Ncert Exercises & Solutions

Structural organisation in animals attains different levels as cell-organ-organ system. What is missing in this chain? Mention the significance of such an organisation.

Tissue is the missing in the chain. Structural organisation can be shown as cell-tissue-organ-organ system.

Number of cells together form tissue, number of tissue together form organ which on when unit with several organ form organ-system.

In organisms like Hydra, the body is comprised of thousands of cells in which each cell works independently whereas in a complex body system as that in humans billions of cells perform various functions together via connecting each other through connecting tissue.

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