Ch 32 - Flowering Plant Structure

Ch 32 - Flowering Plant Structure - Flowering Plant...

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Flowering Plant Structure, Growth, and Differentiation Chapter 32 90% of seeded plants are vascular and characterized by flowers, endosperm, double fertilization, cotyledons and seeds enclosed within fruits Most successful and most diverse of the plant kingdom Revision - Monocots (Class Monocotyledones) Class includes: palms, grasses, orchids etc Most have floral parts in threes Leaf venation is parallel; fibrous root system Secondary growth is absent, but can contain sclerenchyma tissue – hard and woody Seeds each contain: One cotyledon or embryonic seed leaf Endosperm or nutritive tissue in mature seeds Scattered vascular bundles Revision - Eudicots (Class Eudicotyledones) Class includes oaks, roses, cacti etc Leaf venation is netted (megaphyll) Gymnosperms and woody eudicots have secondary growth Usually have floral parts in fours or fives, or multiples thereof Seeds each contain 2 cotyledons: endosperm is absent; nutrition in cotyledons at germination Taproot system and vascular system in a ring Herbaceous and Woody Flowering Plants Herbaceous plants : Annuals - in temperate and tropical climates, certain aerial stems die back each year (e.g iris, onion, asparagus) Biennials - complete life cycle in 2 years Perennials – aerial parts grow all the year round (e.g. orchid) Woody plants: aerial parts persist via hard, lignified secondary tissues
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Deciduous – shed leaves in Winter, new in Spring Evergreen - shed leaves very slowly (or not at all) Life History Strategy Long-lived trees thrive in tropical rain forests, most small, short- lived plants can’t compete Small, short-lived plants thrive in relatively unfavorable environments
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Ch 32 - Flowering Plant Structure - Flowering Plant...

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