quiz 19 Flashcards
Name 3 processes by which substances are transported in and out of cells
diffusion,active transport and osmosis
Define active transport
the movement of particles from a low to high concentration which requires energy
Why should we calculate the percentage change in mass when investigating osmosis in plant tissues?
To be able to compare the changes in mass of plant tissues due to the variation in initial mass
What do plants need mineral ions for?
healthy growth
What is the relationship between temperature and the rate of diffusion?
As temperature increases, rate of diffusion increases
Which plant cells carry out active transport?
Root hair cells
Why do root hair cells carry out active transport?
To absorb mineral ions from the soil
Why do exchange surfaces have thin membranes?
For a short diffusion pathway
How can water uptake through osmosis be measured?
By looking at changes in mass
What does a negative percentage change in mass mean?
That the plant tissue has lost mass
What is the relationship between temperature and rate of diffusion?
As the concentration gradient increases, the rate of diffusion increases
When investigating the effect of sugar solution on osmosis in potato cylinders, what is the independent variable?
concentration of sugar solution
Give an example of a substance that commonly moves out of cells
carbon dioxide, urea
