73. The tounslocation of organic solutes through phloem is bidirectional because
a root ucts us Source und leaf acts as sink b. source and sink arc incversed in any seuson
e translocation is an ATP repulated process
d. Source sink relationship is variable depending upon season or needs of plant
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The photosynthetic part acts as the source and the part in which the food is stored acts as the sink.
The contents of the phloem flow from the sources to the sinks.
But when the leaves shed the sugar stored in roots mobilize the organic material towards the growing buds.
Hence, the direction of the source and sink is reversed and the flow of food is bidirectional in the phloem.
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