CBSE Class 9 Science Cell: The Building Block of Life (Class 9 NCERT New) Quiz 7

1. What is the term for the movement of water through a selectively permeable membrane?

A Simple diffusion B Osmosis C Active transport D Endocytosis

2. What is the net movement of particles from a higher concentration to a lower concentration without requiring a membrane called?

A Osmosis B Plasmolysis C Diffusion D Active transport

3. How do plant roots primarily absorb water from the surrounding soil?

A Active pumping B Capillary action C Osmosis D Facilitated diffusion

4. What type of solution has a solute concentration that is completely equal to the solute concentration inside the cell?

A Hypotonic solution B Hypertonic solution C Isotonic solution D Saturated solution

5. If the solute concentration of the extracellular medium is less than the intracellular medium, the solution is:

A Isotonic B Hypertonic C Hypotonic D Super-saturated

6. If a cell is placed in a hypertonic solution, what will be the net movement of water?

A Water will move into the cell. B Water will move out of the cell. C There will be absolutely no movement of water. D Solute will move into the cell instead of water.

7. What is the average structural thickness of a typical cell membrane?

A 7 to 10 micrometers (μm) B 7 to 10 nanometers (nm) C 1 to 2 millimeters (mm) D 100 to 200 nanometers (nm)

8. Which widely accepted model explains the structural arrangement of lipids and proteins in the cell membrane?

A Lock and Key model B Fluid-mosaic model C Sandwich model D Unit membrane model

9. Structurally, the cell membrane consists of how many layers of fat molecules?

A A single layer B A lipid bilayer C Three lipid layers D A protein bilayer

10. In a cell membrane's lipid bilayer, how are the lipid molecules oriented?

A Water-repelling tails outward, water-attracting heads inward B Water-attracting heads outward, water-repelling tails inward C Both heads and tails face completely outward D Heads face left, tails face right