Sentence Examples

  • This process of self-fertilization is the usual method, and no doubt keeps the variety true or unmixed; but the occasional presence of varieties in a wheat-field shows that cross-fertilization is sometimes secured.
  • Only where there is no such struggle for existence does self-fertilization often prove satisfactory for many generations."
  • Self-fertilization occurs when the pollen of a given flower affects the egg-cell of the same individual flower.
  • But even in plants with hermaphrodite flowers self-fertilization is often provided against by the structure of the parts or by the period of ripening of the organs.
  • They differ structurally from the normal form in being capable of self-fertilization only, and in the shape and details of their spermatozoa.