photosynthesis

Question 1

the function of chlorophyll is to absorb sunlight energy and transfer this energy to election which then leave chlorophylll, from your knowledge of photosynthesis, give two possible fates of these electrons

Answer 1

pass to electron carriers
returns to chlorophyll

Question 2

name another molecule which can provide electrons during photosynthesis

Answer 2

water

Question 3

identify a source of water for photosynthesis in the plant

Answer 3

soil

Question 4

suggest one reason why horticulturists might use carbon dioxide enrichment in a greenhouse

Answer 4

increased photosynthesis

Question 5

write a balance chemical equation to summarise photosynthesis

Answer 5

6CO2 + 6H20 ->light/chlorophyll
C6H12O6+6O2

Question 6

describe in detail the main events of each pathway in the light stage

Answer 6

electron passes along an electron transport chain energy released in the form of ATP
pathway 1-electron retinas to chlorphyll
pathway 2-electron does not return to chlorphyll

Question 7

explain why the seconds stage of photosynthesis is called the dark stage

Answer 7

it does not require light

Question 8

explain why the dark stage is an anabolic process

Answer 8

it prods a large molecule from smaller molecules

Question 9

name a suitable photosynthesis organism you used for this investigation

Answer 9

elodea

Question 10

why was elodea suitable for this investigation

Answer 10

aquatic plant

Question 11

why was it important to keep other facts, such as temperature, constant during the investigation

Answer 11

dont effect the rate of photosynthesis

Question 12

how did you keep the temperature of the organism constant for the activity

Answer 12

water bath

Question 13

explain how you measure the rate of photosynthesis

Answer 13

counted the number of O2 bubbles in 1 minute intervals

Question 14

in which cell organelle does photosynthesis occur

Answer 14

chloroplast

Question 15

name the pigment essential for photosynthesis

Answer 15

chlorophyll

Question 16

describe one way in which horticulturists can increase plant yield in greenhouses

Answer 16

more light

Question 17

water is split during stage 1 using the energy in light, what is the name given to this process

Answer 17

photolysis

Question 18

what is produced as a by product of the splitting water

Answer 18

oxygen

Question 19

describe how NADPH is produced

Answer 19

hydrogen ions join NADP- to form NADPH

Question 20

name stage 2

Answer 20

dark stage

Question 21

what is the role of ATP in stage 2 of photosynthesis

Answer 21

to transfer energy

Question 22

what does ATP stand for

Answer 22

adenosine triphosphate

Question 23

what is the end product of stage 2

Answer 23

glucose

Question 24

what is the function of chlorphyll in plants

Answer 24

to absorb light/energy

Question 25

suggest why it is an advantage that chlorophyll contains a number of chemical rather than just one

Answer 25

absorb more energy

Question 26

outline the events of the dark stage of phtotsynthesisi

Answer 26

energy from ATP NADPH release electron NADPH release protons CO2 combines with electron and protons form glucose

Question 27

explain how the dark stage is necessary for the continuation of the light stage

Answer 27

ADP+P and NADP+ return to the light stage to be used again

Question 28

describe one way to increase plant production in a greenhouse

Answer 28

use a range of colours of light

Question 29

name the type of nutrition exhibited by organisms that carry out photosynthesis

Answer 29

autotrophic

Question 30

what is the role of stomata in photosynthesis

Answer 30

gas exchange

Question 31

what particles are realised from chlorphyll during the light stage

Answer 31

electrons

Question 32

give an account of the events of pathway 2

Answer 32

two energised electrons leave the electron acceptor these join to NADP+ to form NADPH water is split by photolysis into hydrogen ions - these join NADP- to form NADPH oxygen - release into the atmosphere energised electrons - returns to chlorophyll

Question 33

name two products of he light stage

Answer 33

ATP NADPH

Question 34

outline the events of the light independent stage

Answer 34

ATP supplies energy NADPH provides electrons and H ions CO2 supplies carbon to make glucose

Question 35

suggest an advantage to the cell of using ATP as ana energy source, instead of breaking dow a sugar molecule every time energy is needed

Answer 35

energy is available from immediate use

Question 36

name the nitrogenous base and the sugar present in ATP

Answer 36

nitrogenous gas - adenine sugar present in ATP - ribose

Question 37

give two ways by which photosynthesis could be accelerated in horticulture

Answer 37

increase CO2 increase temperature

Question 38

is the dark stage anabolic or catabolic, explain

Answer 38

anabolic - smalle molecules(CO2 and H20) form larger molecules(glucose)