Unit 2 Movement of Particles

Diffusion is the movement of molecules from an area of _____ concentration to an ______ concentration

• High, low

• Low, high

• Low, low

• High, high

The picture below is an example of _________________.

• osmosis

• isotonic

• diffusion

• active transport

What is diffusion?

• when molecules move 
• when molecules move from a high concentration to a low concentration.
• no movement 
• molecules move everywhere

During osmosis

• water moves from high to low concentration
• large or oddly shaped molecules move across a cell membrane
• water moves when energy is used
• proteins are built

Which is true about active transport?

• It requires energy
• it does not require energy
• It moves substances down the concentration gradient
• it moves material from high to low concentration

Which of the following is a sample of osmosis?

• plant root absorbing mineral ions from the soil

• the scent from a bunch of flowers spreads throughout a room

• carbon dioxide move from air into leaves through stomata.

• plant root absorbing water from the soil

The diagram shows an experiment using a potato. Which shows the result of the experiment after 24 hours?

• 
• 
• 
• 

What happens to a cell placed in a HYPERTONIC solution

• It shrinks
• It swells
• Nothing happens

Which of the following is true about active transport?

• it does not need energy

• it involves carrier proteins in the cell membrane

• it produces ATP

• it moves substances from a high to a low concentration

Why do animal cells burst in pure water solutions but the plant cells do not?

• Animals cells are weak.

• Plant cells have a cell wall to prevent bursting.

• Plant cells are stronger than animal cells.

• This is something that just naturally happens.