What is mycorrhiza? Is this a plant?

Which statement about mycorrhiza is false?

• a. Mycorrhiza is an association between a fungus and a plant b. The fungus fixes atmospheric nitrogen and makes it available to the plant c. Mycorrhiza involves a mutualistic relationship, wherein both partners profit d. Through its mycorrhizal partner, the plant gets a much better access to water e. The fungal partner gains sugar from its partner I think all of them are correct... thanks in advance

• Answer:

  B) is incorrect, all the other answers are common properties or correct statements about mycorrhiza. "Biological nitrogen fixation can be represented by the following equation, in which two moles of ammonia are produced from one mole of nitrogen gas, at the expense of 16 moles of ATP and a supply of electrons and protons (hydrogen ions): N2 + 8H+ + 8e- + 16 ATP = 2NH3 + H2 + 16ADP + 16 Pi This reaction is performed exclusively by prokaryotes (the bacteria and related organisms), using an enzyme complex termed nitrogenase. This enzyme consists of two proteins - an iron protein and a molybdenum-iron protein, as shown below. " - http://www.biology.ed.ac.uk/research/groups/jdeacon/microbes/nitrogen.htm "Kingdom Mycetae (=true fungi), have a more restrictive set of characteristics: Eukaryotes with cell wall material composed primarily of chitin and derive their nutrition by absorption." - http://www.botany.hawaii.edu/faculty/wong/bot201/myxomycota/introduction.htm