Question

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. Dicot stem at the node
• C. Dicot root at the point where a root branch is coming out
• D. Phylloclade

Answer 1

The correct option is A Dicotyledonous petiole

According to the question, C shaped open arch of endarch, collateral vascular bundles are seen in the transverse section. A dicot stem is characterized by the presence of collateral, endarch, open vascular bundles arranged in a complete ring and thus, does not have C shaped vascular bundles. But a dicot petiole is marked by the presence of collateral endarch vascular bundles, arranged in a semi-cylinder in the centre of the petiole, thus making a C-shaped appearance.

Thus, the correct answer is option A.