Concept:Plastids are membrane-bound organelles that are characteristic of plant cells and algae.Explanation:Mitochondria and ribosomes are present in both plant and animal cells.Lysosomes are common in animal cells but are rarely found in mature plant cells.Plastids, such as chloroplasts, are found only in plant cells and some algae.Therefore, the organelle that is exclusive to plant cells among the given options is plastids.Answer:D. Plastids