Answer: Along one carpel's margin.
- A On a central axis
- B Along one carpel's margin
- C All over the ovary wall
- D Scattered freely inside
Correct answer: B. Along one carpel's margin
Explanation: In marginal placentation (e.g. pea) the ovules are attached in a row along the fused margin of a single carpel.
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.