What are seeds?.

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Presentation transcript:

What are seeds?

Lesson Objective To dissect and study the morphology and anatomy of a dicotyledonous seed.

Parts of a seed – seed coat Why do seeds have a seed coat? Why do seeds have a seed coat?

Why are seeds so different? Shape Size Colour Texture

Seed coat texture Cactus seed under a powerful microscope

What is a dicotyledonous seed?

Dicot = 2 Cotyledons

Parts of a seed – Inside the seed

Parts of a seed First leaves Epicotyle = stem

What do seeds need to GERMINATE? Oxygen - Growth Sun - Energy for PHOTOSYNTHESIS Temperature – Cold? Hot? Warm? Water - Photosynthesis and growth

GERMINATION What is germination? First leaves Steps: Seed coat breaks 2. Radicle becomes ROOT 3. Hypocotyl and epicotyl become the STEM 4. First leaves grow = PHOTOSYNTHESIS First leaves

PARTS OF A SEED - INSIDE