Question

a student is examining leaf cells. which organelles are missing from the cells?
○ ribosomes
○ chloroplasts
○ centrioles
○ mitochondria

Explanation:

1. Recall the organelles in plant (leaf) cells: Ribosomes are present in all cells for protein synthesis. Chloroplasts are in plant cells (especially leaf cells) for photosynthesis. Mitochondria are in all eukaryotic cells for energy production.
2. Centrioles: These are typically found in animal cells and some lower plant cells, but not in higher plant leaf cells. So leaf cells lack centrioles.

Answer:

C. centrioles