Which structural feature is typical of a transverse section of a monocotyledonous stem compared to a dicotyledonous stem?

Answer and explanation

Correct answer: D. Vascular bundles scattered, conjoint collateral closed, surrounded by bundle sheaths

  1. Step 1: Monocot stems display an atactostelic arrangement, where numerous vascular bundles are scattered throughout parenchymatous ground tissue.
  2. Step 2: The bundles are conjoint, collateral, and closed (lacking intrafascicular cambium), preventing normal secondary growth.
  3. Step 3: Each bundle is surrounded by a protective sclerenchymatous bundle sheath, and peripheral bundles are smaller and more densely spaced than central bundles.
Answer
Vascular bundles are scattered throughout ground tissue, are conjoint collateral and closed, and each is encircled by a sclerenchymatous bundle sheath
Why not the others: 'Vascular bundles are arranged in a concentric ring...' describes a typical dicotyledonous stem; 'Extensive secondary growth occurs regularly...' is false because monocot stems lack lateral cambia; 'Epidermis is underlain by a collenchymatous hypodermis...' is characteristic of dicot stems (monocot stems have a sclerenchymatous hypodermis).

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