Theca
/ˈθiːkə/
Definition
Theca refers to one of the two pollen sacs in a typical anther, the pollen-bearing part of a flower’s stamen. Each anther commonly has two thecae, and each theca usually contains two microsporangia, the chambers where pollen develops. This term helps describe anther structure more precisely than "pollen sac," especially in botany and plant anatomy.
Function in Plants
- Pollen release: In flowering plants, theca is part of the anther and helps position the pollen sacs so pollen can mature and then be released at the right stage of flower development.
- Part of male fertility: Its structure matters for successful pollination because normal anther opening depends on coordinated drying and splitting of the surrounding tissues.
- Useful in flower study: Botanists examine theca when describing stamens, since differences in anther form and attachment can help distinguish plant groups and species.
- Seen in close inspection: This feature is usually too small to notice without careful viewing, but it becomes clearer when a flower is dissected during identification or teaching.
Related Terms
Stamen
Stamen refers to the male reproductive structure of a flower. It usually consists of a filament, the stalk, and an…
Filament
Filament refers to the slender stalk of a stamen, the male reproductive part of a flower. It supports the anther, which…
Pollen
Pollen is a fine, powdery substance made in the anthers of seed plants. It consists of tiny grains that carry the male…
Microsporangium
Microsporangium refers to the pollen-producing spore case in seed plants and other vascular plants. It is a plant…
Flower
Flower is the reproductive structure of a flowering plant, usually containing stamens, which produce pollen, and one or…
Pollination
Pollination is the transfer of pollen from the male part of a flower, the anther, to the female part, the stigma, of…
Microspore
Microspore refers to the small spore produced in the male sporangia of seed plants and many other land plants. It is…