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Tissues — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceTissues5 Marks
Question
Describe components of phloem. Define translocation.
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Answer

Phloem is made up of four types of elements: Sieve tubes, companion cells, phloem fibres and the phloem parenchyma.
  1. Sieve tubes: These are tubular cells with perforated walls. These cells are responsible for transportation of food and nutrients.
  2. Companion cells: These cells are found associated with sieve tubes and connected with it by simple pits. These cells are long, narrow and thin walled. These cells are living.
  3. Phloem fibres: They have thick cell wall and they provide mechanical support to plant.
  4. Pholem parenchyma: These cells are living and often cylindrical in shape.

The transport of food from leaves to other parts of the plant is called translocation

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