Presentation on theme: "Seeds and Fruits. Alternation of Generations All plants have a life cycle in which a diploid sporophyte generation alternates with a haploid gametophyte."— Presentation transcript:
Seeds and Fruits
Alternation of Generations All plants have a life cycle in which a diploid sporophyte generation alternates with a haploid gametophyte generation.
Moss have a dominant gametophyte Non-vascular
Ferns have a dominant sporophyte Vascular
Gymnosperm Lifecycle Vascular Wind pollinated!
Structure of Flowers Vascular
Fruit Development As angiosperm seeds mature, the ovary walls thicken to form a fruit that encloses the seeds that developed from the ovules.
Types of Fruits Hip Hesperidium Accessory Berry Pome Drupe Caryopsis Capsule Pepo Achene Multiple Nut Legume Samara SchizocarpSilique Follicle
Animal Pollination & Dispersal
Wind Pollination & Dispersal
Seed Development Hypocotyl – embryo attaches to cotyledons. Radicle – embryonic root Epicotyl – will develop into stem. Plumule – develops into first leaves. Scutellum – absorbs nutrients during germination. Coleorhiza – sheath that covers young root. Coleoptile – covers shoot
Seed Germination Monocot Dicot
Seeds and Fruits Lab
Plant Propagation & Agriculture Vegetative reproduction includes the production of new plants from horizontal stems, cuttings, leaves, plantlets, and underground roots. Horticulturists use plant propagation to make many identical copies of a plant or to produce offspring from seedless plants. Most of the people of the world depend on a few crop plants, such as wheat, rice, and corn, for the bulk of their food supply. Peanut Flower