Study Guides/Biology/Difference Between Monocot and Dicot Root
Study Guide ┬╖ Biology

Difference Between Monocot and Dicot Root Anatomy

When you slice a plant root horizontally and look at its internal tissue arrangement under a microscope, you can instantly identify whether the plant is a Monocot (like grass or wheat) or a Dicot (like a mango tree or sunflower).

Question (Click to Flip)

What is the difference in their root systems outside the soil?

Answer

Physically, dicots have a primary 'Tap Root' system (one main deep root with smaller side branches, like a carrot). Monocots have a 'Fibrous Root' system (a shallow, bushy network of thin roots, like grass).

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Key Facts

In both types of roots, the outermost layer (the Epiblema) produces the tiny, unicellular root hairs that absorb water from the soil.

The Endodermis (inner boundary layer) in dicot roots has distinct waterproof bands called 'Casparian strips'.

1. The Pith (Center of the Root)

  • Monocot Root: The central core (Pith) is very large, prominent, and highly developed. It is made of parenchymatous cells.
  • Dicot Root: The pith is either completely absent, or it is extremely small and inconspicuous at the very center.

2. Vascular Bundles (Xylem and Phloem)

  • Monocot Root: They have a large number of vascular bundles arranged in a ring. This condition is called Polyarch (usually having more than 6 xylem bundles).
  • Dicot Root: They have very few vascular bundles. The number of xylem bundles is usually between two to six. This condition is called Diarch to Hexarch.

3. Shape of the Xylem

  • Monocot Root: The primary xylem vessels are oval or rounded in shape.
  • Dicot Root: The primary xylem vessels often form a distinct star-like or cross-like shape in the center of the root.

4. Secondary Growth

  • Monocot Root: Roots of monocot plants do not have cambium tissue. Therefore, they do not undergo secondary growth (they do not turn into thick, woody roots).
  • Dicot Root: Vascular cambium develops later in life. Therefore, dicot roots undergo extensive secondary growth, allowing the tree's roots to become massive and woody to support the heavy trunk.

Questions and Answers

What is the difference in their root systems outside the soil?+

Physically, dicots have a primary 'Tap Root' system (one main deep root with smaller side branches, like a carrot). Monocots have a 'Fibrous Root' system (a shallow, bushy network of thin roots, like grass).

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