<Li> Corolla: the next whorl toward the apex, composed of units called petals, which are typically thin, soft and colored to attract animals that help the process of pollination . </Li> <Ul> <Li> Androecium (from Greek andros oikia: man's house): the next whorl (sometimes multiplied into several whorls), consisting of units called stamens . Stamens consist of two parts: a stalk called a filament, topped by an anther where pollen is produced by meiosis and eventually dispersed . </Li> <Li> Gynoecium (from Greek gynaikos oikia: woman's house): the innermost whorl of a flower, consisting of one or more units called carpels . The carpel or multiple fused carpels form a hollow structure called an ovary, which produces ovules internally . Ovules are megasporangia and they in turn produce megaspores by meiosis which develop into female gametophytes . These give rise to egg cells . The gynoecium of a flower is also described using an alternative terminology wherein the structure one sees in the innermost whorl (consisting of an ovary, style and stigma) is called a pistil . A pistil may consist of a single carpel or a number of carpels fused together . The sticky tip of the pistil, the stigma, is the receptor of pollen . The supportive stalk, the style, becomes the pathway for pollen tubes to grow from pollen grains adhering to the stigma . The relationship to the gynoecium on the receptacle is described as hypogynous (beneath a superior ovary), perigynous (surrounding a superior ovary), or epigynous (above inferior ovary). </Li> </Ul> <Li> Androecium (from Greek andros oikia: man's house): the next whorl (sometimes multiplied into several whorls), consisting of units called stamens . Stamens consist of two parts: a stalk called a filament, topped by an anther where pollen is produced by meiosis and eventually dispersed . </Li> <Li> Gynoecium (from Greek gynaikos oikia: woman's house): the innermost whorl of a flower, consisting of one or more units called carpels . The carpel or multiple fused carpels form a hollow structure called an ovary, which produces ovules internally . Ovules are megasporangia and they in turn produce megaspores by meiosis which develop into female gametophytes . These give rise to egg cells . The gynoecium of a flower is also described using an alternative terminology wherein the structure one sees in the innermost whorl (consisting of an ovary, style and stigma) is called a pistil . A pistil may consist of a single carpel or a number of carpels fused together . The sticky tip of the pistil, the stigma, is the receptor of pollen . The supportive stalk, the style, becomes the pathway for pollen tubes to grow from pollen grains adhering to the stigma . The relationship to the gynoecium on the receptacle is described as hypogynous (beneath a superior ovary), perigynous (surrounding a superior ovary), or epigynous (above inferior ovary). </Li>

Where do flowers get their colour from in hindi