An organelle is a subcellular entity present in a cell that is responsible for performing one or more specified jobs. It works in the cell exactly the same way an organ works in a body. These subcellular entities are also termed as vesicles. All the activities of a cell are divided among these organelles. This is why it is said that there is a division of labor in a cell. These organelles are bounded by a membrane that separates the product of one organelle from the other.
The mitochondrion, chloroplast, nucleus, endoplasmic reticulum etc. all are the examples of organelles. The mitochondrion is responsible for cellular respiration and is termed as a powerhouse of the cell. The chloroplast carries out the process of photosynthesis. The nucleus contains the genetic material.
