Question

Difference between phloem loading and phloem unloading (3 points)​

Answer 1

Answer:This transfer of sugars (photosynthetic) from mesophyll cells to sieve tube elements in the leaf is called as phloem loading. On the other hand, the transfer of sugars (photosynthetic) from sieve tube elements to the receiver cells of consumption end (i.e., sink organs) is called as phloem unloading.

Explanation:

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Answer 2

Answer:

Difference between phloem loading and phloem unloading will be explained in the explanation part.

Explanation:

Difference between phloem loading and phloem unloading:

• During phloem loading, the photoassimilates (such as sucrose) from the mesophyll cells are transported into the sieve elements. But during phloem unloading, the substances are transfer from sieve elements into the target cells.
• In symplastic phloem loading, photoassimilates are translocated into the sieve tubes through specialized companion cells, called intermediary cells, by a large number of plasmodesmsata. Whereas in symplastic phloem unloading, the phloem sap reach the cells of the sink organs from the sieve tube element-companion cell complex via plasmodesmata.
• In apoplastic phloem loading, photoassimilates are first transported from the mesophyll cells via bundle sheath cells to the extracellular apoplastic region and then by active transport into the specialized companion cells, called transfer cells. But in apoplastic phloem unloading, the substances are first transported from the sieve tube element-companion cell complex to the extracellular apoplastic region and then are taken up into the cells of the sink organs.