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Frage 109

What happens at the moment of fertilisation in a flowering plant?

  1. Pollen lands on the stigma of a flower
  2. The ovary swells and begins to ripen
  3. A seed splits open and a young root pushes out
  4. A pollen nucleus joins the nucleus of an ovuleRichtige Antwort

Erklärung

Fertilisation is the union of two sex cell nuclei, and in a flowering plant that union takes place deep inside the ovary once material from the pollen has travelled to an ovule. Pollen settling on the receiving surface is only the delivery step and can happen without any union following, so arrival and union are not the same moment at all.

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Frage 109: What happens at the moment of fertilisation in a flowering… · Plants and Photosynthesis · Questena