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Pollen grains (magnified)

1 outer wall
2 spikes
3 cytoplasm
4 pollen tube
5 inner wall
6 pore

Step 1 of 3

Labels Squares to copy by

Simplified from: Encyclopaedia Britannica (1911), "Flower", public domain, via Wikimedia Commons

← Layering Self-pollination and cross-pollination →

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