PLANT PHYSIOLOGY
TRANSPORT IN PLANT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Both are plants organ and act as storage
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Sugar sink can be either roots, fruit or mature leaves and sugar source is shoots
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Sugar source act as site for sugar production and sugar sink will store sugar
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Companion tube carry food from a sugar source to a sugar sink
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Detailed explanation-1: -Sugars produced in sources, such as leaves, need to be delivered to growing parts of the plant via the phloem in a process called translocation, or movement of sugar. The points of sugar delivery, such as roots, young shoots, and developing seeds, are called sinks.
Detailed explanation-2: -Source-to-sink transport of sugar is one of the major determinants of plant growth and relies on the efficient and controlled distribution of sucrose (and some other sugars such as raffinose and polyols) across plant organs through the phloem.
Detailed explanation-3: -The accepted mechanism for the translocation of sugars from source to sink is called pressure flow hypothesis. The glucose is prepared at the source by photosynthesis, it is converted to sucrose (a disaccharide).
Detailed explanation-4: -Within the phloem, sugars migrate to regions of low osmotic concentration and low water pressure, called sinks, from areas of high osmotic concentration and high water pressure, known as sources.