premise: Land plants are multicellular organisms.
hypothesis: Chemotaxis ( from chemo - + taxis ) is the movement of an organism in response to a chemical stimulus . A sporophyte ( [ spɔːrəʊˌfaɪt ] ) is the diploid multicellular stage in the life cycle of a plant or alga . All land plants , and most multicellular algae , have life cycles in which a multicellular diploid sporophyte phase alternates with a multicellular haploid gametophyte phase .