AQA Biology P1 Mixed topics

The picture below is an example of _________________.

• osmosis
• isotonic
• diffusion
• active transport

Osmosis

• diffusion of water molecules through a semi-permeable mebrane from an area of low concentration to an area of high concentration
• the diffusion of particles from an area of high concentration to an area of low concentration
• diffusion of water molecules through a semi-permeable membrane from an area of high concentration to an area of low concentration
• the diffusion of particles from an area of low concentration to an area of high concentration

Which way will the water molecules move during osmosis?

• Out of the cell, so the cell shrinks.
• Out of the cell, so the cell swells.
• Into the cell, so the cell shrinks.
• Into the cell, so the cell swells.

What is diffusion?

• when molecules move from low concentration to high concentration

• when molecules move from high concentration to a low concentration

• no movement 
• molecules move everywhere

In winter, some people prefer to dilute their cordial with hot water instead of cold water.

How would using hot water affect the rate of diffusion ?

• It would make it faster

• It would make it slower

• It would not have any affect and rate would stay the same.

Oxygen moves from the alveoli into the blood by diffusion because there is a ____ _____________

of oxygen in the alveoli compared to the blood.

Carbon dioxide moves from the blood to the alveoli by diffusion because there is a ____ _____________

in the alveoli compared to the blood.

What are stem cells in plants ?

• Xylem

• Root hair cell

• Phloem

• Meristem

How are nerve cells adapted ? (Tick all that apply)

• Long projection carries electrical impulses around the body

• Dendrites to connect to other nerve cells

• Lots of mitochondria to provide energy for the tail

• Insulation to speed up electrical impulses

Do animal cells differentiate at an early stage of life ?

• Yes

• No