Polar nuclei : They fuse with second male gamete to form triploid cell which form endosperm this is known as triple fusion feature of angiosperms. Endosperm provide nourishment to the developing embryo.
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CHIROPTEROPHILY : Transfer of pollen grain from anther to stigma of different plants by bats. The flower are large dull coloured and have strong scent. Ex. Adansonia
ORNITHOPHILY: Transfer of pollen grain from anther to stigma of different plants by birds.
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Geitonogamy :Pollen from anther of one flower transfer to the stigma of different flower born on the same plant.
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CIRCINOTROPOUS OVULE: Ovule is straight with micropyle facing upward funicle is in coiled encircle the ovule.It is orthotropous but inverted in the course of development
Ex. Opuntia
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•AMPHITROPOUS OVULE
Body of ovule curved in such a way that it has horse shoe shape.Embryo sac is also horse shoe shape. Micropyle,chalaza and hilum come close to each other. Ex. Capsella
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Epigynous: Thalamus is usually flask shaped or tubular . Calyx corolla and androecium born on the upper part of thalamus above the level of the ovary . Ovary is completely enclosed by thalamus and its walls are fused with thalamus .Ovary is inferior in this case .Ex. Cucurbita.
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