Photosynthesis Pmt

Question 1

Where light dependent and light independent stages occur

Answer 1

Light dependent: thylakoid
Light independent: stroma

Question 2

Give 3 example of mineral taken up from the soil and state the molecules produced when each combines with the product of the light independent stage. (3)

Answer 2

. Synthesis of phospholipids with a phosphate
. Synthesis of a chlorophyll with magnesium
. Synthesis of amino acid using a nitrogen source

Question 3

Explain how carbon dioxide is used in the production of glyercate 3 phosphate (2mark)

Answer 3

.RuBP and carbon dioxide linked together
. RuBP carboxylase
. Unstable 6 c substance splits into 2 3c

Question 4

Describe how glyercate-3-phosphate is converted to triose phosphate (3)

Answer 4

. Glyercate 3 phosphate is reduced
. Using reduced NADP
. ATP is also required to supply energy from light dependent reactions

Question 5

State why only some of the triose phosphate produced by the Calvin cycle can be used to produce hexose phosphate (1)

Answer 5

. Some triose phosphate needed to regenerate/make more RuBP

Question 6

Suggest how many times Calvin cycle must occur to produce one molecule of glucose (1)

Answer 6

6 times

Question 7

State precisely where chlorophyll a is found

Answer 7

In a photosytem and in the thylakoid membrane

Question 8

Explain result in range of 500 and 600nm range

Answer 8

Green light is reflected by pigments

Question 9

Explain an advantage of plants having f more than one pigment in their leaves (2)

Answer 9

. Light can be absorbed over more wavelength
. More light absorbed means more products from the light dependent stage
. Greater rate of photosynthesis

Question 10

Use ur knowledge of photosynthesis to explain the role of these pigments in the production of ATP(3)

Answer 10

. Light absorbed by pigments in photosytems
. Excited electrons to higher energy level
. Electron emitted from reaction centre/ chlorophyll a
. Used to power proton pump / generate EC gradient

Question 12

What is the function of chlorophyll a (1)

Answer 12

Absorbs light energy

Question 13

Why do all leaves have a green colour (1)

Answer 13

All wavelength expect green are absorbed

Question 14

What 2 process increases carbon dioxide level (2)

Answer 14

. Respiration
. Combustion