BIO 121 Lecture Notes - Lecture 25: Seed Dispersal, Cotyledon, Eudicots
10 Dec 2020
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Flowering plants: the a game: seeds are protected by integument (seed coat) the megasporophylls of the female cones (or strobili) Seeds protected by integument(seed coat), pistil (ovary: ovule production) and protective fruit. Perfect flower: has functioning anthers and ovaries, may or may not have a corolla/ calyx. Complete flower: has anthers, ovary, petals, and sepals. Reduced flowers: tiny flowers, often with no petals or sepals, and often with only a few anthers/ carpels. Dioecious species: have amel with unisexual male flowers and femals with unisexual female flowers. Monoecious species: hermaphroditic individuals with unisexual male and female flowers. Simples pistils have simple design (one carpel); compound pistils have many carpels (lemon look) Monocots: single cotyledon in seeds: narrow- leaves, parallel venation flower parts in 3s: vascular bundles scattered through cortex, in the stem. Lilies, onions, grass, cereals, pineapples, orchids, palms; sedges. Eudicots: two cotyledons; broad-leaves; net-like venation; flower parts in 4 and 5; vascular bundles in ring in stem.
