments within the chloroplast and what are their functions?

Answer 12

chlorophyll a: absorb light energy (blue green light)
chlorophyll b: an accessory pigment (olivia green light)
carotenoids: group of accessory pigments (yellow/orange)

Question 13

what is the least effective light colour?

Answer 13

green because it is reflected so it cannot perform work.

Question 14

why might a substance show fluorensent light?

Answer 14

fluoresent light is an example of an electron absorbing a photon and reaching an excited state but not utilizing this energy and allowing it to be released as light.

Question 15

is an electron in an excited state stable?

Answer 15

no

Question 16

what are the 2 photosystems and which functions first?

Answer 16

photosystem 2 called p680 functions first followed by photosystem 1 called p700

Question 17

after being excited what is the order the electron is passed through the ETC between complex 2 and complex 1?

Answer 17

plastiquinone, cytochrome complex, plastocyanin

Question 18

After p700* is formed how do the electrons get passed to NADP+?

Answer 18

through ferrodoxin and NADP+ reductionase

Question 19

what photosystem does cyclic electron flow use?

Answer 19

photosystem 1 (electron is excitedto p700* but goes backwards through ferrodoxin back to the cytochrome complex, plastocyanin to p700)

Question 20

what do light reations produce that is used at a reactant in dark reactions?

Answer 20

NADPH and ATP

Question 21

what is photorespiration?

Answer 21

when temperatures are very high stomata will close resulting in a low intake of CO2 meaning less photosynthetic yield

Question 22

what are the two cells in a C4 plant?

Answer 22

bundle sheath cell (around the veins of the leaf) and a mesophyll cell (between the bundle sheath cell and the leaf surface)

Question 23

which cell within the C4 plant does not allow oxygen to enter?

Answer 23

bundle sheath cell (where the calvin cycle takes place)

Question 24

what is a CAM plants strategy?

Answer 24

stomata are closed during the day but open at night to help conserve water, CO2 is taken in at night and converted to organic acids to be used during the day

Question 25

what percentage of photosynthetic products is used as fuel for cellular respiration?

Answer 25

50%