Question:
Arrange the following in a centrifugal manner in Primary Dicot Stem:
\[
\text{I. Pericycle}
\]
\[
\text{II. Cambium}
\]
\[
\text{III. Metaxylem}
\]
\[
\text{IV. Starch Sheath}
\]
Arrange the following in a centrifugal manner in Primary Dicot Stem:
\[ \text{I. Pericycle} \] \[ \text{II. Cambium} \] \[ \text{III. Metaxylem} \] \[ \text{IV. Starch Sheath} \]
\[ \text{I. Pericycle} \] \[ \text{II. Cambium} \] \[ \text{III. Metaxylem} \] \[ \text{IV. Starch Sheath} \]
Show Hint
Centrifugal means from centre to outside. In dicot stem anatomy, starch sheath is outside the pericycle, while cambium lies between xylem and phloem.
Updated On: Jun 19, 2026
- IV, I, II, III
- IV, II, I, III
- III, II, I, IV
- III, I, II, IV
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understand centrifugal arrangement.
Centrifugal arrangement means arrangement from the centre toward the outer side.
So, we have to arrange the given structures from inner region to outer region in a primary dicot stem.
Step 2: Recall anatomy of primary dicot stem.
In a primary dicot stem, vascular bundles are arranged in a ring.
Inside each vascular bundle, xylem lies toward the inner side.
Phloem lies toward the outer side.
Cambium is present between xylem and phloem.
Step 3: Position of metaxylem.
In stem, xylem is endarch.
In endarch xylem, protoxylem lies toward the centre and metaxylem lies comparatively toward the outer side of xylem.
Among the given structures, metaxylem is the innermost relevant structure.
So, metaxylem comes first.
Step 4: Position of cambium and pericycle.
Cambium is present between xylem and phloem.
It lies outside the xylem region and inside the outer ground tissue region.
Pericycle is present outside the vascular bundles and inside the endodermis or starch sheath.
So, after metaxylem and cambium, pericycle comes next.
Step 5: Position of starch sheath.
The endodermis of dicot stem is called starch sheath because its cells store starch.
It is situated outside the pericycle.
Therefore, starch sheath is the outermost among the given structures.
Step 6: Final arrangement.
Thus, the centrifugal order is: \[ \text{Metaxylem} \rightarrow \text{Cambium} \rightarrow \text{Pericycle} \rightarrow \text{Starch Sheath} \] So, \[ \text{III, II, I, IV} \]
Step 7: Final conclusion.
Hence, the correct answer is \[ \boxed{\text{III, II, I, IV}} \]
Centrifugal arrangement means arrangement from the centre toward the outer side.
So, we have to arrange the given structures from inner region to outer region in a primary dicot stem.
Step 2: Recall anatomy of primary dicot stem.
In a primary dicot stem, vascular bundles are arranged in a ring.
Inside each vascular bundle, xylem lies toward the inner side.
Phloem lies toward the outer side.
Cambium is present between xylem and phloem.
Step 3: Position of metaxylem.
In stem, xylem is endarch.
In endarch xylem, protoxylem lies toward the centre and metaxylem lies comparatively toward the outer side of xylem.
Among the given structures, metaxylem is the innermost relevant structure.
So, metaxylem comes first.
Step 4: Position of cambium and pericycle.
Cambium is present between xylem and phloem.
It lies outside the xylem region and inside the outer ground tissue region.
Pericycle is present outside the vascular bundles and inside the endodermis or starch sheath.
So, after metaxylem and cambium, pericycle comes next.
Step 5: Position of starch sheath.
The endodermis of dicot stem is called starch sheath because its cells store starch.
It is situated outside the pericycle.
Therefore, starch sheath is the outermost among the given structures.
Step 6: Final arrangement.
Thus, the centrifugal order is: \[ \text{Metaxylem} \rightarrow \text{Cambium} \rightarrow \text{Pericycle} \rightarrow \text{Starch Sheath} \] So, \[ \text{III, II, I, IV} \]
Step 7: Final conclusion.
Hence, the correct answer is \[ \boxed{\text{III, II, I, IV}} \]
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