Question

Tissues do only a:
a. Particular function b. Multiple functions c. Both d. None

Answer 1

Answer:

Tissues do only a particular function.

Explanation:

Level of structural organisation in the Living World

Each and every organism on this planet is made up of cells, which are defined as the structural and functional unit of life.
The organisms are divided into four distinct categories based on their structural organisation. These are:

1. Cellular level: The individual cells perform different tasks and there is no correlation between the activities of the different cells between each other. E.g., unicellular organisms and members of lower phylum like Porifera (Porifera members are multicellular but the cell performs different functions due to the absence of cellular junctions).
2. Tissue level: The tissues are a group of cells which combine together to perform a similar function. A noteworthy point is that the properties of tissues or the functions of the tissues are a result of their interactions among the constituent cells and not a sole property of the tissue.
3. Organ level: When some of the tissues combine/group together to serve a common function such as digestion, respiration/gaseous exchange as in lungs, metabolism as in the liver, etc., then the said group of tissues is termed as an 'organ'. E.g., the stomach, the lungs, etc.
4. Organ-system level: When two or more organs combine/group together to serve a common function like digestion, breathing, circulation of body fluids, etc, then the whole group of organs contributing to this common cause is known as the 'system of organs' or simply 'organ system'. E.g., the digestive system comprises of mouth, salivary glands, oesophagus, stomach, intestines, rectum, and also accessory glands like salivary glands, liver, and, pancreas.

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