NEETZoologyStructural Organisation in Animals
What forms an organ system?
Options
- AA single organ
- BTwo or more organs performing a common function
- CMultiple cells
- DVarious tissues
Correct answer
B. Two or more organs performing a common function
Step-by-step solution
Explanation In the preceding chapters you came across a large variety of organisms, both unicellular and multicellular, of the animal kingdom. In unicellular organisms, all functions like digestion, respiration and reproduction are performed by a single cell. In the complex body of multicellular animals the same basic functions are carried out by different groups of cells in a well organised manner. The body of a simple organism like Hydra is made of different types of cells and the number of cells in each type can