Generated by claude-sonnet-4-6 · 2026-06-15 06:44 · grounding rag
Model Answer
(i)
(1) Leaves of Bryophyllum on soil: Buds present on the leaf margins develop into new plants. Mode: Vegetative propagation.
(2) Planaria cut into many pieces: Each piece regenerates and grows into a complete new organism. Mode: Regeneration.
(3) Rhizopus sporangia liberate spores: The spores germinate under favourable conditions of moisture and warmth to grow into new Rhizopus organisms. Mode: Spore formation.
(ii) Changes after fertilisation in a flower:
- The zygote develops into an embryo.
- Ovules develop into seeds.
- The ovary develops into a fruit.
- Petals, sepals, stamens, style, and stigma wither and fall off.
- The wall of the ovary becomes the fruit wall (pericarp).
Source: Chapter 7 – How do Organisms Reproduce?, Sections 7.2 and 7.3
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Explanation
- For part (i), examiners expect both: what happens + name of the mode. Naming the mode correctly fetches the mark.
- Bryophyllum = vegetative propagation (not budding); Planaria = regeneration; Rhizopus = spore formation — these three must not be confused.
- For part (ii), the key changes are ovule→seed, ovary→fruit, and the withering of other floral parts. These are standard board-exam points and must be listed clearly.