photosynthesis

Question 1

what is the grana?

Answer 1

inner part of the chloroplasts, where light dependent stage takes place

Question 2

why is water important?

Answer 2

• source of protons that are used in photophosphorylation
• donates electrons to replace those lost when light strikes chlorophyll
• keeps plant cell turgid

Question 3

what are the two types of photophosphorylation?

Answer 3

• non cyclic –> involves both photosystems

- cyclic –> involves photosystem 1

Question 4

explain non cyclic phosphorylation.

Answer 4

see page 120 of A level OCR textbook

Question 5

which photosystem comes first?

Answer 5

photosystem 2

Question 6

draw the Calvin cycle.

Answer 6

see page 123 of A level OCR textbook

Question 7

what factors effect the rate of photosynthesis?

Answer 7

• light intensity
• co2 concentration
• temperature

Question 8

how does light intensity effect the rate of photosynthesis?

Answer 8

1. GP cannot be reduced to TP
2. TP levels fall and GP accumulates
3. if TP levels fall, RuBP cannot be regenerated

Question 9

how does co2 concentration effect rate of photosynthesis?

Answer 9

1. RuBP cannot accept it, it accumulates
2. GP cannot be made
3. therefore, TP cannot be made