Unit 7 Chapter 24 Reproduction in Plants

Alternation of generations The basic life cycle pattern for most plants Sporophyte stage Diploid, 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

Click on image to play video. Moss life cycle Click on image to play video.

Life cycle of Ferns

Life cycle of Conifers

Click on image to play video. Gymnosperm life cycle Click on image to play video.

Flower structure Petals Sepals Stamen (male organ) 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 Endosperm Food storage tissue that supports development of growing embryo

Click on image to play video. Double fertilization Click on image to play video.

Fruit formation The mature ovary containing seeds Modified for seed dispersal

Click on image to play video. Fruit structure Click on image to play video.

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