Page 231 - Primary Six Notes

 Some flowers are buried in the ground until self- pollination

has taken place

Characteristics of self- pollinated flowers

 Filaments are longer than the style making it easy for pollen

grains to fall on the stigma

 The flowers don’t produce nectar

 The flowers don’t have scent.

Examples of plants that undergo self-pollination.

Beans, Ground nuts, Simsim, Tomatoes, green paper, ground-

nuts, eggplants, etc.

Advantages of self pollination

 It helps to maintain pure breeds

Disadvantages of self pollination

 Flowers that undergo self -pollination are difficult to polli-

nate because stamen sometimes do not mature at the same

time as the pistils.

 Continued rise of poor quality offspring if parent plant is a

poor breed.

Cross pollination

Cross pollination is the transfer of pollen grains from the an-

ther of a flower to the stigma of another flower of the same

kind.

This type of pollination results in healthier seeds and plants.