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An old piece of dicot stem and a dicot r...

An old piece of dicot stem and a dicot root is given to a candidate during practical examination . Which of the following anatomical structures can be used to distinguish between the two ?

A

Secondary xylem

B

Secondary phloem

C

Protoxylem

D

Cortical cells

Text Solution

AI Generated Solution

The correct Answer is:
To distinguish between an old piece of dicot stem and a dicot root, we can analyze their anatomical structures. Here’s the step-by-step solution: ### Step 1: Identify the Structures - We need to focus on the anatomical structures present in both the dicot stem and dicot root. The options provided are secondary xylem, secondary phloem, proto xylem, and cortical cells. ### Step 2: Examine the Proto Xylem - The proto xylem is the first xylem to develop and can be used as a distinguishing feature. In dicot stems, the proto xylem is located towards the center of the stem, while in dicot roots, it is found towards the periphery. ### Step 3: Analyze the Meta Xylem - The meta xylem, which develops after proto xylem, is located differently in both structures. In dicot stems, the meta xylem is positioned towards the periphery, whereas in dicot roots, it is situated towards the center. ### Step 4: Determine the Type of Xylem - The arrangement of xylem in dicot stems is termed "endarch," meaning the proto xylem is located inward, and the meta xylem is outward. In contrast, the arrangement in dicot roots is termed "exarch," where the proto xylem is outward, and the meta xylem is inward. ### Conclusion - Based on the differences in the position of proto xylem and meta xylem, the anatomical structure that can be used to distinguish between a dicot stem and a dicot root is the **proto xylem**. ### Answer - The correct option is **proto xylem**. ---
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