Question

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

Explanation:

Leaves are plant organs. Chloroplasts are organelles in plant cells that carry out photosynthesis. Mitochondria are found in both plant and animal cells (for energy production). Centrioles are mainly in animal cells (involved in cell division). Ribosomes are in both (for protein synthesis). Since it's leaf cells (plant), centrioles are missing as they are not typical in most plant cells (except some lower - plant gametes).

Answer:

centrioles