What is the structure in plant cells that serves as the precursor for the developing cell plate during cytokinesis?
Answer and explanation
Correct answer: D. Phragmoplast
- Step 1: Because plant cells are encased in a rigid cell wall, cytokinesis cannot proceed by furrowing.
- Step 2: In late telophase, remnants of the interzonal spindle microtubules, actin filaments, and Golgi-derived vesicles assemble at the equator to form the phragmoplast.
- Step 3: Golgi vesicles fuse within the phragmoplast, depositing cell wall materials centrifugally outward until the cell plate merges with the parental cell wall.
Answer
Phragmoplast.
Why not the others: Tonoplast is the single membrane enclosing the central plant vacuole; Kinetochore is the centromeric protein structure that attaches microtubules; Centrosome is absent in higher plant cells.
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