Active transport
3.2What the syllabus asks of you
- Understand active transport as the movement of molecules or ions into or out of a cell through the cell membrane, from a region of their lower concentration to a region of their higher concentration (i.e. against a concentration gradient), using energy released during respiration
- Explain the importance of active transport in ion uptake by root hair cells
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Chapter 3: Active transport
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Every question on Active transport, untimed, marked as you go.
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5 questions
1Oct / Nov 2020 · Paper 12 · Q3Also set in Oct / Nov 2020 Paper 11Show mark scheme →
Aactive transport / active transport
Bactive transport / diffusion
Cdiffusion / active transport
Ddiffusion / diffusion
Mark scheme
2May / June 2020 · Paper 11 · Q11Show mark scheme →
ATheir cell membranes are partially permeable.
BThey have a large surface area.
CThey have a lower water potential than the soil.
DThey take up ions more slowly in low oxygen concentrations.
Mark scheme
3May / June 2020 · Paper 12 · Q2Show mark scheme →
Aabsorption of carbon dioxide by a palisade cell
Babsorption of oxygen by a mesophyll cell
Cnitrate uptake by root hair cells
Dtransport of water up through the xylem
Mark scheme
4Oct / Nov 2019 · Paper 11 · Q3Show mark scheme →
Auptake of glucose by villi
Buptake of oxygen by root hair cells
Cuptake of starch by villi
Duptake of water by root hair cells
Mark scheme
5Oct / Nov 2019 · Paper 12 · Q2Show mark scheme →
A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 only
Mark scheme