BIOL 2242 Lecture 3: Flowering Plants Lec 3

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 2242
• Professor: Isobel Waters

Document Summary

Represents next sporophytic generation: stored food reserve (ploidy varies) Major reserve in exalbuminous seeds e. g. bean, pea. Energy transferred to it from endosperm by maturity: seed coat (testa) (2n) Arises from integuments around ovule in female flower. Parts of the embryo: radicle or embryonic root. Has coleorhiza (protective sheath) in grasses e. g. corn: hypocotyl (text lumps with root but distinct) Stem-like portion with radicle and point of attachment of cotyledon (s) Elongates in some spp into hook: cotyledon (s) (seed leaves) Transfers energy (nrg) from endosperm to embryo. May emerge above ground & become photosynthetic (ps: epicotyl (text uses term for stem portion only) Term can include foliage leaves i. e. embryonic shoot= stem + leaves. A monocot seed (corn, p. 531: same 3 parts. Corn (& all grasses) has 1-seeded fruit, so testa is fused to pericarp (ovary wall: albuminous. Cotyledon (scutellum) exists but is transfer agent only. Seed dispersal (p. 493-495: movement from origin on parent plant to germination site.