Question

Which of the following statements about Rhizobium legume nodule formation is not true?

• A. Rhizobium can only fix nitrogen after it become a Bacteroide within a root cortex cell
• B. Rhizobium induces invagination of root hairs
• C. Within an infection thread, Rhizobium is till extracellular to the plant
• D. The infection thread can fuse with any root cell of an appropriate legume species

Answer 1

The correct option is D The infection thread can fuse with any root cell of an appropriate legume species

The infection thread can fuse with any root cell of an appropriate legume species. Infective threads fuse preferentially with root cortex cells.
So, the correct option is option D.