HORTICULTURE

Detailed explanation-1: -A group of tissues performing a particular function in the body forms an organ. A group of organs that work together to maintain a stable internal environment and perform a particular function is called as organ system. Thus, the correct answer is ‘Organ. ‘

Detailed explanation-2: -Organ-a group of tissues precisely arranged so that they can work together to perform specific functions.

Detailed explanation-3: -Tissues come together to form organs. For example, lungs, trachea, etc. Several organs in the body come together to perform a common body function and it is known as organ system.

Detailed explanation-4: -The parenchyma is the functional parts of an organ, or of a structure such as a tumour in the body. This is in contrast to the stroma, which refers to the structural tissue of organs or of structures, namely, the connective tissues.