Carpel 2026-10-14
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A female reproductive unit of a flower, comprising a stigma, a style and an ovary. A flower may have several carpels, including fused ones.[ref]
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Flower Created 2026-10-14 Updated 2026-10-14
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A flower is an angiosperm's reproductive structure. Stamens produce pollen; carpels enclose ovules. Petals and sepals surround these organs in a complete flower, but some flowers lack one or more groups, including either reproductive group.[ref]
Figure 1.
Flower organs and the enclosure of ovules
. Original schematic cutaway of a flower with both reproductive groups. Colors separate functions; shapes, organ counts and relative sizes are illustrative. The enlarged ovule belongs inside the ovary, not on the stigma. The sketch is not a universal arrangement. Details.
Read the drawing from outside inward, then trace two routes: where pollen is released, and where an ovule is enclosed. This reveals why catching pollen and forming a seed require different structures. A detached petal cannot substitute for a stigma simply because both belong to the same flower.
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Ovary (botany) 2026-10-14
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The carpel region enclosing one or more ovules.
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Stigma (botany) Created 2026-10-14 Updated 2026-10-14
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The stigma is the carpel's pollen-receiving region. Compatible pollen may form a pollen tube that grows toward an ovule; arrival alone does not establish fertilization.[ref]
A useful diagnostic question is what was actually observed: pollen on a stigma, a growing pollen tube, or a new plant embryo? Each observation tests a different stage. A pollen tube germination assay isolates the middle process for direct viewing.
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