explain the structure of dicot and monocot root
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Answer:
Explanation:
Main Difference
The main difference between Dicot Root and Monocot Root is that in dicot root phloem surrounds the xylem tissues that are present in the center of the plant whereas in monocot root xylem and phloem forms circular arrangement.
Structure
Dicot root is narrow and has a tap root-like structure.
Monocot root is comparatively wider and has fibrous root-like structure.
Number of Vascular Tissues
Dicot root has fewer numbers of xylem and phloem, i.e., 2 to 8.
Monocot root has a large number of xylem and phloem, i.e., 8 to many.
Arrangement of Vascular Tissues
In dicot roots, xylem is present in the center and is surrounded by phloem.
In monocot root, xylem and phloem have a ring-like arrangement.
Shape of Xylem
Xylem vessels are angular or polygonal
Xylem vessels are rounded or oval.
Pericycle
In dicot root, pericycle gives rise to cork cambium, lateral roots and parts of the vascular cambium.
In monocot root, pericycle forms lateral roots only.
Pith
Pith is absent in dicot root or very small and undeveloped.
Larger and well-developed pith is present in monocot roots.
Connective Tissues
In dicot roots, there are parenchymatous connective tissues.
Monocot roots have sclerenchymatous connective tissues.
Cambium
Dicot root has cambium which is formed by the conjunctive parenchyma
In monocot roots, cambium is absent.
Xylem
Xylem is usually tetrarch in dicot roots.
Xylem is polyarch in monocot root.
Cortex
Cortex is narrow in dicot roots.
Cortex is very wide in monocot roots.
Covering
In dicot root, older roots are covered by cork
In monocot root, older roots are covered by exodermis
Secondary Growth
Secondary growth occurs in dicot roots.
There is no secondary growth in monocot roots.
Examples
Beans, pea, and peanuts, etc. have dicot roots.
Banana, maize, and palm, etc. are examples of monocot roots.