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 tough outer layer.
• Nucleus: Contains genetic material, not a surrounding layer.
• Cell membrane: Flexible, present in all cells, but not tough/rigid like the structure around plant, algal, bacterial cells.
• Cell wall: Defined as a tough, rigid layer surrounding plant, some algal, and bacterial cells, providing structure and protection.

Answer:

A. cell wall