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After preparing a transverse section out...

After preparing a transverse section out of a cut piece of a plant axis, it was seen that it has a C shaped open arch of endarch collateral vascular bundles with secondary growth. This indicates that it is a transverse section of

A

A dicotyledonous petiole

B

A dicot stem at the node

C

A dicot root at the point where a root branch is coming out

D

A phylloclade

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The correct Answer is:
To solve the question regarding the transverse section of a plant axis with specific characteristics, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Characteristics of the Vascular Bundles**: - The question states that the vascular bundles are "endarch" and "collateral". Endarch vascular bundles are characterized by the xylem being located towards the center of the stem and the phloem towards the outside. Collateral means that the xylem and phloem are located next to each other. 2. **Determine the Type of Vascular Bundles**: - The vascular bundles are described as "open". Open vascular bundles contain a cambium layer, which is responsible for secondary growth. This indicates that the plant is likely a dicot, as dicots typically have open vascular bundles. 3. **Consider Secondary Growth**: - The presence of secondary growth is a key factor. Secondary growth is common in stems of dicots, allowing them to increase in thickness. This growth is not typically found in roots or petioles. 4. **Evaluate the Options**: - **Dicot Petiole**: Petioles do not exhibit secondary growth, so this option is incorrect. - **Dicot Stem**: Dicot stems do exhibit secondary growth and have the characteristics described (endarch, collateral, open vascular bundles). This option is likely correct. - **Dicot Root**: Dicot roots do not typically show secondary growth in the same way stems do, so this option is incorrect. - **Phyloclade**: A phyloclade is a stem modification that does not typically exhibit secondary growth. Therefore, this option is also incorrect. 5. **Conclusion**: - Based on the analysis of the characteristics and the evaluation of the options, the correct answer is that the transverse section is of a **dicot stem**. ### Final Answer: The transverse section is of a **dicot stem**. ---
To solve the question regarding the transverse section of a plant axis with specific characteristics, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Characteristics of the Vascular Bundles**: - The question states that the vascular bundles are "endarch" and "collateral". Endarch vascular bundles are characterized by the xylem being located towards the center of the stem and the phloem towards the outside. Collateral means that the xylem and phloem are located next to each other. 2. **Determine the Type of Vascular Bundles**: ...
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