[Campbell Biology P.865] According to Figure 37.13, which of the following events occurs imm... | Practice Question

According to Figure 37.13, which of the following events occurs immediately after the infection thread penetrates the root cortex?

  • A: Roots emit chemical signals to attract bacteria.
  • B: The mature nodule grows and forms a layer of sclerenchyma cells.
  • C: Cells of the cortex and pericycle begin dividing and fusing to form the nodule.
  • D: The nodule develops vascular tissue.

Explanation

Figure 37.13, step 2 describes the infection thread penetrating the root cortex, and mentions that cells of the cortex and pericycle begin dividing. Step 3 immediately follows, stating that growth continues in these regions and these masses of dividing cells fuse, forming the nodule.