Angiosperm_Terms - anther The terminal pollen sac of a...

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anther The terminal pollen sac of a stamen, inside which pollen grains with male gametes form in the flower of an angiosperm. angiosperms Any plant that is a member of the class Angiospermae, in which the seeds are enclosed in an ovary. Each member of the class is either a monocotyledon (grasses, tulips) or a dicotyledon (apple, primrose). antipodal The three haploid nuclei which are formed during megasporogenesis in plants. They are all located opposite the micropyle end of an ovule. archegonium (pl. archegonia) The female sex organ of liverworts, mosses, ferns, and most gymnosperms. It isusually a flask-shaped organ, comprising a swollen base or venter containing asingle egg-cell and a slender elongated neck containing one or more layers ofcells. calyx A collective term for all the sepals of a flower. carpel The female reproductive organ of a flower, consisting of the stigma, style and ovary. central cell Found in the central region of the megagametophyte, it contains two polar nuclei. corrola A collective term for all the petals of a flower. The petals are often brightly coloured and attract pollinating animals. The corolla encloses the reproductive organs, and is itself protected by the sepal. cotyledons The one (monocot) or two (dicot) seed leaves of an angiosperm embryo. embryo sac The female gametophyte of angiosperms, formed from the growth and division of the megaspore into a multicellular structure with eight haploid nuclei. endosperm A nutrient-rich tissue formed by union of a sperm cell with two polar nuclei during double fertilization, which provides nourishment to the developing embryo in angiosperm seeds. flower A structure involved in sexual reproduction. It consists of the androecium (male organs) and gynoecium (female organs), surrounded by a corolla and a calyx. The male and female parts may or may not be in the same flower. funinculus
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This note was uploaded on 05/18/2008 for the course BIO G 104 taught by Professor Chen,k.c during the Spring '06 term at Cornell University (Engineering School).

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Angiosperm_Terms - anther The terminal pollen sac of a...

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