Seed Dispersal and Germination Interest Grabber From Fruits to Nuts Walk into any supermarket and...
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Transcript of Seed Dispersal and Germination Interest Grabber From Fruits to Nuts Walk into any supermarket and...
Seed Dispersal and Germination
Interest Grabber
•From Fruits to Nuts
•Walk into any supermarket and you will likely see a variety of fruits. Would it surprise you to learn that many of the foods that you think of as vegetables, grains, and nuts are actually fruits?
•1. Name three fruits that you have eaten.
•2. Describe any seeds you found in the fruits.
•3. What function do you think the fruit and seeds serve for a plant?
Section 24-2
Seed Dispersal and Germination
Section Outline
• 24–2 Seed Development and GerminationA. Seed and Fruit Development
B. Seed Dispersal
1. Dispersal by Animals
2. Dispersal by Wind and Water
C. Seed Dormancy
D. Seed Germination
Section 24-2
Seed Dispersal and Germination
that
Concept Map
in
have
Section 24-2
that
have
SeedGermination
Remains withthe seed
Emergeabove ground
Remainbelow ground
Monocots Dicots
1 Cotyledon 2 Cotyledons
Seed Dispersal and Germination
KEY CONCEPT Seeds disperse and begin to grow when conditions are favorable.
Seed Dispersal and Germination
Animals, wind, and water can spread seeds.
• Seeds dispersed by animals can have nutritious fruits or fruits that cling.
Seed Dispersal and Germination
• Seeds dispersed by wind can have wing- or parachute-like fruits.
Cypselae
Double samaras
Seed Dispersal and Germination
• Seeds dispersed by water can have fruits that float.
Seed Dispersal and Germination
Seeds begin to grow when environmental conditions are favorable.• Seed dormancy is a state in which the embryo has stopped
growing. – Dormancy may end
when conditions are favorable.
– While dormant, embryo can withstand extreme conditions.
Seed Dispersal and Germination
Seed Diagram
Seed Dispersal and Germination
• Germination begins the growth of an embryo into a seedling.
– water causes seed to swell and crack coat– embryonic root, radicle, is first to emerge– water activates enzymes that help send sugars to
embryo
Seed Dispersal and Germination
• Germination begins the growth of an embryo into a seedling. – water causes seed to swell and crack coat– embryonic root, radicle, is first to emerge – water activates enzymes that help send sugars to
embryo– embryonic shoot, plumule, emerges next
Seed Dispersal and Germination
• Germination begins the growth of an embryo into a seedling. – water causes seed to swell and crack coat– embryonic root, radicle, is first to emerge – water activates enzymes that help send sugars to
embryo– embryonic shoot, plumule, emerges next
– leaves emerge last
Seed Dispersal and Germination
• Once photosynthesis begins, the plant is called a seedling.