In terms of organisms, photosynthesis occurs in autotrophes that contain the green pigment chlorophyll. This would include the entire plant kingdom, half of the Protista (the algae), & half the Moneran Kingdom (the blue-green algae).
A standard twin mattress is 39 by 75 inches. A king is 76 by 80 inches. This means that a headboard for a king bed is going to be about 76 inches or wider, plenty wide enough to go along the length of a twin bed. Headboards are often slightly wider than the bed for which they are made.
Queen-size beds are 60 inches by 80 inches long. A queen headboard is typically 63 inches wide, but it varies depending on style. Given the close widths, many comforters are made to fit full/queen-size beds. A full/queen comforter is slightly shorter on the queen bed.