3.1.3 Transport in plants Flashcards
1
Q
how water moves from roots to leaves
A
- evaporation at top of, plant
- creates tension in xylem which pulls
water molecules stick together as cohesive
form a chain or column
2
Q
companion cells adaption
A
- many mitochondria
- plasmodesmata between companion cell
and sieve tube - many ribosomes / extensive RER ;
- many proteins in cell plasma membrane
3
Q
Explain why the potometer only gives an estimate of the rate of transpiration.
A
- potometer measures water uptake
- not all water (taken up) is lost
some water used in photosynthesis, making cells turgid
