Photosynthesis

Question 1

Main site of photosynthesis

Answer 1

Chloroplasts locating in the palisade mesophyll

Question 2

What is the Absorption Spectrum

Answer 2

The quantity of light absorbed at each wavelength

Question 3

What is the Action Spectrum

Answer 3

The rate of photosynthesis at each wavelength

Question 4

Where does the light dependent stage of photosynthesis take place?

Answer 4

Thylakoids membrane

Question 5

Where does the light independent stage of photosynthesis take place?

Answer 5

Storma of chloroplast

Question 6

4 stages of the Calvin cycle ( light independent stage)

Answer 6

CO2 fixation
Reduction of G3P to form TP
Regeneration of some TP
Conversion of some TP into other organic compounds

Question 7

Describe the process of Carbon fixation

Answer 7

CO2 combines with RuBp to form 2x G3P

This is carboxylation catalysed by the enzyme Rubisco

Question 8

What enzyme catalyses the carboxylation of RuBp in the Calvin cycle

Answer 8

Rubisco

Question 9

Describe the process of the reduction of G3P in the Calvin cycle

Answer 9

NADPH2 is used to reduce G3P to TP
NADPH2 -> NADP
The energy used for this reaction is provided by the hydrolysis of ATP
ATP -> APD + Pi

Question 10

What’s the difference in pH in the thylakoid space compared to the stroma

Answer 10

Lower pH / more acidic in thylakoid space due to high concentration of H+ molecules from the photolysis of water

Question 11

Main photosynthetic pigments found in plants

Answer 11

Chlorophyll a
Chlorophyll b
Carotene
Xanthophyll

Question 12

Function of photosynthetic pigments

Answer 12

Absorb light energy/ photons

Converting it to chemical energy

Question 13

What pigment is found in the reaction centre of an antenna complex

Answer 13

Chlorophyll a