Linked from
The 14 pages that link to Cotyledon, each with the reason it gives.
SeedBroader topic: In some seeds, cotyledons store or deliver resources instead of endosperm.
AcornBroader topic: Acorn cotyledons store much of the energy used during germination.
SeedlingBroader topic: Cotyledons nourish or feed the seedling before true leaves take over.
DicotyledonBroader topic: The two seed leaves give dicotyledons their name.