Seeds and Growing Plants - PowerPoint

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					Seeds and Growing Plants

Parts of a plant

Function of plant parts

Parts of a flower

What are seeds?

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

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?
Steps: 1. Seed coat breaks 2. 3. Radicle becomes ROOT Hypocotyl and epicotyl become the STEM

First leaves

4.

First leaves grow = PHOTOSYNTHESIS

PARTS OF A SEED - INSIDE

Plants need NUTRIENTS
Carbon
Hydrogen Oxygen

Soil nutrients

Soil nutrients
Nitrogen – Growth, photosynthesis

Phosphorus – photosynthesis, flowering
Potassium – build proteins, prevent disease

Calcium – Strong cells Magnesium – Photosynthesis
Sulfur - build proteins and produce food

Soil quality - pH

pH=7


				
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posted:4/17/2008
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