Plants 9.1 Transportation in the Xylem Flashcards Preview

Biology 9. Plants > Plants 9.1 Transportation in the Xylem > Flashcards

Flashcards in Plants 9.1 Transportation in the Xylem Deck (4)
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1

What does light trigger in a stomata?

active transport of K+ into the guard cells. The higher solute concentration causes inward water movement by osmosis

2

What causes the guard cells to become flaccid and close the stomata?

When transpiration rates need to be lowered, plant releases hormone, abscisic acid. this causes K+ to rapidly diffuse out of guard cell

3

What models can be used to show water transport in xylem?

- Potometers measures transpiration rates,
- chromotography paper (is made of cellulose so water rises up through it)
- Glass capillary tubes in water show how water adheres to glass so it rises (only does it in water)
- porous pots: show how water fills pores within pot to show adhesion, cohesion causes water to be drawn p the glass tube

4

What is hydrostatic pressure?

pressure in liquid