Active and Passive Transport - Worksheet | Printable and Distance ... - Free Printable

Let’s look at the question:
Q.3. Which of the following is not a type of passive transport?

We are given four options:
a) Diffusion
b) Endocytosis
c) Facilitated Diffusion
d) Osmosis

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First, let’s remember what passive transport means.
Passive transport is when molecules move across the cell membrane without using energy (ATP). They just go from where there’s more of them to where there’s less — like rolling downhill.

Now let’s check each option:

- Diffusion → This is when small molecules (like oxygen or carbon dioxide) move directly through the membrane without help. No energy needed. ✔ Passive.

- Facilitated Diffusion → This is like diffusion, but bigger or charged molecules need a helper protein to get through. Still no energy used. ✔ Passive.

- Osmosis → This is just diffusion of water. Water moves from high water concentration to low water concentration. No energy needed. ✔ Passive.

- Endocytosis → This is when the cell wraps its membrane around something outside and pulls it in — like eating! The cell has to use energy (ATP) to do this. ✘ NOT passive — it’s active transport.

So, the one that is not passive transport is Endocytosis.

Final Answer:
b) Endocytosis