ANATOMY OF THE SEED. TAXONOMIC CLASSES Angiosperm—The flowering plants, seeds are borne in an enclosed ovary (Examples Corn, beans and Maples 250,000.

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Presentation transcript:

ANATOMY OF THE SEED

TAXONOMIC CLASSES Angiosperm—The flowering plants, seeds are borne in an enclosed ovary (Examples Corn, beans and Maples 250,000 species). Gymnosperm—The seeds of gymnosperms are borne naked with no ovary (Examples: Pines, spruces, and ginkgo 700 species) Minnesota Tree Care Advisors

SUBCLASSES OF ANGIOSPERMS Monocot—Plants that have one cotyledon (seed leaf) in their seeds (60,000 species). Dicot—Plants that have two cotyledons in their seeds (185,000 species).

Oklahoma Education--

SEED COMPONENTS A seed contains all of the genetic information needed to develop into an entire plant. It contains three parts. (1) Embryo-a miniature plant which will grow when conditions are favorable. (2) Endosperm-built in food supply for the plant. (3) Seed Coat—Hard outer covering, protects the seed from disease and insects. Prevents water from entering the seed before the proper time.

SEED GERMINATION Germination-Seed embryo goes from a dormant state to an active, growing state. Conditions for germination— 1. The seed absorbs water through the seed coat 2. The seed has oxygen 3. The seed has a favorable temperature 4. Some species, require light (Celery) others darkness. 5. Dormancy Period

MONOCOT SEED PARTS

HYPOGEAL EMERGENCE Iowa State University http//maize.agron.iastate.edu/images/corn/fig1.gif

DICOT SEED PARTS

The seedsite.co.uk/seedparts.html

Iowa State University http// Epigeal Emergence

Hypogeal Emergence Epigeal Emergence