Question

question 4
which of the following features likely accounts for the difference between plant and animal cell cytokinesis?

1. animal cells lack the microfilaments required for forming a cleavage furrow.
2. animal cells lack chloroplasts.
3. plant cells have cell walls.
4. plant cells have two sets of chromosomes; animal cells have one set of chromosomes.

Explanation:

• Option 1: Animal cells have microfilaments that form a cleavage furrow during cytokinesis. So this option is incorrect.
• Option 2: Chloroplasts are related to photosynthesis, not cytokinesis. So this option is incorrect.
• Option 3: Plant cells have cell walls. During cytokinesis, a cell plate forms (due to the presence of cell - wall - related components like cellulose synthesis), while animal cells form a cleavage furrow. This difference in structure (cell wall in plants) accounts for the difference in cytokinesis.
• Option 4: Both plant and animal somatic cells are diploid (have two sets of chromosomes in most cases). Gametes (in both plants and animals) are haploid. So this option is incorrect.

Answer:

1. Plant cells have cell walls.