2.9 photosynthesis

Question 1

photosynthesis

Answer 1

the production of carbon compounds in cells using light energy

Question 2

write the photosynthesis equation

Answer 2

see ipad

Question 3

what can the carbon compounds made from photosynthesis be used for?

Answer 3

for cellular respiration to produce ATP

Question 4

what colors does chlorophyll absorb best?

Answer 4

red and blue light

Question 5

what color does chlorophyll reflect best?

Answer 5

green light

Question 6

chlorophyll

Answer 6

a green pigment embedded in the thylakoid membrane that is responsible for light absorption

Question 7

types of chlorophyll

Answer 7

a and b

Question 8

what happens when a chlorophyll molecule absorbs light?

Answer 8

it releases electrons which are used to produce ATP

Question 9

draw the absorption spectrum for chlorophyll a and b

Answer 9

see ipad

Question 10

draw the action spectrum for photosynthesis

Answer 10

see ipad

Question 11

Rբ equation

Answer 11

distance moved by pigment / distance moved by solvent

Question 12

2 steps of photosynthesis

Answer 12

1. light-dependent reaction
2. light-independent reaction

Question 13

2 steps of photosynthesis

Answer 13

1. light-dependent reaction
2. light-independent reaction

Question 14

light-dependent reaction

Answer 14

light energy (from the sun) is converted into chemical energy (ATP)

Question 15

light-independent reaction

Answer 15

chemical energy (ATP) is used to synthesize carbon compounds (carbohydrates)

Question 16

where does the light-dependent reaction occur?

Answer 16

in the thylakoids of the chloroplast (where chlorophyll is)

Question 17

describe the light-dependent process

Answer 17

1. Light is absorbed by chlorophyll, which results in the production of ATP (chemical energy)
2. Light is also absorbed by water, which is split (photolysis) to produce oxygen and hydrogen
3. The hydrogen and ATP are used in the light independent reactions, the oxygen is released from stomata as a waste product

Question 18

where does the light-independent reaction occur?

Answer 18

in the stroma

Question 19

describe the light-independent reaction

Answer 19

1. ATP and hydrogen (carried by NADPH) are transferred to the site of the light independent reactions
2. The hydrogen is combined with carbon dioxide to form complex organic compounds (e.g. carbohydrates, amino acids, etc.)
3. The ATP provides the required energy to power these anabolic reactions and fix the carbon molecules together

Question 20

draw a diagram of photosynthesis

Answer 20

see ipad

Question 21

draw a diagram of the relationship b/w photosynthesis and cell respiration

Answer 21

see ipad

Question 22

relationship b/w photosynthesis and cell respiration

Answer 22

• photosynthetic organisms use light energy from the sun to create energy (ATP)
• this energy is used to synthesize organic compounds
• animals consume these organic compounds and release the stored energy via cell respiration

Question 23

what does the absorption spectrum indicate?

Answer 23

the wavelengths of light absorbed by each pigment

Question 24

what does the action spectrum indicate?

Answer 24

the overall rate of photosynthesis at each wavelength of light

Question 25

fill in photosynthesis process diagram

Answer 25

see ipad

Question 26

what happens in photolysis

Answer 26

Water is split by light to make oxygen, H+ (protons) and electrons)

Question 27

What is the waste gas given off by photosynthesis?

Answer 27

oxygen

Question 28

what is carbon fixation

Answer 28

ATP and hydrogen are used as forms of chemical energy to convert carbon dioxide and water into useful organic molecules for plants (rubisco catalyzes this reaction)

Question 29

What atmospheric gas is essential for photosynthesis to occur?

Answer 29

carbon dioxide

Question 30

3 ways one could measure the rate of photosynthesis

Answer 30

O2 production CO2 intake Biomass accumulated (taking into account cell respiration)