Life cycles of mosses and ferns презентация

Aim of lesson
Explain the features of asexual and sexual generations as in mosses and ferns

Key terms
Sporophyte - the form of a plant in the alternation of generations that produces spores
Gametophyte - the sexual form of a plant in the alternation of generations

Life cycle of plants
Plant life begins with germination of spores.A spore grows into a gametophyte, an organism which produces gametes. Gametes are fertilized and become sporophyte, an organism which produces spores.

Mosses

Mosses - are plants which don’t have flowers and seeds. They lack transport system, so they absorb water by the whole body.
Sporangium - capsule where spores are formed

Ferns

Ferns are also spore-bearing plants. But have vascular tissue.
Ferns sporangia are located under leaves

Ferns sporangia are located under leaves

In mosses gametophyte plant is dominant, in ferns sporophyte plant is dominant.