photosynthesis

Question 1

what does sunlight do in photosynthesis?

Answer 1

gives the plant energy

Question 2

what does water do in photosynthesis?

Answer 2

travels through the xylem

Question 3

what does carbon dioxide do in photosynthesis?

Answer 3

enters through stomata on the underside of leaf

Question 4

what is chlorophyll?

Answer 4

green pigment in the chloroplast where the chemical reaction happens

Question 5

what does glucose do in photosynthesis?

Answer 5

used by the leaf as a food source

Question 6

what does oxygen do in photosynthesis?

Answer 6

diffuses from cell/released from leaf

Question 7

what is the word equation for photosynthesis?

Answer 7

light energy
carbon dioxide + water —-> glucose + oxygen
chlorophyll

Question 8

what is the first stage of photosynthesis called?

Answer 8

light reaction

Question 9

what happens during light reaction?

Answer 9

light energy from the sun is trapped by chlorophyll in the chloroplasts of green plants
light energy is then converted into chemical energy to generate ATP
water is split to produce hydrogen and oxygen (photolysis)
oxygen is a by-product which diffuses from the cell

Question 10

what is light energy converted into?

Answer 10

chemical energy

Question 11

what is the equation for the production of ATP?

Answer 11

ADP + Pi –> ATP

Question 12

what is the second stage of photosynthesis called?

Answer 12

carbon fixation

Question 13

what is carbon fixation?

Answer 13

a series of enzyme controlled reactions, which uses hydrogen and ATP (produced during stage one) with carbon dioxide to produce sugar (glucose)

Question 14

what is produced during stage one of photosynthesis?

Answer 14

• ATP
• hydrogen
• oxygen (byproduct)

Question 15

glucose

Answer 15

• used for respiration
• produces ATP for cellular activites

Question 16

starch

Answer 16

• storage carbohydrate
• used as an enzyme store

Question 17

cellulose

Answer 17

• structural carbohydrate
• component of plant cell wall

Question 18

what is a limiting factor?

Answer 18

a factor which if increased can increase the rate of photosynthesis

Question 19

what are the three limiting factors?

Answer 19

• temperature
• light intensity
• carbon dioxide concentration

Question 20

any point on the slope equals…

Answer 20

the x axis

Question 21

any point on the constant of the graph…

Answer 21

any other factor

Question 22

outline the energy transfer that takes place in photosynthesis

Answer 22

• light energy is absorbed by chlorophyll
• this is converted into chemical energy in the form of ATP
• this is used to make chemical energy called glucose

Question 23

how can the rate of photosynthesis be measured?

Answer 23

• number of oxygen bubbles produced per minute
• volume of carbon dioxide taken in by the plant
• measuring the increase in dry mass of the plant (measures the mass of starch produced)

Question 24

black paper will…

Answer 24

remove light

Question 25

plastic bag with chemical will…

Answer 25

remove carbon dioxide