Question

• What is phragmoplast?
• What is interzonal microtubules?

Answer 1

1)
The phragmoplast is a plant cell specific structure that forms during late cytokinesis. It serves as a scaffold for cell plate assembly and subsequent formation of a new cell wall separating the two daughter cells. The phragmoplast can only be observed in Phragmoplastophyta which includes the Embryophyta.

2)
The microtubule densities per micrsrneter-square cross-sectional area of the spindle were determined: the density of interzonal microtubules (i.e., those between the separating chromosomes in anaphase) was two to three times less than that of the kinetochore-associated microtubules, and the density of interzonal.