sexual reproduction in flowering plants

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Across
  1. 3. protects the flower bud
  2. 7. most resistant organic material
  3. 9. units of gynoecium
  4. 10. presence of ovules
  5. 12. sterile stamen
  6. 14. stamens attached to petals
  7. 15. site of sexual reproduction
Down
  1. 1. flower with both androecium and gynoecium
  2. 2. free carpels
  3. 4. fruits without fertilisation
  4. 5. part that receives pollen
  5. 6. ovary after fertilisation
  6. 8. grain, male gametes are present in
  7. 11. stamens are collectively called
  8. 13. sepal and petal fused