Question

A group of cells having a common origin and performing similar function is called as
A. Tissue
B. Organ
C. Organ system.
D. Cell aggregate.

Answer 1

Cells are known as the unit of structure. It is the smallest component of the organism which builds the fundamental structure of the body. In nature there are two types of cells available, named prokaryotic cells and eukaryotic cells. Prokaryotic cells are the primitive cells that lack developed organelles and eukaryotic cells involve well-developed complex organelles that are specific for their functions.

Complete answer:
The cluster of cells and their extracellular fluid that originate from a similar origin and responsible for performing a particular function in the association is called tissue. There are two types of tissues that are found in nature. These are plant tissue and animal tissue.
When a cluster of tissues is involved in performing a particular function in the body is called an organ. For example heart, skin, lungs, intestine, kidney, liver, etc.
The biological system that is involved in a group of organs, performing one or more biological activities together is called an organ system. Example: cardiovascular system. The cardiovascular system comprises the heart, veins, arteries, and blood. The heart pumps the blood to the body parts through arteries and receives blood from the lung by the veins. Thus a regulatory system is formed that circulates the blood in the body parts.
Cell aggregate is a condition where some cells form a cluster due to specific reasons. Example: due to rupture in blood vessels, platelets start to associate to repair the place and prevent blood leakage.
So, the correct answer is “Option A”.

Note: AnimalTissues are categorized into four classes. These are nerve tissue, muscle tissue, epithelial tissue, and connective tissue. Plant tissue is also divided into four groups. These are epidermal tissue, vascular tissue, Meristematic tissue, and ground tissue. The tissue is only found in the multicellular organism as a unicellular organism comprises only one cell and very simple biological activities. Thus there is no chance of formation of tissues.