Unit 7Chapter 24Reproduction in Plants

Alternation of generations

The basic life cycle pattern for most plants

Sporophyte stageDiploid, asexual,

produces spores Gametophyte stage

Haploid, sexual,

produces gametes

Vegetation Propagation

A type of asexual reproduction where a new plant is produced from existing plant organs or parts

Ex: plant “cuttings”

Life cycle of Mosses

Moss life cycle

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Life cycle of Ferns

Life cycle of Conifers

Gymnosperm life cycle

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Flower structure Petals Colorful, to attract

pollinators

Sepals Leaflike, to protect

inner organs

Stamen (male organ) Contains anther,

produces pollen

Pistil (female organ) Contains ovary,

produces eggs

Life cycle of a flowering plant Double fertilization

One sperm joins the egg, while the other joins the central cell, forming the endosperm

EndospermFood storage tissue

that supports development of growing embryo

Double fertilization

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Fruit formation The mature ovary containing seeds Modified for seed dispersal

Fruit structure

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Seed germination

The beginning of the development of a new plant after a period of inactivity, called dormancy

First to appear is the radicle (embryonic root) followed by the hypocotyl (embryonic stem)

Seed (containing embryo plant)to mature plant, capable of photosynthesis