Xylem,phloem, Plants

Question 1

Root stem leaf

Question 2

Xylem

Answer 2

No end walls,cel cont= flow not imp
Narrow tubes= water c doesn’t break easily
Pits = lateral mvt water, blockage passed, supply water to other plants

Question 3

Phloem

Question 4

Xerophytes eg marram and cacti

Answer 4

thick waxy cuticle=stops uncontrolled evaporation through leaf cells, ext roots= max water uptake eg marram grass cacti

small leaf sa= less evap,Store water in stem=Fleshy and swollen source of water eg cacti

sunken stomata (in pits), rolled leaves and ,stomatal hairs (trichomes)= maintains humid air around stomata (decreased sy gradient)
marram grass

Question 5

Hydrophytes eg water lillies

Answer 5

Large air spaces=afloat and act as an oxygen store, Stem for buoyancy and allows oxygen to move from leaf down to the roots quickly

2. Stomata in upper surface= exposed to air
3. Flexible stems prev damage by water currents

Question 6

Xylem and lignin

Answer 6

Strengthen wall prev collapse
Waterproof, imp adhesion= cap
Spiral= flexibility