Live sponges typically take on a hollow cylendar shape, and yes, the do have water inside while living. They take water in through the pores in their skin, filtering out food as it is channeled into their central empty chamber, called the spongocoel. They collect food in cells called choanocytes, and move water using flagellum, similar to the structure that moves human sperm. Then the water is pushed out of a hole in the top of the sponge called the osculum.
The above answer is correct, however there seems to be a mistake in the question. It is in the wrong category, as sponges are animals, not plants. They do not photosynthesize, but rather filter out food particles, bacteria, and small crustaceans from the surrounding water by passing it through them. It is the jellylike mesohyl between the two layers of tissue that compose these animals that gives them the spongy properties, although it is soft enough for human use in only a few species. The rest have their mesohyl layer (made up of collagen and collagen fibers) reinforced to act as a more rigid endoskeleton.
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