Question

What percentage of water, proteins, lipids and pigments are present in chloroplasts respectively?

• A. 50, 25, 15 and 10
• B. 90, 5, 2 and 3
• C. 95, 2, 1 and 2
• D. 85, 10, 3 and 2

Answer 1

Answer: (B)

90, 5, 2 and 3

The chloroplasts are composed of the carbohydrates, lipids, proteins, chlorophyll, carotenoids (carotene and xanthophylls), DNA, RNA and certain enzymes and co-enzymes. The chloroplasts also contain some metallic atoms as Fe, Cu, Mn and Zn. By chemical analysis, these consist of lipids and proteins basically. Lipids are mainly phospholipid components of the membranes and lamellae. Proteins also contain enzymes, which are fully present in mature plastids. By the chemical analysis, it is observed that chloroplastids contain 90% of water, 5% of proteins, 2% of lipids and 3% of pigments.