Test Paper – Active and Passive Transport

CLASS 9 BIOLOGY — TEST PAPER
Topic: Active and Passive Transport

Section A – Multiple Choice Questions
(Tick the correct option.)

1. Diffusion is the movement of molecules:
a) From low to high concentration
b) Using ATP energy
c) From high to low concentration
d) Only through protein channels

2. Osmosis is defined as:
a) Movement of solutes through a membrane
b) Movement of water through a semi-permeable membrane
c) Movement of gases across a cell
d) Active transport of ions

3. Active transport differs from diffusion because it:
a) Moves substances down the gradient
b) Requires no energy
c) Requires energy and moves against the concentration gradient
d) Occurs only in plants

4. In a hypertonic solution, an animal cell:
a) Swells and bursts
b) Shrinks and shrivels
c) Remains the same size
d) Becomes turgid

5. A plant cell placed in a hypotonic solution becomes:
a) Plasmolysed
b) Turgid
c) Flaccid
d) Shrunken

6. The sodium-potassium pump moves:
a) Na⁺ and K⁺ along their concentration gradients
b) Na⁺ out and K⁺ into the cell using ATP
c) Both Na⁺ and K⁺ out of the cell
d) Both Na⁺ and K⁺ into the cell

7. Which statement best describes a selectively permeable membrane?
a) Allows all molecules to pass freely