For an organism to function, substances must move into and out of cells. Three processes contribute to this movement – diffusion, osmosis and active transport.
Which process do plants use to absorb nitrates from the soil?
Which factor will decrease the rate of diffusion across a membrane?
Increasing the surface area of the membrane
Increasing the differences in concentration outside and inside the membrane
Decreasing the temperature
What happens to red blood cells when they are placed in water?
They shrivel as water is lost by osmosis
The cells are unchanged as water moves in and out by osmosis
The cells swell up and may burst
Which of the following is a correct statement about osmosis?
Water moves from a concentrated solution to a dilute solution across a partially permeable membrane
Water moves from a region of high concentration to a low concentration across a partially permeable membrane
Water and sugar move from a region of high concentration to a low concentration by osmosis
Which of the following involves passive movement?
The movement of glucose through the gut wall into the blood
The movement of carbon dioxide into a leaf
The movement of mineral ions into a plant root hair cell
In which direction do water particles move in osmosis?
High to low concentration
Low to high concentration
They don't move
What substance moves by osmosis?
What happens to diffusion if the temperature is increased?
It stays the same
What must water molecules move through in osmosis?
A cell wall
A partially permeable membrane
A totally permeable membrane
What happens to plant cells that are put into a concentrated solution?