Answer: Phyllotaxy.
- A Phyllotaxy
- B Venation
- C Aestivation
- D Vernation
Correct answer: A. Phyllotaxy
Explanation: Phyllotaxy refers to the arrangement of leaves on the stem. Types include alternate (one leaf per node), opposite (two leaves per node), and whorled (more than two per node).
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.