In which of the following organisms are chromoplasts present?

The correct option is Rose.

Explanation:

Chromoplasts are specialized organelles (a type of plastid) found in plant cells. They contain pigments other than chlorophyll, such as carotenoids (yellow, orange, and red pigments), which give distinct colors to flowers, fruits, and autumn leaves.

Let us analyze the given options:

1. Rose: A rose is a flowering plant. Plant cells contain plastids, including chromoplasts, which give bright red, pink, or yellow colors to its petals to attract pollinators.

2. Amoeba: A single-celled protozoan (animal-like organism) which does not possess plastids or chromoplasts.

3. Hydra: A multicellular aquatic organism belonging to the animal kingdom, so it lacks plant plastids like chromoplasts.

4. Star fish: An animal belonging to the phylum Echinodermata, which does not contain chromoplasts.

Therefore, chromoplasts are present only in the plant organism, which is Rose.