Nitrogen Fixation: Quiz

Move the mouse over all of this photo for a more detailed description of a root nodule then answer the following question:

Why are vascular bundles present in nodules?

Xylem is required to transport the nitrogenous products from the nodules to other parts of the plant

Phloem is required to transport the nitrogenous products from the nodules to other parts of the plant

Secondary thickening in the walls of the xylem vessels strengthens the nodule

try again

Yes, mineral nutrients are transported away from the nodule in the xylem.

Well done, you answered correctly. Use the 'next' button to proceed.

No, the nitrogenous products from the nodule are transported in the xylem. However, in addition to supplying the bacteroids in the nodule with sugars, the phloem also acts as a source of water to the nodule.
No, while it may infer some structural strength, the main role of vascular tissue is in the transport of water and nutrients.
nitrogen03.swf nitrogen3 nitrogen3 nitrogen3 nitrogen3 nitrogen3 nitrogen3 nitrogen3 nitrogen3 nitrogen3 nitrogen3 nitrogen3

Transverse section of a root nodule.

Move the mouse over the text below for different tissues in the section...

Uninfected cortical cells

Vascular bundle

Cells containing bacteroids