Thursday, 2 April 2015


REPRODUCTION IN FLOWERING PLANTS-GENERAL SCIENCE(Biology-Ncert-class 12)

anther,stigma,pistil,ovule,ovary,receptacles,sepals ,petals,carpels,parts of flowering plants

Microsporogenesis- Microsporogenesis is the process of formation of microspores in microsporangia.

Tapetum-Tapetum is the innermost wall layer of a microsporangium and consist of large multinucleate/polyploidy cells.

Placenta-Placenta is the tissue on which the ovules develop and are attached to the ovary wall.

Megasoprogenesis-Megasporogenesis is the process of formation of megaspores in megasporangia(ovules)

Pollination-Pollination refers to transfer of pollen grains from anther to stigma.
types of pollination,pollination

Autogamy-Autogamy (self pollination) refers to the transfer of pollen grains from anther to stigma of the same flower

Geitonogamy-Geitonogamy refers to the transfer of pollen grains from anther to stigma of another flower of the same plant.

Xenogamy/Allogamy-Xenogamy(cross pollination) refers to the transfer of of pollen grains from anther to stigma of another flower on different plants of the same species.

Anemophily-Anemophily refers to pollination by wind

Entomophily- Entomophily refers to pollination by insects.

Hydrophily-Hydrophily refers to pollination by water.

Cleistogamy-Cleistogamy is the phenomenon in which the bisexual flowers do not open at all;such flowers are cleistogamous flowers.

Chasmogamy-Chasmogamy is the phenomenon in which flowers open and expose their stamens and pistil;such flowers are chasmogamous flowers.

Monoecy-It is the phenomenon or condition,where both male and female flowers are present on the same plant.

Dioecy-It is the phenomenon or condition,where  a plant bears exclusively male flowers or female flowers plant.

Emasculation-Emasculation is the process of removal of anthers from bisexual flowers before the pollen grains mature.

Hypocotyl-Hypocotyl is the region of embryonal axis between the point of attachment of cotyledons and radical.

Epicotyl-Epicotyl is the region of embryonal axis between the point of attachment of cotyledons and radical.

Testa-Testa is the outer layer of seed coat,that develops from the outer integument of the ovule.

Tegmen-Tegmen is the inner layer of seed coat,that develops from the inner integument of the ovule.

Apomixis/Agamospermy-Apomixis is aform of reproduction in which seeds are formed without fusion of gametes.

Parthenogenesis-Parthenogenesis is the phenomenon in which the unfertilized female gamete or ovum develops into an adult individual.

Parthenocarpy-Parthenocarpy is the phenomenon of formation of fruits without fertilization.

Polyembryony –Polyembryony refers to the presence of more than one embryo in a seed.

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