3.3- plants

Question 1

Why do plants need a transport system?

Answer 1

To move:

1) water and minerals from roots up to leaves
2) sugars from leaves to rest of plant

Question 2

What travels in the xylem tissue and what direction?

Answer 2

Water and soluble mineral ions travel upwards

Question 3

What travels in the phloem tissue and what direction?

Answer 3

Assimilates travel up or down

Question 4

What are dicotyledonous plants?

Answer 4

Plants with 2 seed leaves and a branching pattern of veins in the leaf.

Question 5

instead of “if co2 conc is low rate of photosynthesis drops” say

Answer 5

if co2 conc is low rate of photosynthesis cannot increase.

Question 6

why is it bad if a plant can only anaerobically respire?

Answer 6

ethanol is toxic

alcohol fermentation is irreversible

Question 7

how does water get into a root endodermis??

Answer 7

ions are actively pumped in, lowers water potential, water moves in by osmosis.

Question 8

why is lignin essential in the wall of a xylem vessel? (long)

Answer 8

provides, strength / support ;
keeps vessel tube, open + prevents collapse transpiration produces tension / negative
pressure ;
to waterproof the, cell / vessel / tube / wall ;
(so) cell, dies / content decays ;
to create a continuous column / allow unimpeded flow ;
to limit lateral flow of water ;
adhesion ;