1. Certain varieties cannot be fertilised with their own pollen.

2. Only one sperm fertilises an egg.

3. Non-identical twins are the result of two fertilised eggs implanting in the uterus at the same time.

4. A donor egg fertilised by her husband's sperm will be implanted in her womb.

5. If the egg is not fertilised oestrogen and progesterone decrease.

6. All were then fertilised with sperm from her husband.

7. As this happens, the fertilised egg is carried down the fallopian tube into the uterus.

8. The net result, say some officials, is that foreign money has frequently ended up fertilising or irrigating opium fields.

9. The eggs are implanted in the recipient and fertilised by her partner's sperm.

9. is a online sentence dictionary, on which you can find excellent sentences for a large number of words.

10. A donor egg fertilised by her 51-year-old husband's sperm was implanted in her womb.

11. The banks were used as limitless reservoirs to fertilise growth, indulge political fantasy and bribe the governments' friends.

12. Immediately after fertilising operations have ceased, banking-up is performed by ploughing an angled blade between each row of vines.

13. The fertilised eggs are not then laid but remain inside the female's oviduct.

14. Numerous sperm trying to to fertilise a human egg.

15. Numerous sperm trying to to fertilise a human egg. They are trying to find their way through the zona pellucida, the membrane that surrounds and protects the egg.

16. Could the wave function of his spermatozoa fertilise every lady whose slit he is penetrating, so that he could fertilise multiple women simultaneously?

17. The faeces contain nitrogen and it is that which fertilises the desert soil.

18. The spawning was a brief affair with some thousand or so eggs being scattered and fertilised in a matter of seconds.

19. Its rich pastures are cropped by semi-wild sheep and fertilised by the prolific bird life.

20. His sperm ducts empty into this pouch so that the eggs are quickly and efficiently fertilised.

21. By leading a solitary existence, he avoids competing with the females that he has fertilised.

22. This hormone is produced by the developing embryo within a few days of the egg being fertilised.

23. The team also found that 57 per cent of the eggs were able to be successfully fertilised using a standard technique.

24. A male toad has to be persuasive to get a female to mate with him - in fact, he has to squeeze the eggs right out of her before he can fertilise them.

25. Blocking a river with a dam also blocks the movement of fish upstream to spawn and the movement of silt downstream to fertilise fields.

26. Students first viewed a PowerPoint presentation illustrating how sperm fertilise eggs.

27. They are able to produce enough sperm not only to fertilise the female's eggs, but to form a barrier that prevents any other sperm from getting through.

28. So you may wonder, if your boyfriend were to ejaculate while his penis-wave-function is penetrating multiple slits simultaneously, how many ladies could he potentially fertilise?

29. This enhanced reproductive efficiency is multiplied by the ability of men-with-very-small-penises to fertilise multiple ladies every time they indulge in sexual intercourse.

30. Countries as diverse as Canada, China, France and Indonesia have vowed to cultivate greenery in an effort to fertilise their wilting economies.

31. One widely discussed idea, which the Royal Society's correspondents re-examine, is to fertilise the oceans with iron.

32. Hillis thinks this can be explained if the asexual clams sometimes fertilise eggs from another species and retain some or all of their genes, rather than ejecting them.

33. The brown membrane surrounding the egg cell is the zona pellucida. The head of the sperm carries special enzymes to dissolve this membrane,(http:///fertilise.html) which it must do in order to fertilise the egg.

34. "But how does the sperm get in to fertilise the eggs?" she asked.

35. Female spiders can do this because they store sperm for a period of days or weeks before they use it to fertilise their eggs.

36. Even if he did fertilise the egg of a non-paired female it would not survive as it takes two adults to raise a single chick.

37. Here a close - up of a number of sperm trying to fertilise an egg.

38. The Newcastle research also paves the way for a woman to grow her own sperm and use it to fertilise her natural eggs, creating a child to which she is both mother and father.

39. The programme, a dramatisation of the epic journey sperm undertake in their quest to fertilise the egg, reveals other fertility secrets.

40. The 'artificial sperm' were then used to fertilise eggs, leading to the birth of 60 'grossly healthy' baby mice, who went on to have families of their own, the journal Cell reports.