Potato experiment

• Biologie
• Middelbare school
• havo
• Leerjaar 3

Potato experiment

Diffusion

The movement of a substance from an area of high concentration to an area of low concentration of that substance.

Diffusionspeed depends on the temperature.

actief/passief transport

active / passive transport

Osmosis

= diffusion of water through a semipermeable membrane

= the movement of water from a place with a low concentration to a place with a high concentration

water follow solute

Osmosis 

Osmosis in animal cells

hypotone solution OUTSIDE of the cell

water goes in by osmosis and the cells burst

isotone solution OUTSIDE of the cell

no osmosis, no difference in osmotic pressure

hypertone solution OUTSIDE of the cell

water leaves the cell through osmosis, the cells shrink

osmosis in a plant cell

Discussion #1: potato in demiwater

• The plant cells in the hypotone solution absorbed water through the process of osmosis. 
• The concentration in the cells was higher compared to the surroundings of the cells. 
• Osmosis is the movement of water from a low to a high concentration/osmotic pressure. 
• The mass (length and width, firmness) got larger, because of this water entering the plant cells. These cell were now in turgor/turgid.

Discussion #2: potato in 10% salt solution

• The plant cells in the hypertone solution lost water through osmosis. 
• The concentration surrounding the cells had a high osmotic pressure (high concentration). 
• Thus water moves from the low concentration (the cells) to the high concentration area (the surroundings). 
• Thus plasmolysis happened

WHAT*

Chapter 5

read 5.1

make excersises

read 5.2

make 5.2

HOW

in silence

laptop only for biology

NEED HELP

1. read well
2. raise your hand

get to work - CHAT