Yellow cosmos flower is not a single flower. Group of flowers look like a single flower. Such inflorescence named as Head or Capitulum. Outer flowers are ray florets and flowers in the centre are disc florets. I separated disc floret bifid stigma and observed under foldscope. This flower is pollinated. You can see pollen grains on bifid stigma.
Pollen grains on bifid stigma of disc floret
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