The ribosomes of the chloroplasts are smaller (70) S than the cytoplasmic ribosomes (80)S .
what is meant by this.pls explain it.
Chloroplast ribosomes are similar to those found in prokaryotes i.e., of 70S type. Eukaryotic ribosomes which are found in cytoplasm are of 80S type. S stands for Svedberg unit, and is indicative of density and size. Thus, ribosomes found in chloroplast are smaller than those found in the cytoplasm. Ribosomes found in chloroplast are made up of two subunits: 50S and 30 S = 70S. Ribosomes found in cytoplasm of eukaryotes are made up of two subunits: 60S and 40 S = 80S.