Answer: Diadelphous (nine plus one).
- A Monadelphous (one bundle)
- B Syngenesious by anthers
- C Diadelphous (nine plus one)
- D Polyandrous and all free
Correct answer: C. Diadelphous (nine plus one)
Explanation: The pea family shows diadelphous stamens - nine fused into a tube and one standing free.
In a dicot stem, vascular bundles are arranged in a single ring (with cambium between xylem and phloem, enabling secondary growth); in a monocot stem, bundles are scattered throughout with no cambium, so monocots can't undergo secondary growth (no wood formation).
Concept context
External structure of roots, stems, and leaves plus internal tissue organization. High marks in Class 11 and NEET.