Which stage is indicated by the given figure?

In which phase do the sister chromatids separate?

$A$ student observed a slide of mitosis under the microscope and noted that the chromosomes were positioned at the opposite poles. Which stage was the student observing?

Which of the following serves as a mitotic spindle poison?

During mitosis,when does the endoplasmic reticulum and nucleolus begin to disappear?

Which effect is imparted by colchicine?