Transport Processes

Transport Processes

Monday 22nd February 2021

Transport Processes

• We have now looked at three ways in which 'stuff' can be transported in biology.

• Diffusion

• Osmosis

• Active Transport

Diffusion

• Substances move from a high to low concentration down a concentration gradient.

• This is a passive process, which means that it does not need any energy.

Multiple Choice

TRUE OR FALSE? Diffusion acts against a concentration gradient.

• True

• False

Open Ended

Using the words diffusion, concentration gradient, oxygen and carbon dioxide, explain how the movement of gases occurs during photosynthesis in the leaf.

Osmosis

• Water moves from a high to a low concentration across a partially permeable membrane and down a concentration gradient.

• This is a passive process, which means that it does not need energy.

• Osmosis is a type of diffusion.

Multiple Choice

What process do plants carry out to convert water and carbon dioxide into oxygen and glucose?

• respiration

• diffusion

• photosynthesis

• absorption

Osmosis

• HYPERtonic - if the concentration of the solutes in the solution outside of the cell is higher than inside.

• HYPOtonic - if the concentration of the solutes in the solution outside of the cell is lower than inside.

• ISOtonic - the solution of the solutes in the solution outside of the cell is the same as inside.

Open Ended

What has happened to the plant cell in the middle picture?

Open Ended

The movement of oxygen from our alveoli (in our lungs) and into our blood occurs by diffusion. Why does it not occur by osmosis?

Active Transport

• Substances move against a concentration gradient.

• THIS IS NOT A PASSIVE PROCESS!

• Energy is required for active transport to occur!

Multiple Choice

What process do mammals use to produce energy?

• respiration

• photosynthesis

• breathing

• sleeping

Multiple Choice

TRUE OR FALSE? Active transport acts along a concentration gradient.

• TRUE

• FALSE

Open Ended

How does active transport differ to diffusion?