Photosynthesis

Question 1

Function of Chlorophyll

Answer 1

To absorb light

Question 2

Why chlorophyll contains a number of chemicals

Answer 2

To absorb a greater range of wavelengths of light

Question 3

The Dark stage

Answer 3

Energy form ATP
NADPH releases electrons
NADPH releases H+ ions
Co2 combines with electrons and H+ ions to form glucose

Question 4

How dark stage is necessary for the continuation of light stage

Answer 4

Glucose is used in light stage

Question 5

One way to increase plant production in greenhouse

Question 6

Particles released from chlorophyll during light stage

Answer 6

Electrons

Question 7

Account of pathway 2

Answer 7

Electrons trapped by NADP
H+ trapped  by NADP to form NADPH
Water splits(Photolysis)
into H+ and electrons
O2 is formed
electrons pass to chlorophyll
ATP is formed

Question 8

Light stage major events

Answer 8

light is absorbed
water is split(photolysis)
ATP is formed(photophosphorylation)
NADPH2 is formed

Question 9

Cyclic photophosphorylation(Pathway 1)

Answer 9

Light absorbed. High energy electron released from chlororphylll molecule

electron picked up by electron acceptor ferrodoxin

electron passed to many electron carriers losing energy

This release energy used to convert ADP to ATP

low energy electrons passed back to chlorophyll molecule to be re - energised

Question 10

Non-Cyclic photophosphorylation(Pathway 2)

Answer 10

Chlorophyll 1 and 11 absorb light releasing high energy electrons

picked up by electron acceptors

electrons form chlorophyll 1 passed NADP and combine with hydrogen ions to form NADPH 2

Electrons from chlorophyll 2 passed to 1 to form ATP