Question

Pith and cortex do not differentiate in

• A. monocot stem
• B. dicot stem
• C. monocot root
• D. dicot root.

Answer 1

The Correct Option is A

To determine in which of the given options the pith and cortex do not differentiate, let's explore the structure of stems and roots in monocots and dicots:

• Monocot Stem: In monocot stems, the vascular bundles are scattered throughout the ground tissue, and there is no distinct separation between pith and cortex. This is because monocot stems do not have a defined central axis, which is a feature in dicot stems.
• Dicot Stem: In dicot stems, the vascular bundles are arranged in a ring, allowing for clear differentiation between the pith (central region) and the cortex (outer region).
• Monocot Root: Monocot roots typically show a different arrangement where the vascular bundles are surrounded by a distinct endodermis, allowing some differentiation of pith and cortex.
• Dicot Root: In dicot roots, the vascular bundles are also arranged in a way that allows pith and cortex differentiation.

From the above observations, we can conclude that:

• The correct\ answer is the monocot stem because it lacks a clear distinction between pith and cortex due to the scattered arrangement of vascular bundles.
• The other options (dicot stem, monocot root, and dicot root) all have arrangements of vascular bundles that allow for the differentiation of pith and cortex.

Therefore, the correct answer is monocot stem.