alleryStart learning →In phloem transport, which structures are correctly described as sinks?
AMature leaves at the top of the canopy
BRoots, young shoots and developing seeds
CPhotosynthesising cells of the leaf mesophyll
DStomatal guard cells of the lower epidermis
Answer & Solution
Correct answer: B. Roots, young shoots and developing seeds
1. Structures that produce photosynthates for the growing plant are sources, and leaves are the obvious example.
2. The points of sugar delivery are sinks, and roots, young shoots and developing seeds are the examples given.
3. Delivery of sugars from source to sink through the phloem is called translocation.
4. Seeds, tubers and bulbs can be either a source or a sink depending on the season and the stage of development.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.5 Transport of Water and Solutes in Plants_
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