Correct Option
The correct option is (a).
Explanation
Plastids are double-membrane organelles found in plant cells and euglenoids. Based on the presence or absence of specific pigments, plastids are classified into three main types: Chloroplasts (containing chlorophyll), Chromoplasts (containing fat-soluble carotenoid pigments), and Leucoplasts (colorless plastids).
Statement-wise Analysis
- Statement 1 is Correct: Leucoplasts are primarily organelles responsible for the storage of nutrients. Based on the material stored, they are further categorized into Amyloplasts (store carbohydrates like starch), Elaioplasts (store oils and fats), and Aleuroplasts (store proteins).
- Statement 2 is Incorrect: Leucoplasts do not contain photosynthetic pigments. Chlorophyll is specifically found in Chloroplasts, which are responsible for trapping light energy for photosynthesis.
- Statement 3 is Incorrect: Leucoplasts are colorless plastids because they lack pigments. The green color in plant parts is due to Chloroplasts, which contain chlorophyll and carotenoids.
Key Takeaway
Leucoplasts are colorless plastids specialized for nutrient storage (starch, oils, proteins), distinct from Chloroplasts (green, photosynthetic) and Chromoplasts (colored, non-photosynthetic).