Photosynthesis

Question 1

Describe how the membranes inside the chloroplast are used in photosynthesis 3

Answer 1

-ATP synthase in thylakoid membranes
-thylakoid membranes provide space for accumulation of H+
-compartmentalisation from stroma
(photosynthetic pigments located on membrane)

Question 2

Describe how oxygen is produced in light dependent reactions? 4

Answer 2

-made from photolysis,
-breakdown of water
-forming Oxygen atom, electrons and H+ ions
-in chloroplast
(2 water molecules are needed to produce O2)

Question 3

Describe the structure of chloroplasts in relation to their roles in photosynthesis 3

Answer 3

-thylakoid membranes are sight of light dependent reactions
-photosystems on thylakoid membranes
-stroma is sight of light independent reaction
(compartmentalisation from chloroplast and thylakoid membrane provides space for accumulation of H+)

Question 4

How could plants be grown in photosynthesis practical to ensure valid study 2

Answer 4

standardised water and soil type

Question 5

how could a study on effect of day length on flowering between 6,12,18,24 hrs be more accurate?

Answer 5

use shorter time intervals

Question 6

whats 1 environmental cue that could stimulate more flowering?

Answer 6

intensity of light

Question 7

Why would the lamina (thin area containing photosynthetic cells) be important for carb production? 2

Answer 7

-fast uptake of co2
-co2 used in calvin cycle

Question 8

Why would vessels in the midrib with photosynthetic cells be important for carb production? 2

Answer 8

-transport in xylem of water to leaves
-water needed for photolysis in light dependent reaction

Question 9

Suggest how GALP can be used to synthesise the
cellulose in plant cell walls. 4

Answer 9

-conversion of galp to b glucose
-so formation of glycosidic bonds
-these bonds are 1-4
-by condensation reactions

Question 10

Suggest how GP can be used to synthesise starch? 4

Answer 10

-conversion of GP to GALP
-using ATP and reduced NADP
-conversion of GALP to alpha glucose
-by 1,4 and 1,6 glycosidic bonds

Question 11

Explain why this increase in carbon dioxide concentration affects the growth of plants in glasshouses. 3

Answer 11

CO2 is fixed to produce GP
So more co2 results in more glucose production
which would lead to greater growth

Question 12

GPP

Answer 12

The rate at which energy is incorporated into organic molecules by an ecosystem

Question 13

NPP

Answer 13

The rate at which energy is transferred into the organic molecules that make up new plant biomass

Question 14

NPP equation

Answer 14

GPP-R

Question 15

efficiency of photosynthesis equation

Answer 15

GPP/energy received by light for plants x 100