110 likes | 228 Views
Sexual Reproduction. Topic #2022A Nick Wendling. Sexual Propagation. Reproduction by seed Most plants are started from seed Normal for vegetables, flowers, grains, and forest trees. Advantages. Economical Easier Seeds can be stored for long periods of time
E N D
Sexual Reproduction Topic #2022A Nick Wendling
Sexual Propagation Reproduction by seed Most plants are started from seed Normal for vegetables, flowers, grains, and forest trees
Advantages • Economical • Easier • Seeds can be stored for long periods of time • Less likely to transmit disease to offspring
Disadvantages • Inconsistent in genetic makeup • Slow to mature • Some plants do not produce viable seeds
Seed Production • Seeds are produced in flowers • Flowers contain both sexual and sterile parts
Sterile Parts • Receptacle • Sepals • Petals
Sexual, or Fertile Parts • Male stamens, which make pollen • Female pistils, which contain egg bearing ovules
Stamen • Filament – the supportive structure of the anther • Anther – where pollen is located
Pistils • Stigma – collection area for pollen • Style – the tube that leads the pollen to the ovary • Ovary – the ovule bearing part of the plant
Pollination • The transfer of pollen from the anther to the stigma • Once the pollen reached the stigma it stays there because of the sticky exudate. • The pollen grain then sends out a tube down the style all the way to the ovary within the ovule
Fertilization • A nucleus from the pollen tube unites with the egg nucleus in an ovule, making a zygote. • Each fertilized egg develops into a seed