Question

give an example of plant structure that can be either a sugar source or a sink. be certain to indicate under what conditions the structure is one or the other.

Answer 1

Functionally a plant can be divided into source and sink.

• sources being the parts where net fixation of carbon dioxide occurs.
• sinks being the sites where assimilates are stored or used.
• Allocation of assimilates between plant parts occurs via transport in the phloem.
• sugars are transported through the plant via the phloem in a process called translocation.
• The points of sugar delivery, such as roots, young shoots, and developing seeds, are called sinks.
• Seeds, tubers, and bulbs can be either a source or a sink, depending on the plant's stage of development and the season.

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