Practice question · Put in order
Arrange these plant innovations in the order they evolved.
- Vascular tissue with lignin, allowing height
- Seeds, freeing reproduction from standing water
- Flowers, recruiting animal pollinators
- Simple non-vascular plants confined to damp places
Hints
- Each innovation removes one constraint that the previous stage still had.
- Flowers are the most recent of the four.
Show the answer
- Simple non-vascular plants confined to damp places
- Vascular tissue with lignin, allowing height
- Seeds, freeing reproduction from standing water
- Flowers, recruiting animal pollinators
Why
Each step lifted a specific limit: lignified vascular tissue allowed height, seeds removed the dependence on water for fertilisation, and flowers replaced wasteful wind pollination with targeted animal delivery.
Practise The Colonisation of Land
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