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MODEL PAPER 3 — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYMODEL PAPER 31 Mark
MCQ
Tyloses are balloon-like ingrowths in vessels developing from:
  • A
    Fibres through the general surface of the vessel wall
  • B
    Fibre through pits on vessels wall
  • C
    Parenchyma through the general surface of the vessel wall
  • D
    Parenchyma through the pits of vessels wall
✓

Answer

(d) Parenchyma through the pits of vessels wall
Explanation: Tyloses are balloon-like ingrowths in vessels developing from parenchyma cells through the pits of the vessel wall of the xylem of secondary heartwood.

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