Which one of the following plant plastids stores starch, oil and protein granules?

Plastids are specialized organelles found in plant cells, categorized based on their pigments and functions. While chloroplasts contain chlorophyll for photosynthesis [2] and chromoplasts provide color, leucoplasts are non-pigmented plastids primarily responsible for storage [1]. Leucoplasts are further classified into three specialized types based on the specific substances they store: amyloplasts store starch (carbohydrates), elaioplasts (or oleoplasts) store oils and lipids, and proteinoplasts (or aleuroplasts) store protein granules [1]. These storage plastids are typically found in non-photosynthetic tissues such as roots, bulbs, and seeds [1]. While chloroplasts may temporarily store starch produced during photosynthesis, the bulk storage of starch, oils, and proteins is the defining characteristic of leucoplasts [1]. Therefore, leucoplast is the correct plastid that encompasses the storage of all three mentioned substances.

Sources

1. [2] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 2: The Invisible Living World: Beyond Our Naked Eye > A step further > p. 13
2. [1] https://en.wikipedia.org/wiki/Leucoplast