Question

which is a tough and rigid layer that surrounds plant cells, as well as some algal and bacterial cells?
○ cell wall
○ centriole
○ nucleus
○ cell membrane

Explanation:

To solve this, we analyze each option:

• Centriole: Involved in cell division (animal cells mainly), not a rigid layer around cells.
• Nucleus: Contains genetic material, is an organelle inside the cell, not a surrounding layer.
• Cell membrane: Flexible, semi - permeable, not rigid (and present in all cells, but not the rigid outer layer for plant/algal/bacterial cells).
• Cell wall: Tough, rigid, and surrounds plant, some algal, and bacterial cells, providing structure and protection.

Answer:

A. cell wall