carbohydrates are made of sugars & photosynthesis means producers / green plants convert from carbon dioxide and water and solar energy into carbohydrates and food and oxygen for themselves ->  photosynthesis means green plants convert carbon dioxide and water and solar energy into sugars and food and oxygen  photosynthesis means green plants convert carbon dioxide and water and solar energy into sugars and food and oxygen & if a process converts something into something else then that process is a source of that something else ->  photosynthesis is a source of sugars  photosynthesis is a source of sugars & a leaf performs photosynthesis / gas exchange ->  a leaf is a source of sugars  a leaf is a source of sugars & things usually travel from a source of that thing to other areas ->  sugars travel from leaves to other areas  sugars travel from leaves to other areas & special tissues in plants transport food / water / minerals throughout the plant ->  sugars are transported from leaves to other parts of a plant  sugars are transported from leaves to other parts of a plant & roots are a part of a plant / tree ->  sugars are transported from the leaves to the roots of a plant  a needle is a part of a pine tree & a needle is a kind of leaf ->  a needle is a kind of leaf that is a part of a pine tree  sugars are transported from the leaves to the roots of a plant & a needle is a kind of leaf that is a part of a pine tree -> sugars are transported from the needles to the roots of a pine tree