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The tissue composed of the living, thin-walled, polyhedral cell is
A. Parenchyma
B. Collenchyma
C. Sclerenchyma
D. Xylem

Answer
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Hint:The tissue is defined as a group of similar or dissimilar cells that have the same origin and perform a common function. The plant tissues are characterized into two types namely Meristematic tissue and Permanent tissue.

Complete answer:The tissue is a group of cells that may or may not be of a similar type but they always have a common origin and function. The study of tissues is known as Histology.
Parenchyma –
It is a simple permanent tissue. This means that it is made up of similar kinds of cells. The parenchyma is a living tissue. It has a very thin cell wall made up of cellulose and hemicellulose. The cells have a variety of shapes that range from rounded cells to polyhedral cells. The parenchyma tissue is responsible for the storage of the food.
Collenchyma –
It is a simple permanent tissue. This means that it is made up of similar kinds of cells. The collenchyma is a living mechanical tissue. This is because it provides mechanical strength and support to the plant. The cell wall is pectinated due to which it is thick. The cells are polyhedral ranging from rectangular to hexagonal.
Sclerenchyma –
It is a simple permanent tissue. This means that it is made up of similar kinds of cells. It is the dead mechanical tissue. It is also the chief mechanical tissue. The cell wall in sclerenchymatous cells is thick due to the deposition of the lignin. The cells have different types of shapes.
Xylem –
It is a complex permanent tissue. This means that it is made up of dissimilar kinds of cells. The xylem is the water-conducting tissue. It is mainly of two types, the Primary xylem, and the Secondary xylem.
Thus, based on the above information we can conclude that the tissue composed of the living, thin-walled, polyhedral cell is Parenchyma.

Hence, the correct answer is an option (A).

Note: The parenchyma has several modifications in a plant. For example, when the chloroplast is present in the parenchymatous cells then it is known as chlorenchyma. When large air chambers are present in the parenchyma then it is known as the aerenchyma. Sometimes the parenchyma also contains the oil glands, resin glands, and lactiferous glands.