May

Question 1

What processes require diffusion and what is the diffusion process in and out of cells?

Answer 1

Respiration-oxygen in carbon dioxide out

Photosynthesis-carbon dioxide in oxygen out

Question 2

What does respiration and photosynthesis require?

Answer 2

These processes take place as a series of chemical reactions and therefore needs chemicals to get in to a cell. They produce chemicals to leave a cell.

Question 3

Describe the experiment of diffusion of potassium permanganate:

Answer 3

The process of diffusion of potassium permanganate particles move from an area of high concentration to an area of low concentration. The process finishes when the particles are evenly dispersed(an isotonic concentration-when there’s no net diffusion)

Question 4

Describe an experiment to show osmosis by using visking tubing:

Answer 4

When a visking tube is filled with water and surrounded by water there is no net movement. Where as when a visking tube is filled with water and put in a sugar solution and because there was then a lower water concentration around the visking tubing so the water diffused out of the visking tube.

Question 5

Describe the effects of osmosis in animal cells:

Answer 5

Normal red blood cells in the blood are in an isotonic solution.
Shrivelled red blood cells happen when the blood has a low water concentration so the water in the red blood cell has diffused into the blood plasma.
Swelled red blood cells are swollen because the blood has a high water concentration so the water has diffused into the cell so it has swelled and will eventually burst.

Question 6

Describe an experiment to investigate the effects of exercise on humans:

Answer 6

You can measure your amount of breaths per minute before exercise and then after exercise and you can see the difference in the heart rate.