9.1 Flashcards
1
Q
The continuous movement of water from sources to sinks
A
Transpiration
2
Q
Main photosynthetic tissue
A
Palisade Mesophyl
3
Q
Provides surface for gas exchange
A
Spongy mesophyl
4
Q
Small gaps in the lower epidermis which allow for gas exchange
A
stoma
5
Q
Prevents excess water loss
A
waxy cuticle
6
Q
produces waxy cuticle and prevents water loss
A
epidermis
7
Q
main water transport vessel
A
xylem
8
Q
main vessel for organic molecules
A
phloem
9
Q
What main function of the root
A
- absorb water and mineral (by osmosis)
10
Q
walls of the xylem are impregnated with this so they don’t collaps
A
lignen
11
Q
Why can water be pulled from roots to the top by transpiration?
A
- water pressure is high at the roots and low in the leaves which creates a pressure gradient
- adhesive properties of water lets water molecules adhere to xylem and move up
- choesive properties of water allow it to stick to one another creating a continuous stream
12
Q
plants adapted to saline soil
A
halophytes
13
Q
what are some adaptions of halophytes?
A
- high concentration of potassium and sugars in their cytoplasm so less water from the soil enters
14
Q
plants adapted to life in dry habitats
A
xerophytes
15
Q
what are some adaptions of xerophytes?
A
- thick waxy cuticle
- stomata open at night
