Development of pollen grain

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Across
  1. 2. The male reproductive structure in a flower.
  2. 4. The structure that carries male gametes to the ovule.
  3. 5. The diploid (2n) cell that undergoes meiosis to form pollen grains.
  4. 8. The part of the pollen grain that helps in tube formation.
Down
  1. 1. The two nuclei in the embryo sac that fuse with a male gamete.
  2. 3. The opening in the ovule that allows pollen tube entry.
  3. 6. The haploid cell that develops into the embryo sac.
  4. 7. The protective outer layer of pollen grains.