What Is the Right Sequence of Steps During Infection of Plants

Multiple Choice

What is the right sequence of steps during infection of plants by nitrogen-fixing bacteria?

A) Rhizobia release Nod factors;roots release flavonoids;rhizobia proliferate inside of root hair;infection thread grows into the root cortex;nodule forms.
B) Rhizobia release flavonoids;roots release Nod factors;rhizobia proliferate inside of root hair;infection thread grows into the root cortex;nodule forms.
C) Roots release flavonoids;rhizobia release Nod factors;rhizobia proliferate inside of root hair;nodule forms;infection thread grows into the root cortex.
D) Roots release flavonoids;rhizobia release Nod factors;rhizobia proliferate inside of root hair;infection thread grows into the root cortex;nodule forms.
E) Nodule forms;infection thread grows into the root cortex;rhizobia proliferate inside of root hair;rhizobia release flavonoids and Nod factors.