Transport Of Substances Flashcards
What is diffusion and where does it take place.
The movement of particles from an area of high concentration to lower concentration in gases and liquids
Examples of things that diffuse
Water, glucose and amino acids
Is diffusion passive?
Yes - it doesn’t require energy
How does concentration affect diffusion?
The larger the concentration gradient, the higher the rate of diffusion
How does temperature affect diffusion?
The higher the temperature, the more particle energy meaning they move faster and diffuse quicker
How does surface area affect the rate of diffusion?
Larger surface area = higher rate of diffusion
What is osmosis?
Movement of water molecules across a partially permeable membrane, from a region of high water concentration to low
How does osmosis move?
Down the concentration gradient.(high -> low.)
What is active transport?
Movement of molecules against the concentration gradient using energy from cellular respiration
What does cellular respiration do?
Breaks down the glucose in the mitochondria to release energy.
Adaptations of a root hair cell?
Lots of mitochondria for active transport and a large surface area
Why do root hair cells use active transport?
Because the inside of the cell has a higher concentration than the soil
