3.5.1c The Movement of Substances across the Plasma Membrane (Objective Questions)

Which of the following is true about osmosis?
I.      Movement of water molecules from a region of higher water concentration to a region of lower water concentration
II.    The process requires chemical energy
III.  The process involves a semi-permeable membrane
IV.   The process only occurs in non-living thing

The diagram shows the fluid mosaic model of a plasma membrane.

What are P and Q?

What is the process that transports substances across the plasma membrane with the help of carrier proteins without expending energy?

Which of the following processes is involved in the gaseous exchange in an alveolus?

Diagram shows the movement of molecule Y across the plasma membrane through a process.

Name the process