The Correct Answer and Explanation is:
The correct answer is S.
The clue “Porous water-absorbing mass of fibers” most accurately describes a sponge. This object is the quintessential example that fits every part of the description, making ‘S’ the strongest possible answer among the choices.
A sponge is defined by its highly porous structure. This network of interconnected voids and channels allows it to hold a significant volume of water relative to its own mass. The term “porous” is central to the identity of a sponge. This physical characteristic directly enables its primary function, which is to be “water absorbing.” The absorption occurs through a process known as capillary action, where water is drawn into the tiny spaces within the sponge’s material, adhering to the internal surfaces.
The final part of the clue, “mass of fibers,” also applies perfectly. Natural sea sponges are the fibrous skeletons of simple marine animals. Their entire structure consists of a mesh of flexible, proteinaceous fibers. Similarly, synthetic sponges, which are common household items, are manufactured from materials like cellulose fibers or plastic polymers. These materials are processed to create a foamy, interconnected structure that mimics the fibrous and porous nature of their natural counterparts.
While other words could potentially fit the description, such as a towel (T) or a rag (R), the term sponge is the most precise and fundamental answer. A towel is defined more by its use as a piece of absorbent cloth for drying, and a rag is typically a scrap of old fabric. A sponge, however, is defined specifically by the physical properties listed in the clue. Its name is synonymous with being a porous, absorbent, and often fibrous mass. Therefore, “sponge” is the most direct and fitting answer.
