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NEET2016BotanyAnatomy of Flowering PlantsActual

The balloon-shaped structures called tyloses

Options

  1. AOriginate in the lumen of vessels
  2. BCharacterize the sapwood
  3. CAre extensions of xylem parenchyma cells into vessels
  4. DAre linked to the ascent of sap through xylem vessels

Correct answer

C. Are extensions of xylem parenchyma cells into vessels

Step-by-step solution

Tyloses are balloon-shaped structures in xylem vessels developed by xylem parenchyma cells. Malpighi (1686) for the first time reported the ‘balloon-shaped sacs’ in the lumen of vessels of heartwood and he named it as tyloses based on the Greek word ‘Thyllen’ meaning ‘bag’ or ‘container’. Tyloses development occurs through the pit-pairs connecting parenchyma and tracheids or vessels. Sometimes many tyloses originate from a single parenchymatous cell. The tyloses compl

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