Module 7: Photosynthesis

Question 1

is a vital process that sustains life on earth

Answer 1

photosynthesis

Question 2

specialized organelles where photosynthesis occurs

Answer 2

chloroplasts

Question 3

pigment that absortbs light energy

Answer 3

chlorophyll

Question 4

is the first stage, light energy is captured and used to split water molecules, releasing energy and generating ATP and NADPH

Answer 4

light-dependent reactions

Question 5

light dependent reaction products:

Answer 5

ATP and NADPH

Question 6

second stage that utilizes the ATP and NADPH to convert CO2 into glucose

Answer 6

light-independent reations/calvin cycle

Question 7

here photosynthesis rate is limited as there is insufficient light energy

Answer 7

low light intensity

Question 8

rate of photosynthesis increases proportionaly to the amount of light available

Answer 8

moderate light intensity

Question 9

photosynthesis reaches a plateau, as the system becomes saturated and cannot process more light

Answer 9

high light intensity

Question 10

light intensity - photosynthesis rate

Answer 10

low - low
moderate - high
high - plateau

Question 11

wavelengths primarily absorbed by chlorophyll and light reflected

Answer 11

absorbs red and blue, reflects green

Question 12

chlorophyll and absorption of light energy:

Answer 12

1. light absorption, exciting electrons
2. excited electrons move through an electron transport chain, releasing energy to form ATP
3. NADPH formation

Question 13

molecule that carries reducing power for the calvin cycle

Answer 13

NADPH

Question 14

is incorporated into organic molecules during the calvin cycle, using energy from ATP and NADPH

Answer 14

carbon dioxide

Question 15

calvin cycle’s product

Answer 15

glucose

Question 16

CO2 cycle in photosynthesis:

Answer 16

1. Co2 is incorporated into a five-carbon sugar, RuBP
2. ATP and NATP provide energy to drive the reactions and reduce CO2 to sugars
3. cycle regerates RuBP, some CO2 are incorporated into glucose

Question 17

practical implications of photosynthesis:

Answer 17

food production, biofuel, carbon sequestration (remove co2 in atmosphere)

Question 18

raw materials for photosynthesis

Answer 18

light, a green pigment, water,
and carbon dioxide

Question 19

photosynthesis chemical reaction:

Answer 19

6CO2 + 12H2O ➞ C6H12O6 + 6H2O + 6O2 ↑

Question 20

the rate of photosynthesis as affected by some factors

Answer 20

light intensity, light wavelengths, carbon dioxide