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absorbed Algae animals antheridia appear archegonia arrangement Bacteria bark blade branches Bryophytes buds called cambium carbon dioxide carpels chemical chiefly chlorenchyma chlorophyll chromosomes clusters color containing develop dissemination diverse ducts egg cell elongated embryo sac epidermis epiphytes familiar Ferns fertilization fibro-vascular bundles flowers foliage formation fruits function Fungi gardens geotropism germinating grains grape sugar green grow growth habitats herbs higher plants insects kinds known layers leaf leaves light living medullary rays method morphological Mosses mycelium occur organs ovary ovules oxygen parasites petals petioles phloem photosynthetic phyllotaxy physiological pistils pollen produce prominent proteins protoplasm reproduction respiration roots saprophytes seeds sepals sexual showing shrubs soil species sperm cells Spermatophytes sporangia spores sporophyte stamens starch stems stomata structure substances surface tion tips tissues transpiration trees tropical tube typical usually vegetation forms veins walls wind wood xanthophyll xerophytic xylem zoospores
Strona 22 - The average person knows that atmospheric air contains about 21 per cent, of oxygen and 79 per cent, of nitrogen (with other inert gases), mixed with a trace of carbon dioxide and varying amounts of water-vapour.
Strona 21 - ... adapted to spread chlorenchyma to light. The formation of the sugar being thus a process of synthesis under action of light, is known as PHOTOSYNTHESIS. What now are the materials from which the grape sugar is constructed? The chemical formula of grape sugar is...
Strona v - A very good, up-to-date college text, "written in the knowledge that to nearly all college students an introductory course in Botany is part of a general education, and not a preparation for a professional botanical career ... In conformity with this aim, the book gives more attention to the large and visible aspects of plant nature than to the minute and obscure.