Yr7 B1.4 Movement of substances

What is diffusion?

• The movement of particles from a low concentration to a high concentration

• The movement of particles from a high concentration to a low concentration

• The movement of water through a cell membrane

Which two substances move into a body cell?

• Glucose and oxygen

• Carbon dioxide and water

• Protein and salt

What is one substance that moves out of a body cell as waste?

• Oxygen

• Carbon dioxide

• Glucose

Why do plants need water?

• To make the vacuole shrink and weaken the plant

• To help with photosynthesis and keep the plant upright

• To dissolve chlorophyll in the leaf

What happens to a plant when it does not receive enough water?

• The vacuole shrinks, and the plant wilts

• The chloroplasts disappear, and the plant turns brown

• The plant absorbs oxygen to stay alive

What is the process by which water moves into plant root hair cells?

• Diffusion

• Osmosis

• Evaporation

How does the smell of burnt toast spread through a house?

• Air particles move from a high concentration in the kitchen to a low concentration in other rooms

• The smell spreads through the walls of the house

• The particles stay in one place but become stronger over time

Why do root hair cells have a large surface area?

• To absorb more sunlight for photosynthesis

• To absorb more water and nutrients from the soil

• To store extra oxygen for the plant

What happens inside a healthy plant cell when it has enough water?

• The vacuole is full, pressing against the cell wall to keep the plant upright

• The cell membrane thickens to store extra water

• The nucleus controls how much water enters the cell

What happens to diffusion when the concentration of particles is equal on both sides?

• Diffusion stops completely

• Particles continue moving, but there is no net movement

• The particles move back to their original high concentration