Step 1: Understanding the Question:
Plastids are double-membrane organelles found in plant cells and are classified based on their pigment content and function.
Step 2: Detailed Explanation:
Chromoplasts are plastids that contain high concentrations of carotenoid pigments (carotenes and xanthophylls) rather than chlorophyll.
They are responsible for the bright red, orange, and yellow colors of fruits, flowers, and autumn leaves.
Leucoplasts (A) are colorless plastids involved in storage (e.g., amyloplasts store starch).
Amyloplasts (C) are a type of leucoplast that store starch.
Chloroplasts (D) contain chlorophyll and are the sites of photosynthesis.
Thus, the correct answer is chromoplasts.
Step 3: Final Answer:
Thus, plastids with high carotenoid concentrations are chromoplasts, which corresponds to option (B).
[0.5cm]