SB6c Absorbing water and mineral ions Flashcards
1
Q
Why is water needed?
A
.carry dissolved mineral ions
.keeps the cells rigid so the plant does not wilt
.cools the leaves by evaporating off
.photosynthesis
2
Q
Diffusion?
A
particles flowing from a high concentration to a low concentration, down a gradient
3
Q
Osmosis?
A
when a solvent (e.g.water) diffues through a semi-permeable membrane
4
Q
Active transport?
A
movement of mineral ions against their concentration gradient (low to high), using proteins and energy
5
Q
How does water flow from soil into the cytoplasm of a root hair cell?
A
Cell membranes are semi-permeable so water passes into the cytoplasm by osmosis
