Photosynthesis quiz

Question 1

Photosynthesis equation

Answer 1

6CO2 + 6H20 + light —> C6H12012 + 602

Question 2

autotrophs

Answer 2

an organism that makes its OWN food

Question 3

heterotrophs

Answer 3

consumers- must eat organic material

Question 4

what organelle does photosynthesis occur in?

Answer 4

chloroplasts

Question 5

what part of the plant is the major site for photosynth?

Answer 5

leaves - they are greenest part of the plant meaning they contain the most chlorophyll which is in chloroplasts

Question 6

are chloroplasts double-membraned?

Answer 6

yes!

Question 7

thylakoids

Answer 7

discs that contain chlorophyll - are the site of light reactions-

Question 8

stack of thylakoids…

Answer 8

grana/granum

Question 9

stroma

Answer 9

liquid inside a chloroplast - site of calvin cycle

Question 10

names of 2nd part of photosynthesis

Answer 10

calvin cycle, dark reactions, light-independent reactions

Question 11

chlorophyll

Answer 11

green pigment in thylakoids that captures light

Question 12

palisade mesophyll

Answer 12

UPPER part of a leaf; majority of photosynth. happens here

Question 13

stomata

Answer 13

opening in leaf that allows CO2 in and O2 out (also water)

Question 14

when does a stomata close?

Answer 14

in high temperatures to avoid losing water

Question 15

what parts of the photosynthesis equation are in dark reactions?

Answer 15

6CO2 in —> G3P —> C6H12O6 (glucose)

Question 16

what parts of the photosynth. equation are apart of the light reactions?

Answer 16

6H20 —> in and 6O2 out

Question 17

Can humans see absorbed light?

Answer 17

No- we can only see reflected light

Question 18

how many types of chloroplast pigments are there?

Answer 18

4

Question 19

chlorophyll a

Answer 19

bright green - absorbs blue and red light and participates DIRECTLY in photosynth.

Question 20

chlorophyll b

Answer 20

dark green - absorbs blue and orange light and increases the range of light that can be absorbed

Question 21

carotenoids

Answer 21

yellow/orange - absorbs blue-green light and dissipates excess light to protect chlorophyll a

Question 22

anthocyanin

Answer 22

red, pink, blue, purple- absorbs blue-green light, absorbs light, and attracts pollinators

Question 23

photon

Answer 23

fixed quantity of light energy that excites electrons in light reactions

Question 23

photosystems

Answer 23

cluster of pigment molecules that attract photons

Question 24

what color do leaves absorb the most?

Answer 24

red and blue

Question 25

light reactions

Answer 25

absorbs solar energy to be converted to ATP and NADPH and O2 as a byproduct

Question 26

light reaction step 1

Answer 26

protons hit chlorophyll in PS2 --> excite electrons

Question 27

light reactions- what happens after electrons are excited?

Answer 27

electrons travel down electron transport chain

Question 28

light reactions - PS2 function

Answer 28

PS2 splits water to replace electrons (H+ and oxygen)

Question 29

light reactions - as the electrons move down ETC, what is their energy being used for?

Answer 29

electron's energy is used to pump H+ to thylakoid space

Question 30

light reactions- what direction do H+ ions go?

Answer 30

H+ move to stroma (high to low) via ATP synthase

Question 31

light reactions- how is ATP produced?

Answer 31

ATP synth. rotates with H+ ions and produces ATP

Question 32

light reactions- what does PS1 do?

Answer 32

PS1 excites electrons and makes NADPH

Question 33

light reactions- what is the energy in the excited electrons used for after PS1?

Answer 33

electrons used to reduce NADP+ to NADPH (an electron carrier)

Question 34

Calvin cycle- Carbon Fixation

Answer 34

RuBis Co (an enzyme) attaches the 5-carbon molecule RUBP to a one-carbon molecule CO2 ---> forms 2 molecules of 3-phosphoglycerate

Question 35

Calvin cycle - reduction

Answer 35

each 3-phosphoglycerate is reduced to form G3P (uses energy from ATP and electrons from NADPH)

Question 36

Phase 3 - regeneration

Answer 36

one molecule of G3P will leave to form sugars and the rest will be recycled to form RUBP

Question 37

photosystem 2

Answer 37

water-splitting

Question 38

photosystem 1

Answer 38

NADPH producing