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

Question 21

Photosynthesis Requirements:

Answer 21

sunlight, chloroplasts, wavelengths

Question 22

study of photosynthesis:

Answer 22

test for starch, sunlight, chlorophyll, CO2, O2

Question 23

continuously recycles the energy carriers to maintain the continuous production of glucose.

Answer 23

Calvin Cycle

Question 24

particularly effective in driving photosynthesis, as they are strongly absorbed by chlorophyll.

Answer 24

red light

Question 25

they are absorbed by chlorophyll and contribute to the overall energy production.

Answer 25

blue light

Question 26

are less effectively absorbed by chlorophyll

Answer 26

green light

Question 27

Factors Affecting Photosynthesis

Answer 27

light intensity, temperature, water availability, CO2 concentration

Question 28

plants sample used for light requirement and light intensity

Answer 28

mayana, hydrilla sprig

Question 29

What will happen to the color of a leaf placed under sunlight compared to a leaf placed in the dark when tested with iodine solution, and what does this indicate about photosynthesis?

Answer 29

When exposed to sunlight, the leaf undergoes photosynthesis, using light energy to produce glucose. This glucose is then stored as starch in the leaf. The iodine reacts with the starch, producing the bluish-black color

Question 30

as light intensity increases, what happens to the rate of photosynthesis?

Answer 30

also increases

Question 31

What is the order of bubble formation under different light wavelengths in the Hydrilla experiment

Answer 31

red > blue > white > yellow > green

Question 32

What chemical indicator is used in the experiment to test for carbon dioxide?

Answer 32

phenol red

Question 33

What color does phenol red turn in an acidic solution

Answer 33

yellow

Question 34

What happens to the color of the solution in test tube awith hydrilla fter 2-3 hours in bright light?

Answer 34

pale orange to red, indicating photosynthesis reduced the acidity.