Differentiate between organs and organelles.
A group of tiisues which have common origin and perform similar function make up an organ. Organ is the collection of tissues performing similar function. Organ is large and forms a part of the body. Organs together form organ systems.
Organelle is a small structure which lies inside the cell and performs certain functions of the cell. Organelles are microscopic and lie inside the cell. Organelles collectively form a cell.