Ribosomes are granular structures first observed under the electron microscope by George Palade. In a typical plant cell, these non-membrane bound organelles are located in/on:

Step-by-step solution

Ribosomes are non-membrane bound organelles found in all living cells. In a typical plant cell, they are found free in the cytoplasm, attached to the outer surface of the rough endoplasmic reticulum, and inside semi-autonomous organelles such as mitochondria and chloroplasts. Smooth endoplasmic reticulum, Golgi apparatus, vacuoles, and lysosomes do not contain ribosomes. Answer: Cytoplasm, rough endoplasmic reticulum, mitochondria and chloroplasts