Question

Name the stage in nuclear division described by each of the following sentences:
(i) disappearance of the nuclear membrane
..................................................................................................................
(ii) The nuclear membrane and nucleolus reappear
..................................................................................................................
(iii) The centromere divides and the chromatids move to opposite poles due
to the shortening of spindle fibres
..................................................................................................................
(iv) The chromosomes arrange themselves at the equatorial plane of the
spindle with the spindle fibres attached to the centromeres.
..................................................................................................................

Answer 1

Answer:

1. prophase

2. telophase

3. anaphase

4. metaphase

Answer 2

Answer:

1 prophase 2telophase 3anaphase 4 metaphase

Explanation:

1 disappearance of nuclear membrane occur in prophase  it the early stage of mititic cell divison and it deals with disappearance nuclear membrane and condensation of chromatin.

2 Reappearance of nuclear membrane and nucleolus occur during Telophase.during this stage chromatin undergo decondensation to its original shape that is present during interphase.The nuclear membrane reappear around the newly formed chromatin.During telophase disassembly of microtubules takes place.

3 The centromere divides and the chromatid moves to the opposite poles due to shortening of spindle fibres during Anaphase . which ultimately helps in segregation of chromosome and reappearance of the nucleus.

4 The chromosome arrange themselves at the equitorial plane of the spindle during Metaphase. it occurs after prometaphase.During metaphase chrosomes are alined in the metaphase plate.