1. Name three fruits that you have eaten. Section 24-2 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?

24–2 Seed Development and Germination Section 24-2 Section Outline 24–2 Seed Development and Germination A. Seed and Fruit Development B. Seed Dispersal 1. Dispersal by Animals 2. Dispersal by Wind and Water C. Seed Dormancy D. Seed Germination

Concept Map Seed Germination Section 24-2 in Monocots Dicots have have 1 Cotyledon 2 Cotyledons that that Remains with the seed Emerge above ground Remain below ground

KEY CONCEPT Seeds disperse and begin to grow when conditions are favorable.

Animals, wind, and water can spread seeds. Seeds dispersed by animals can have nutritious fruits or fruits that cling.

Seeds dispersed by wind can have wing- or parachute- like fruits. Cypselae Double samaras

Seeds dispersed by water can have fruits that float.

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 Diagram

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

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

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

Once photosynthesis begins, the plant is called a seedling.