excretion Flashcards
1
Q
how do plants perform excretion?
A
toxic waste = vacuoles “sealed off”
2
Q
what are the least toxic to most toxic nitrogenous waste?
A
- uric
- urea
- ammonia
3
Q
how do protists (algae) perform excretion?
A
diffusion in aquatic environment
- they are photosynthetic
4
Q
how do protozoans perform excretion?
A
h2o movement thru osmosis, collects within contractile vacuoles and uses active transport. the contractile vacuoles burst at the cell surface
5
Q
how do plants’ excess gases diffuse?
A
they diffuse via:
- stomates on leaves
- micro openings on stems
- epidermal cells on roots
6
Q
how do humans excrete?
A
gas = lungs
h2o, na, urea = kidney
