Final answer:
Leucoplasts are plastids found in plant cells, with amyloplasts synthesizing starch and elaioplasts synthesizing oils.
Step-by-step explanation:
Two common types of leucoplasts are amyloplasts, which synthesize starch, and elaioplasts, which synthesize oils. Amyloplasts are responsible for the storage of starches, a form of sugar that plants use for energy storage. Leucoplasts do not contain pigments and are predominantly found in non-photosynthetic tissues of plants where they carry out the synthesis of important biomolecules and in some cases, store nutrients.
Leucoplasts evolved from an endosymbiotic relationship where an ancestral eukaryotic cell engulfed a photosynthetic cyanobacterium, a process that also gave rise to other plastids such as chloroplasts. This group of plastids is crucial for functions including photosynthesis (in the case of chloroplasts), storage (amyloplasts for starch, elaioplasts for oil), and synthesis of molecules such as fatty acids and amino acids.