Question

What is the difference between:
(a) Cell & Tissue
(b) Organ & Organism
(c) Organ & Organelle
(d) Organ & Organ System

Answer 1

(a) Cell	Tissue
A cell is the structural and functional unit of all living beings.	A tissue is a group of similar cells which perform a specific function.
E.g. epithelial cell	E.g. nervous tissue
(b) Organ	Organism
Several tissues together contribute to specific functions inside the body and constitute an organ.	Several organ systems together constitute the organism.
E.g. stomach	E.g. human being
(c) Organ	Organelle
Several tissues together contribute to specific functions inside the body and constitute an organ.	Parts of the cell that have a definite function in the cell.
E.g. stomach	E.g. mitochondria
(d) Organ	Organ system
Several tissues together contribute to specific functions inside the body and constitute an organ.	Many organs act together to perform a specific life process and constitute an organ system.
E.g. stomach	E.g. digestive system