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Transport in Plants — BIO BOTANY STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11BIO BOTANYTransport in Plants3 Marks
Question
What is meant by phloem unloading?
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Answer

From sieve elements sucrose is translocated into sink organs such as roots, tubers, flowers and fruits and this process is termed as phloem unloading. It consists of three steps:
  1. Sieve element unloading: Sucrose leave from sieve elements.
  2. Short distance transport: Movement of sucrose to sink cells.
  3. Storage and metabolism: The final step when sugars are stored or metabolized in sink cells.

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