5.5 Osmosis

Question 1

What is cytolysis

Answer 1

Bursting of an animal cell
caused by increased hydrostatic pressure
due to water moving in by osmosis

Question 2

What happens to an animal cell when it is submerged in a:
a. Solution which is isotonic to the cell
b. Solution which is hypotonic to the cell
c. Solution which is hypertonic to the cell

Answer 2

a. No change to cell, ∵ water potential is equal in both solutions, so no net movement of water.
b. Cytolysis (cell bursts), ∵ water potential is lower in cell than in surrounding solution, so water moves into cell.
c. Crenation, ∵ water potential is lower in surrounding solution, so water moves out of cell.

Question 3

What is osmosis

Answer 3

Movement of water
across partially permeable membrane
from high to low water potential.
Passive process.

Question 4

What’s hydrostatic pressure

Answer 4

Pressure created by water in an enclosed system

Question 5

What happens to a plant cell in a hypertonic solution

Answer 5

What’s potential is higher inside the cell net movment of water out the cell it becomes flaccid and cytoplasm shrinks so the cell becomes palsmolysed

Question 6

What happens to a plant cell in a hypotonic solution

Answer 6

Water potential is higher outside the cell net movement into cell the vacule swells and it becomes turgid