In plant tissue, what structure forms the rigid outer layer of a plant cell?

• A. Cytoskeleton
• B. Plasma membrane
• C. Tonoplast
• D. Cell wall

Answer: (D)

Verified step by step guidance

1. Identify the main components of a plant cell that contribute to its structure and protection.
2. Understand that the cytoskeleton is an internal framework that supports the cell's shape but does not form the outer layer.
3. Recognize that the plasma membrane is a flexible boundary controlling substance movement but is not rigid.
4. Know that the tonoplast is the membrane surrounding the central vacuole, not the outer layer.
5. Conclude that the cell wall is the rigid outer layer providing structural support and protection to plant cells.