The carbohydrates synthesized in the leaves are transported through sieve tubes most commonly in the form of
A
Glucose
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B
Starch
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C
Sucrose
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D
Cellulose
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Solution
The correct option is D Sucrose Plants produce carbohydrates (sugars) in their leaves by photosynthesis, but nonphotosynthetic parts of the plant also require carbohydrates and other organic and nonorganic materials. For this reason, nutrients are translocated from sources (regions of excess carbohydrates, primarily mature leaves) to sinks (regions where the carbohydrate is needed). Some important sinks are roots, flowers, fruits, stems, and developing leaves. Leaves are particularly interesting in this regard because they are sinks when they are young and become sources later when they are about half grown. All plants translocate sucrose (table sugar) and some also transport other sugars such as stachyose, or sugar alcohols such as sorbitol. Many other organic compounds are found, including amino acid proteins and hormones. Glucose, the sugar found in the circulatory system of animals, is not translocated.