Diffusion,osmosis And Active Transport Flashcards
Give an example of diffusion
When plants photosynthesise they use up co2 from the atmosphere and produce O2 these gases pass in and out of cells by diffusion
What does passive mean
It takes place without needing any energy
What is osmosis
The overall movement of water from a dilute to a more concentrated solution through a partially permeable membrane
What is a partially permeable membrane
One that only allows certain substances to diffuse through it
What is allowed to pass through a partially permeable membrane an what isn’t
Only allows small molecules like water to pass through however not larger molecules like sucrose
What happens when more water move In
The solution becomes more dilute
Give an example of osmosis
Plants take in water by osmosis
Why is water drawn by the root by osmosis
Because there is a higher concentration of water in the soil than there is inside the plant
What do the arrows on an osmosis diagram show
The net movement of water molecules
What is active transport
The overall movement of chemicals across a cell membrane from a region of lower concentration to a region of higher concentration using energy released by respiration
Give an example of active transport
Plants take in minerals like nitrates through their roots by active transport the concentration of minerals in root cells is normally higher than in the soil around them
What does active transport use energy from respiration for
To Move minerals from the soil into the root cells
What is diffusion
Diffusion is the passive overall movement of particles from a region of their higher concentration to a region of their lower concentration
