Photosynthesis
6.1What the syllabus asks of you
- Understand that photosynthesis is the process by which plants make carbohydrates from raw materials using energy from light
- State that chlorophyll is a green pigment that is found in chloroplasts
- State that chlorophyll transfers light energy into chemical energy for the formation of glucose and other carbohydrates
- Outline the subsequent use and storage of the carbohydrates made in photosynthesis, limited to: (a) starch as an energy store (b) cellulose to build cell walls (c) glucose used in respiration to provide energy (d) sucrose for transport through the plant
- State the word equation and balanced chemical equation for photosynthesis
- Investigate the need for chlorophyll, light and carbon dioxide for photosynthesis, using appropriate controls
- Describe and explain the effect of varying light intensity, carbon dioxide concentration and temperature on the rate of photosynthesis
- Investigate the effect of varying light intensity, carbon dioxide concentration and temperature on the rate of photosynthesis using submerged aquatic plants and hydrogencarbonate indicator solution
- Identify and explain the limiting factors of photosynthesis in different environmental conditions
Read the notes first
Chapter 6: Photosynthesis
Drill this topic
Every question on Photosynthesis, untimed, marked as you go.
Make a worksheet
Choose the years and how many questions, then print it with the answers on separate pages.
13 questions
1Oct / Nov 2020 · Paper 11 · Q5Show mark scheme →
ACO2 1, H2O 1; C6H12O6 1, O2 1
BCO2 1, H2O 6; C6H12O6 6, O2 1
CCO2 1, H2O 6; C6H12O6 6, O2 6
DCO2 6, H2O 6; C6H12O6 1, O2 6
Mark scheme
2Oct / Nov 2020 · Paper 11 · Q7Show mark scheme →
AP and R
BQ and S
CR and Q
DS and P
Mark scheme
3Oct / Nov 2020 · Paper 12 · Q7Show mark scheme →
AP and R
BQ and S
CR and Q
DS and P
Mark scheme
4May / June 2020 · Paper 12 · Q6Also set in May / June 2020 Paper 11Show mark scheme →
Ain light; airtight bung; glass jar; green plant; filter paper; sodium hydroxide solution to absorb carbon dioxide; water
Bin dark; airtight bung; glass jar; green plant; hydrogencarbonate indicator to detect carbon dioxide; water
Cin light; airtight bung; glass jar; green plant; hydrogencarbonate indicator to detect carbon dioxide; water
Din light; airtight bung; glass jar; green plant; oil layer; water
Mark scheme
5May / June 2020 · Paper 12 · Q7Also set in May / June 2020 Paper 11Show mark scheme →
Acarbon dioxide concentration
Blight intensity
Ctemperature
Dwater availability
Mark scheme
6Oct / Nov 2019 · Paper 11 · Q5Show mark scheme →
Acarbon dioxide in, oxygen in, water in
Bcarbon dioxide in, oxygen out, water in
Ccarbon dioxide out, oxygen in, water out
Dcarbon dioxide out, oxygen out, water out
Mark scheme
7Oct / Nov 2019 · Paper 11 · Q6Show mark scheme →
Aextra carbon dioxide
Bextra dissolved nitrates
Clower light intensity
Dlower oxygen concentration
Mark scheme
8Oct / Nov 2019 · Paper 11 · Q28Show mark scheme →
AThe bubbles are carbon dioxide produced during photosynthesis. The plants are getting their energy from the Sun.
BThe bubbles are carbon dioxide. The plants are getting their energy for photosynthesis from respiration.
CThe bubbles are oxygen produced during photosynthesis. The plants are getting their energy from the Sun.
DThe bubbles are oxygen. The plants are getting their energy for photosynthesis from the minerals absorbed through their roots.
Mark scheme
9Oct / Nov 2019 · Paper 12 · Q5Show mark scheme →
A1 + 8 → 6 + 7
B3 + 4 → 1 + 2
C6 + 7 → 1 + 8
D6 + 7 → 5 + 8
Mark scheme
10May / June 2019 · Paper 11 · Q6Show mark scheme →
Agraph 1: carbon dioxide concentration; graph 2: light intensity
Bgraph 1: carbon dioxide concentration; graph 2: temperature
Cgraph 1: temperature; graph 2: carbon dioxide
Dgraph 1: temperature; graph 2: light intensity
Mark scheme
11May / June 2019 · Paper 11 · Q7Show mark scheme →
AW and X
BX only
CY and Z
DY only
Mark scheme
12May / June 2019 · Paper 12 · Q6Show mark scheme →
Acarbohydrate + carbon dioxide → oxygen + water
Bcarbohydrate + oxygen → carbon dioxide + water
Ccarbon dioxide + water → carbohydrate + oxygen
Doxygen + water → carbohydrate + carbon dioxide
Mark scheme
13May / June 2019 · Paper 12 · Q7Show mark scheme →
Aa plant in a closed jar with no access to carbon dioxide
Ba plant that has white patches on its leaves
Ca plant with black paper pinned to both sides of one leaf
Da plant with wilted leaves
Mark scheme