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A flower has been pollinated. What must still happen before a seed can form?
AThe petals must fall off
BThe stem must grow taller
CThe leaves must turn green
DTwo sex cells must join
Answer & Solution
Correct answer: D. Two sex cells must join
1. Pollination only delivers the pollen grain to the stigma.
2. The pollen grain then grows a tube down through the style to the ovary.
3. A male sex cell travels down that tube to reach an ovule.
4. The male and female sex cells fuse together, and this is fertilisation.
5. Only after fertilisation does the fertilised egg grow into a seed.
6. Petals falling and stems growing are not needed for a seed to form.
_Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Fertilisation_
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