PLANTS
TRANSPORT IN PLANTS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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that sink strength drives transport in the pholem
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that transport in treachery elements is pressure dependent
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the water potential gradient in the sieve elements drives transport
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the pressure gradient between the sieve elements at the source and the sink drives phloem transport
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Detailed explanation-1: -In Plants, the mechanism explained for the translocation of sugars from source to sink is referred to as the pressure-flow hypothesis. Glucose generated by photosynthesis at the source is converted to sucrose which is moved to the phloem sieve tube cells through the companion cell by active transport.
Detailed explanation-2: -Phloem movement occurs by mass flow from sources of sugar to sugar sinks. The phloem movement is bidirectional but unidirectional in xylem cells.
Detailed explanation-3: -A model, called the pressure flow model, describes how sucrose concentrations determine the direction of the flow. Two types of cells-source cells and sink cells-play roles in the transport of solutions in the phloem. Source cells produce sucrose and load it into the phloem.
Detailed explanation-4: -Answer. Translocation is the process by which assimilates from photosynthesis are moved around the plant, from where they are made to where they are needed. The place where these assimilates are produced is called the source, and the place they are moved to is called the sink.