By O. F. G. Kilgour (auth.)
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Dust-like pollen is produced by a male cone. Conifers are trees or shrubs, often with needle-like evergreen leaves. They include spruce or christmas tree, pine, Cupressus or juniper, and Taxus or yew. The Larix or larch is deciduous and loses its leaves in autumn. 6). The class is divided into two subclasses, the Monocotyledons and Dicotyledons. The latter is the more numerous species, accounting for 60% of species in the class. (1) Subclass Monocotyledons This includes over 20 families including grasses or Gramineae, orchids or Orchidaceae, lilies or Liliaceae, irises or lriaaceae and daffodils or Amaryllidaceae.
For example, the class 'mammals' is composed of the orders of insect-eaters, hoofed animals, bats and apes or primates. Each order is composed of one or more families. The flowering plants are important examples in having 123 different families ranging from the buttercup family 'Ranunculaceae' to the grass family 'Gramineae'. Each family will be composed of the genus and species giving the name of the individual organism. 1 summarises the classification of a meadow buttercup and a human being. , are called taxons.
Use the fme adjustment to focus the image accurately. (v) Change the objective over to medium xiO or high-power x40, and adjust illumination by the diaphragm to obtain more light. Observations Always commence with the low-power x4 objective, to locate the specimen and any particular region. Then make a detailed examination with the highpower objective. Clean optical surfaces with soft lens tissue damped with ethanol or propanol. 1 the electron microscope (Bayer Ltd) Schwann (1810-1882}, an anatomist, in 1839 put forward the theory that all animals and plants are composed of units of construction called cells.
