Pollination occurs when a pollen grain

Options :
  1. Matures and has three nuclei
  2. Lands on a stigma
  3. Releases its sperm nuclei
  4. Releases its pollen tube nucleus
Answer and Explanation :-

Answer: Option 2

Explanation:

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Oh, but I was an idiot. Wanting to be whatever magic she waited for, when I had no magic - only darkness or death to give. But it seemed in that one instant, when she turned to discover what was behind her, that I could have brought happiness to at least one mortal. Me and my dreams of goodness. I had always been a fool for them.
-Krisi Keley On the Soul of a Vampire