unit 7 chapter 24 reproduction in plants. alternation of generations the basic life cycle pattern...

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