The common thing in plant and animal cell is

1. Analyze the question The question asks which structure is found in both plant cells and animal cells. So we are looking for the one organelle or structure that is shared, not one that belongs to only one type of cell.

2. Explain the concept Plant and animal cells are both eukaryotic cells. They share these structures:

• Cell membrane
• Cytoplasm
• Nucleus
• Mitochondria
• Endoplasmic reticulum
• Ribosomes
• Golgi apparatus

Some structures are different:

• Plant cells only: cell wall, chloroplasts, large permanent vacuole
• Animal cells only (typically): centrioles, which are absent in higher plants

3. Solve step by step

• A. Chloroplast: found only in plant cells (for photosynthesis). Animal cells do not have it. ✗
• B. Cell wall: found only in plant cells (made of cellulose). Animal cells have only a cell membrane. ✗
• C. Nucleus: found in both. It contains the genetic material (DNA) and controls cell activities. ✓
• D. Centrioles: present in animal cells and absent in higher plant cells. They help in spindle formation during cell division. ✗

4. Answer The correct option is C. Nucleus.

5. Tip For "common to both" questions, think of the basic parts of any eukaryotic cell: nucleus, cytoplasm, cell membrane, mitochondria. Chloroplast and cell wall are the usual "plant only" distractors. Remember "CC-W": Chloroplast, Cell wall and large vacuole are plant-only.