Science

Question 1

Osmosis

Answer 1

A form of diffusion that involves water. The water content in a cell must remain the same. Osmosis allows cells to maintain this water limit and is extremely important for the life of the cell.

Question 2

Diffusion

Answer 2

The movement of particles from a higher concentration to a lower concentration.

Question 3

Permeable

Answer 3

Object allows water and air to easily pass through. E.g. Cotton, tissue

Question 4

impermeable

Answer 4

Object does not allow air or water to pass through. E.g. Plastic bag

Question 5

semi-permeable

Answer 5

Only allows some substances to pass through. E.g. Cell membrane

Question 6

Independent Variable

Answer 6

Type of water (Salt or Distilled)

Question 7

Dependent Variable

Answer 7

Size (Smaller, Bigger, Stays the same)

Question 8

Control Variables

Answer 8

Brand, Temperature, Water Level (amount), Time, Location, Size of Beaker.

Question 9

Osmosis in preserving food

Answer 9

Salt and sugar preserve food because they kill micro-organisms.

• Creates a lower concentration of water outside the cells of micro-organisms than inside their cells.
• Osmosis occurs when drawing water out of the micro-organisms until they are no longer functional.