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NEET2010BotanyAnatomy of Flowering PlantsActual

Heartwood differs from sapwood in

Options

  1. Apresence of rays and fibres
  2. Babsence of vessels and parenchyma
  3. Chaving dead and non-conducting elements
  4. Dbeing susceptible to pests and pathogens

Correct answer

C. having dead and non-conducting elements

Step-by-step solution

As a result of continued secondary growth in subsequent years, the older part of secondary xylem or wood becomes non-functional as it loses the power of conduction. The cells of this wood are filled with resins or tannins produced by adjacent functional cells. The activities of vessels become blocked by tyloses. Due to these activities, non-functional, secondary xylem becomes hard, durable and blackish in colour, called heart-wood. Now, the function of secondary xylem (water and mineral conduction from roots) is pe

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