17. Phosphorus and Mycorrhizae

Question 1

phosphorus is the __ most abundant element in a plant

Answer 1

5th

Question 2

pre-industry, P came from:

Answer 2

rocks! goes thru terrestrial and marine biological cycles –> sedimented into Earth’s crust

Question 3

post-industry, P comes from:

Answer 3

mining, still no atmospheric pool of P

Question 4

what is the downside of human addition of elements/nutrients into bio cycles?

Answer 4

fertilizers cause eutrophication

Question 5

a mycorrhizae is a:

Answer 5

symbiotic relationship between plants and fungi

Question 6

roots cause a ____ around their roots to get nutrients

Answer 6

depletion zone

Question 7

what does the fungi provide in the relationship?

Answer 7

provides increased water and nutrient absorption capabilities because they have a wider reach

Question 8

2 types of fungi in mycorrhizal symbiosis:

Answer 8

ectomycorrhizae (EM) & endomycorrhizae/arbuscular (AM)

Question 9

arbuscule

Answer 9

fungi invade root cells and form little networks inside

Question 10

80% of plants use __ type of mycorrhizae

Answer 10

endomycorrhizal/arbuscular

Question 11

compare ecto and endo mycorhrizal fungi

Answer 11

ecto sits on top of root, does not invade
endo invades root cells and forms networks inside

Question 12

what are CMNs?

Answer 12

common mycorrhizal networks, connection of fungi below ground

Question 13

how does P exist in the soil?

Answer 13

adsorbed onto soil particles, insoluble