Notes on chapters of Botany covering the topics: Multicellular Algae, Mosses/Ferns, Plants with Seeds, Seed Plant Reproduction, Plant Structure, and Control of Plant Growth/Development

Chapter 20: Multicellular Algae Characteristics of Algae -Algae are photosynthetic organisms <Tab/>-Live in streams, ponds, lakes, oceans, and swamps <Tab/>-Must live in or near a source of water -Algae lack an internal system -Algae lack an internal system of tubes to move water and materials from one part to another <Tab/>-Water in which algae live provides CO2, oxygen, nutrients, and carries …

…colored accessory pigments appear (autumn foliage) Day Length and Flowering -Photoperiodicity is the response of plants light and dark periods is called <Tab/>-Plants time their flowering according to number of hours of light/darkness received -Short day plants flower because accumulation of certain type of phytochrome during period of darkness triggers flowering (long nights) -Long day plants flower because nights are short <Tab/>-Petunias, hollyhocks, clovers