The Role of Petals in Flower Pollination

The Role of Petals in Flower Pollination
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Petals are more than just colorful decorations in a flower. They serve an important purpose in attracting insects to the flower for pollination. Petals may have specific guidelines on them,

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Slide3Pe t a l - P e t a l s  a r e  u s e d  t o  a t t r a c t  i n s e c t s  i n t o  t h e  f l o w e r , t h e y  m a y  h a v e  g u i d e l i n e s  o n  t h e m  a n d  b e  s c e n t e d . S t i g m a - I s  c o v e r e d  i n  a  s t i c k y  s u b s t a n c e  t h a t  t h e  p o l l e n g r a i n s  w i l l  a d h e r e  ( s t i c k )  t o . S t y l e - T h e  s t y l e  r a i s e s  t h e  s t i g m a  a w a y  f r o m  t h e  O v a r y  t o d e c r e a s e  t h e  l i k e l i h o o d  o f  p o l l e n  c o n t a m i n a t i o n .  I t v a r i e s  i n  l e n g t h .

Slide4Ovary-This protects the ovule and once fertilization has taken place it will become the fruit. Ovule- The Ovule is like the egg in animals and once fertilization has taken place will become the seed. Flower stalk- Gives support to the flower and elevates the flower for the insects. Sepal- Sepals protect the flower while the flower is developing from a bud .

Slide5Filament-This is the stalk of the Anther. Anther- • The Anthers contain pollen sacs. • The sacs release pollen on to the outside of the anthers that brush against insects on entering the flowers. • Once the pollen is deposited on the insect..it is transferred to the stigma of another flower. • The ovule is then able to be fertilized.

Slide6Male PartsStamen Female Parts Pistil    Anther   Filament Ovary  Stigma Ovule   Style

Slide72 Types of flowers: Perfect vs. ImperfectImperfect- a flower that has either all male parts or all female parts Perfect- a flower that has both male and female parts in the same flower EX: cucumbers, pumpkin, and melons EX: roses, lilies, and dandelions

Slide8Complete vs. Incomplete Flowers• Complete Flowers • Has all 4 main parts • Sepal, petal, pistil, and stamen • Ex.- • Incomplete Flowers • One or more of the 4 main parts of flower is missing • Ex. -windflower

Slide10Angiosperm Life cycle• Pollination -transfer of pollen from the stamen to the pistil. • Pollen -yellow powder that contains sperm cells. • Pollinators transfer pollen’ • Ex.-bees, birds, and other animals

Slide11How are pollinators attracted to aflower? • Nectar  –sweet liquid produced by flowers to attract pollinators. • Flowers -colorful petals, interesting shapes, and scent that appeal to pollinators • Pollination can also occur with the help of the wind. Ex-grasses and some trees

Slide12Seeds• Seeds have 3 main parts • Embryo -offspring that can grow into a new plant • Cotyledon -food supply for the embryo • Seed coat-  tough outer covering Germination -development of a new  seed into a plant

Slide13Seed Dispersal• Float and carried by the wind • Float and be carried by water (coconuts) • Cling to animal fur or feathers • Seed surrounded by fruit which is eaten by animals then passes through their digestive system