plant nitrogen fixation

Question 1

what happens in the small protein of the nitrogenous complex?

Answer 1

• ferredoxin oxidizes, releases an electron which goes to large protein
• creates energy by converting Fe III into Fe II

Question 2

what happens in the large protein of the nitrogenous complex?

Answer 2

• MoFeS takes in atmospheric N2
• MoFe III uses electron and energy to convert N2 into NH3

Question 3

what does leghemoglobin inside rhizobia nodules do?

Answer 3

protects nitrogenase by binding to O2

Question 4

describe the steps of rhizobia forming nodules

Answer 4

1) root hairs release flavonoids to attract rhizobia
2) rhizobia interacts with flavonoids and produces nod factors
3) rhizobia reproduce and spread through infection threads
4) infection threads bud and form clusters
5) nod factors bind signalling factors to membrane to trigger nodule formation

Question 5

what are epiphytes?

Answer 5

non-parasitic plants that use a host for leverage, but gets its own resources