Biology Unit B.2 review

In which state of matter are particles most free to move around?

• Gas

• Solid

• Liquid

Solid substances can diffuse.

• True

• False

Choose which sentence best describes Diffusion.

• Diffusion is the controlled movement of particles in a given volume. Particles move from an area of high concentration to low concentration. The higher the temperature, the faster a substance diffuses.

• Diffusion is the random movement of particles in a given volume. Particles move from an area of low concentration to high concentration. The higher the temperature, the faster a substance diffuses.

• Diffusion is the random movement of particles in a given volume. Particles move from an area of high concentration to low concentration. The higher the temperature, the faster a substance diffuses.

• Diffusion is the random movement of particles in a given volume. Particles move from an area of low concentration to high concentration. The lower the temperature, the faster a substance diffuses.

Please give an example of diffusion. You have 3 minutes, and you can look online. Try to find an interesting example.

Choose the correct sentence.

• Cell membrane are partially permeable to Oxygen, Carbon Dioxide and other substances.

• Cell membranes are freely permeable to Oxygen, Carbon Dioxide and other substances.

• Cell membrane are partially permeable to Oxygen and Carbon Dioxide, but they are freely permeable to other substances

• Cell membranes are freely permeable to Oxygen and Carbon Dioxide, but they are only partially permeable to other substances.

Diffusion of Oxygen and Carbon Dioxide into a cell will happen on it's own. The cell doesn't need to do anything.

• True

• False

Please provide a short answer to describe the role of diffusion in photosynthesis.

Please give one reason why water is important to living organisms.

Water can make up to.....

• 40% of an organism's body.

• 60% of an organism's body.

• 70% of an organism's body.

• 80% of an organism's body.

What is a better word to use than "water concentration"?

• Water saturation

• Water potential

• Water density

• Water capacity