Week 8/9 (Photosynthesis)

Question 1

what is photosynthesis?

Answer 1

coverts light energy into chemical energy ( food )

Question 2

where is the site of photosynthesis?

Answer 2

chloroplasts

Question 3

where are chloroplasts found and what’s unique about them

Answer 3

-mainly in mesophyll cells
-they have a double membrane

Question 4

stomata

Answer 4

-microscopic pores
-how O2 exits and CO2 enters the leaf

Question 5

photosynthesis reaction

Answer 5

6CO2 + 12H20 + light + pigments -> C6H12O6 + 6O2 +6H2O

Question 6

what do chloroplasts do ?

Answer 6

split water molecules

Question 7

what type of reaction is photosynthesis?

Answer 7

redox reaction
polar to nonpolar covalent bonds

Question 8

the light reactions are in where and what do they do

Answer 8

-in thylakoids
-convert solar energy to chemical energy

Question 9

light independent reaction what is and where

Answer 9

calvin cycle in stroma

Question 10

role of pigments

Answer 10

absorb photons in the thylakoid membrane

Question 11

what colors do plants absorb vs what is transmitted?

Answer 11

absorb red,blue,indigo and transmit green

Question 12

carotenoids

Answer 12

yellow/orange/ red accessory pigments which gives color to plants ex ripe tomatoes or autumn leaves

Question 13

photophosphorylation

Answer 13

conversion of ADP to ATP using the energy of sunlight by activation of PSII

Question 14

photolysis

Answer 14

splitting of water molecule into H protons and O in PSII

Question 15

antenna complex in photosystems

Answer 15

hands energy from photon of light down to reaction center

Question 16

Photosystem 1

Answer 16

actually comes second in line
-P700
-reaction center (chlorophyll a)
-generates NADPH

Question 17

Photosystem II

Answer 17

-occurs first
-P680
-reaction centre (chlorophyll a)
-generates ATP

Question 18

what do the photosystems do

Answer 18

use light energy to generate ATP and NADPH

Question 19

linear electron flow

Answer 19

involves PS1 and PSII
produces ATP and NADPH

Question 20

cyclic electron flow

Answer 20

involves PS1 and only produces ATP

Question 21

ATP molecules are generated by what

Answer 21

-chemiosmosis
H+ moves from thylakoid lumen to stroma

Question 22

inputs and outputs of light reactions

Answer 22

inputs:
light (sun)
water
NADP+
ADP and Pi

outputs:
ATP
NADPH
O2

Question 23

purpose of calvin cycle ?

Answer 23

to produce 1G3P

3x turns for 1 G3P
6x turns for one glucose

Question 24

what is needed for one CO2 molecule

Answer 24

3ATP and 2NADPH

Question 25

what is needed to make 1G3P

Answer 25

3CO2
9ATP
6NADPH

Question 26

on hot dry days what do plants do?

Answer 26

close their stomata to conserve water

Question 27

photorespiration

Answer 27

-metabolizes a wasteful by product of photosynthesis
-no ATP is produced
-photorespiration decreases photosynthesis output

Question 28

C4 plants

Answer 28

light reactions occurs in mesophyll cells and calvin cycle in bundle sheath cells to find a way around photorespiration

Question 29

CAM plants

Answer 29

succulents
-open stomata during the night and close it during the day
-less risk of dehydration
-make oxygen at night