Generated by claude-sonnet-4-6 · 2026-06-15 06:42 · grounding rag
Model Answer
(i) Self-Pollination vs Cross-Pollination:
| Self-Pollination | Cross-Pollination |
|---|---|
| Transfer of pollen from anther to stigma of the same flower or same plant. | Transfer of pollen from anther to stigma of a different flower on a different plant of the same species. |
| No pollinating agent required. | Requires agents like wind, water, insects, etc. |
(ii) Identification of A, B, C (Longitudinal Section of a Flower):
Based on a standard diagram of a flower's reproductive parts:
- A – Stigma: It is the top part of the pistil. Function: It receives pollen grains during pollination (sticky surface traps pollen).
- B – Style: It is the elongated stalk connecting stigma to the ovary. Function: It provides a passage for the pollen tube to grow down towards the ovary.
- C – Ovary: It is the swollen base of the pistil containing ovules. Function: It contains ovules which, after fertilisation, develop into seeds; the ovary develops into fruit.
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Explanation
- For (i), examiners expect a clear point-by-point or tabular comparison — at least 2 differences for 2 marks.
- For (ii), since the actual diagram is not visible, A/B/C are identified as the three standard parts of the pistil (stigma, style, ovary) — the most commonly labelled structure in CBSE Chapter 7 diagrams on sexual reproduction in plants. Each part must be named + one function stated for full marks (1 mark per part). If your diagram labels different structures (e.g., anther, filament, petal), apply the same format: name + one function each.