Question

Phragmoplast is precursor of [MP PMT 1994; MHCET 2001; Orissa JEE 2004]
A) Cell plate
B) Chloroplast
C) Chromoplast
D) Colourless plastid

Answer 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.

Answer 2

Option A - The cell plate is the precursor of Phragmoplast.

Explanation:

• Organelles are divided, daughter cells are generated that are genetically identical, and cells return to interphase during cytokinesis, which is the division of the cytoplasm to form two new daughter cells.
• Plant cells, unlike animal cells, cannot create furrows due to their stiff cell walls.
• Instead, a cell plate forms across the cell in the place of the former metaphase plate, separating the two developing cells during telophase.
• During telophase, membrane-enclosed vesicles generated from the Golgi apparatus migrate to the centre of the cell and fuse to create a cell plate, replacing the metaphase plate.
• The expanding cell plate gradually merges with the existing plasma membrane, resulting in the formation of two daughter cells, each with its plasma membrane.
• Because the cell wall is responsible for assisting in the formation of plants, it must be formed when a cell divides.
• Plants use phragmoplasts, which are microtubule spindle structures that transport vesicles of cell wall material to the new cell plate.

Hence, Option D is the correct answer.

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