Who this is for: Cambridge IGCSE Biology (0610) students who want active transport — movement against a concentration gradient using energy — to become reliable marks instead of a process they confuse with diffusion.
What query it owns: how to understand and revise active transport in Cambridge IGCSE Biology.
Why this is safe: this page owns the active transport revision-guide angle, while Tutopiya’s Active Transport subtopic page owns the learning resource and the free Active Transport quiz owns the practice.

Active transport moves substances against their concentration gradient — from low to high concentration — using energy from respiration, usually via carrier proteins in the cell membrane. Cambridge IGCSE Biology (0610) tests the definition, comparisons with diffusion and osmosis, and applications such as mineral ion uptake by root hair cells and glucose absorption in the ileum. This guide covers the syllabus content and exam wording.

Key takeaways

• Active transport moves substances against a concentration gradient — low → high concentration.
• It requires energy from respiration (ATP) and often involves carrier proteins.
• Diffusion and osmosis are passive; active transport is not.
• Classic examples: mineral ions into root hair cells, glucose into blood in the small intestine.
• Compare questions demand a clear contrast on gradient direction and energy.

What is active transport in Cambridge IGCSE Biology?

Active transport is the movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration, using energy from respiration. Carrier proteins in the membrane bind to specific molecules, change shape, and release them on the other side. This allows cells to accumulate substances they need even when the external concentration is low — essential for mineral uptake in plants and nutrient absorption in animals.

Read the full explanation on Tutopiya’s Active Transport subtopic page before attempting questions.

The core ideas you must master

Idea	What it means	How the exam uses it
Against gradient	Low → high concentration	”Define active transport”
Energy from respiration	ATP powers carrier proteins	”State the energy source”
Carrier proteins	Specific, membrane-bound	”Explain how ions enter root hairs”
Selective	Specific substances only	”Compare with diffusion”
Examples	Root hairs, ileum, kidney tubules	”Give an example of active transport”

Active transport vs diffusion vs osmosis

Process	Direction	Energy needed?	Substance
Diffusion	High → low concentration	No	Dissolved particles / gases
Osmosis	High → low water potential	No	Water only
Active transport	Low → high concentration	Yes (respiration)	Specific ions / molecules

Active transport in past-paper wording: command words that matter

Command word / phrase	What the question wants	Typical active transport stem
Define	Full definition with gradient + energy	”Define the term active transport.”
Explain	Mechanism + example	”Explain how root hair cells absorb nitrate ions.”
Compare	Similarities and differences	”Compare diffusion and active transport.”
State	Short fact	”State the source of energy for active transport.”
Suggest	Apply to context	”Suggest why active transport stops if respiration is inhibited.”

Worked exam-style stems (how to answer the wording)

1. “Define the term active transport.” Active transport is the movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration, using energy from respiration. Mark-scheme reward: against gradient, energy from respiration, membrane.
2. “Explain how mineral ions are absorbed by root hair cells when their concentration in the soil is low.” Ions are at lower concentration in soil than in the cell → cannot enter by diffusion alone → active transport via carrier proteins powered by respiration moves ions against the gradient. Reward: low soil concentration acknowledged + energy link.
3. “Compare diffusion and active transport.” Both involve movement across membranes; diffusion is passive (high to low, no energy), active transport is against the gradient and requires energy from respiration. Reward: contrast on gradient and energy in both columns.

Use the Movement topical past paper questions and Active Transport quiz to confirm understanding.

How active transport connects to the rest of the syllabus

Active transport complements Diffusion and Osmosis. It links to respiration (energy supply), plant nutrition, and human digestion. The Cambridge IGCSE Biology resource hub connects all Movement subtopics.

Common mistakes students make

• Saying active transport moves with the gradient (that is diffusion).
• Omitting energy from respiration in definitions.
• Treating active transport as non-selective like simple diffusion.
• Confusing facilitated diffusion (passive, with proteins) with active transport.
• Giving osmosis as an example of active transport.

When you need more support

If compare questions keep failing, use the Movement topical past paper questions and Active Transport quiz, then book a Cambridge IGCSE Biology tutor.

Frequently asked questions

Does active transport need energy? Yes — energy from respiration (ATP) powers carrier proteins to move substances against a concentration gradient.

What is a common example of active transport in plants? Uptake of mineral ions (e.g. nitrate) by root hair cells when soil concentration is low.

How is active transport different from diffusion? Diffusion is passive movement down a gradient; active transport moves substances against the gradient using energy.

How do I revise active transport effectively? Learn the definition, complete a three-way comparison table with diffusion and osmosis, then take the Active Transport quiz.

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