Question

what will happen if cells are not properly organised in tissue.

Answer 1

All the different cells of your body usually live, grow and divide in harmony. For example, you always have just the right number of liver cells and white blood cells. Your body has many different signals that control how much, and how often your cells divide. If any of these signals are faulty or missing, the result can be cancer, where too many cells are produced.

Answer 2

Every organism, unicellular or multi cellular need to perform  lots of functions like respiration, digestion, locomotion in order to survive.  Some tissues help in growth, some in locomotion, some in body movement. So if tissues are not present in bodies of living organism then these kind of highly organised and specialized process will become disorganized, and so there will be no co-ordination in the functioning of cells and body.