A meal consists of grilled trout, potatoes and mushrooms. Explain how each item is ultimately the product of photosynthesis.

Trout eat aquatic insects, many of which eat microscopic algae (phytoplankton) which make their food by photosynthesis. Potatoes are stem tubers having food which the potato plant made in its leaves (by photosynthesis). Mushrooms feed on decaying organic matter which comes from (i) dead plants which had made their food by photosynthesis or (ii) remains or faces of animals which fed on plants, or on animals which ate plants which photosynthesised