The plant tissue with the following characteristics is :

– Oval/round-shaped cells

– Cells have a living protoplasm and are dense

– Cell wall is made of cellulose or hemicellulose

– Thin-walled cells

The correct option is Parenchyma.

Let us break down the characteristics of parenchyma tissue to understand why it matches the description:
1. Cell Shape: Parenchyma cells are typically simple, relatively unspecialized, and generally oval, round, polygonal, or elongated in shape.
2. Living Protoplasm: Unlike sclerenchyma, which consists of dead cells at maturity, parenchyma cells are living cells possessing a functional nucleus and a dense cytoplasm (protoplasm).
3. Cell Wall Composition: The cell walls of parenchyma cells are thin and made up of cellulose, hemicellulose, and pectin.
4. Thin Cell Walls: Parenchyma cells have primary, uniformly thin cell walls, which allows them to remain flexible and carry out metabolic functions like photosynthesis, storage, and secretion.

In contrast:
- Collenchyma has cells with localized thickening at the corners due to deposition of cellulose, hemicellulose, and pectin.
- Sclerenchyma consists of dead cells with highly thickened, lignified cell walls.
- Epidermis is a protective outer layer whose cells can vary, and it typically serves a protective function rather than general metabolic storage.