The group of cells that perform a particular function are called as(a)Tissue(b)Organ(c)Organ system (d) Molecule

The correct answer is:

(a) Tissue

Explanation:
In biological terms, a tissue is a group of similar cells that work together to perform a specific function. Tissues make up various parts of organisms and play essential roles in the body's structure and function. For example, muscle tissue consists of cells that contract to allow movement, while nervous tissue contains cells that transmit signals throughout the body.

Let's look at why the other options are incorrect:

(b) Organ: An organ is made up of multiple tissues that work together to perform a specific function, like the heart or liver.
(c) Organ system: An organ system is a higher level of organization that involves multiple organs working together, such as the digestive or respiratory system.
(d) Molecule: A molecule is a group of atoms bonded together and does not consist of cells. Molecules form the chemical basis for cellular functions.
So, tissue is the correct term for a group of cells performing a particular function.