Question

What happened after reformation of nuclear envelope in M-phase?

• A. Decondensation of chromosomes and appearance of nuclear lamina.
• B. Transcription of chromosomes and reassembly of nuclear lamina.
• C. Formation of phragmoplast and contractile ring.
• D. Formation of contractile ring and transcription from chromosomes.

Answer 1

The correct option is C Formation of phragmoplast and contractile ring.

• The nuclear envelope reformed in telophase of M-phase. During cell division, the division of the protoplast of a cell into two daughter cells after nuclear division takes place in cytokinesis.
• In plant cells, cytokinesis takes place by two methods, i.e., cleavage and cell-plate method.
• In the cell-plate method, the central part of the spindle grows in size and forms a complex called phragmoplast. The phragmoplast reaches the equator and fused to form a cell plate. This cell plate later forms the primary wall and both the cell separate out.
• In animal cells, during cytokinesis, the contractile ring is formed which is composed of filamentous actin and the motor protein, and some additional proteins.

Hence, the correct answer is option C, i.e., Formation of phragmoplast and contractile ring.