Which one of the following organelles is not found in animal cells?

Option 3 : Cell wall

The correct option is Cell wall.
Concept: 

Cell

• The cell is the basic structure or building block of all living beings. 
• On basis of a number of cells, organisms are divided into unicellular and multicellular organisms. 
• Unicellular organisms can perform all kinds of life processes like respiration, digestion of food, reproduction, and excretion of waste.
• Examples of unicellular organisms include amoeba, bacteria, etc. 
• Cell have certain components called cell organelles which makes cell survive. 
• Some of the cell organelles are vacuole, mitochondria, plastids, etc. 
• Plant cells and animal cells have certain differences according to their need. 
• The difference can be observed in the below diagram.