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 are seeds so different? Shape Size Colour Texture
Cactus seed under a powerful microscope Seed coat texture
Parts of a seed – Inside the seed
Parts of a seed First leaves Epicotyle = stem
What do seeds need to GERMINATE? Oxygen - Growth Sun Sun - Energy for PHOTOSYNTHESIS Temperature Temperature – Cold? Hot? Warm? Water Water - Photosynthesis and growth
GERMINATION What is germination? Steps: 1.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
Plants need NUTRIENTS Carbon Oxygen Hydrogen 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 nutrients
Soil quality - pH pH=7