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STD 11 - 6. Anatomy flowering plants — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 6. Anatomy flowering plants1 Mark
MCQ
The chief function of sieve tubes is
  • ✓
    To translocate the organic materials manufactured in the leaves
  • B
    To conduct minerals
  • C
    To transport water from root to leaves
  • D
    To help the plant in forming wood
✓

Answer

Correct option: A.
To translocate the organic materials manufactured in the leaves
a
(a)The sieve tubes are syncytes and allow free diffusion of soluble organic substances. The callose also plays important role.

Usually the perforations in the sieve plates are surrounded by callose. The callose is soluble and disappears when the solute is dilute so that the solute can pass from one cell to another cell through the pores.

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