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biology > photosynthesis > Flashcards

photosynthesis Flashcards

1
Q

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

A

pass to electron carriers
returns to chlorophyll

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2
Q

name another molecule which can provide electrons during photosynthesis

A

water

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3
Q

identify a source of water for photosynthesis in the plant

A

soil

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4
Q

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

A

increased photosynthesis

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5
Q

write a balance chemical equation to summarise photosynthesis

A

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

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6
Q

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

A

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

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7
Q

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

A

it does not require light

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8
Q

explain why the dark stage is an anabolic process

A

it prods a large molecule from smaller molecules

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9
Q

name a suitable photosynthesis organism you used for this investigation

A

elodea

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10
Q

why was elodea suitable for this investigation

A

aquatic plant

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11
Q

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

A

dont effect the rate of photosynthesis

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12
Q

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

A

water bath

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13
Q

explain how you measure the rate of photosynthesis

A

counted the number of O2 bubbles in 1 minute intervals

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14
Q

in which cell organelle does photosynthesis occur

A

chloroplast

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15
Q

name the pigment essential for photosynthesis

A

chlorophyll

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16
Q

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

A

more light

17
Q

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

A

photolysis

18
Q

what is produced as a by product of the splitting water

A

oxygen

19
Q

describe how NADPH is produced

A

hydrogen ions join NADP- to form NADPH

20
Q

name stage 2

A

dark stage

21
Q

what is the role of ATP in stage 2 of photosynthesis

A

to transfer energy

22
Q

what does ATP stand for

A

adenosine triphosphate

23
Q

what is the end product of stage 2

A

glucose

24
Q

what is the function of chlorphyll in plants

A

to absorb light/energy

25
Q

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

A

absorb more energy

26
Q

outline the events of the dark stage of phtotsynthesisi

A

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

27
Q

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

A

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

28
Q

describe one way to increase plant production in a greenhouse

A

use a range of colours of light

29
Q

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

A

autotrophic

30
Q

what is the role of stomata in photosynthesis

A

gas exchange

31
Q

what particles are realised from chlorphyll during the light stage

A

electrons

32
Q

give an account of the events of pathway 2

A

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

33
Q

name two products of he light stage

A

ATP
NADPH

34
Q

outline the events of the light independent stage

A

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

35
Q

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

A

energy is available from immediate use

36
Q

name the nitrogenous base and the sugar present in ATP

A

nitrogenous gas - adenine
sugar present in ATP - ribose

37
Q

give two ways by which photosynthesis could be accelerated in horticulture

A

increase CO2
increase temperature

38
Q

is the dark stage anabolic or catabolic, explain

A

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

biology (35 decks)

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