Date post: | 20-Jan-2016 |
Category: |
Documents |
Upload: | shawn-boyd |
View: | 226 times |
Download: | 0 times |
PLANT REPRODUCTION
Plants Reproductive Structures
• Cones: Gymnosperms– Female cones contain the ovules
which contains the egg cell– Male cones contain pollen which are
like sperm cells
• Flowers: Angiosperms– Pistil: female part of flower– Stamen: Male part of flower
Pollination
• Insects visit flowers to search
for nectar – their food.
• But the flowers use the insects for their own purposes!
• As the insect probes for nectar, its body rubs against the stamens.
• Pollen gets stuck on the insect’s legs.
• You can often see bees with a heavy load of yellow pollen on their hind legs.
Pollination
When the insect visits another flower of the same type, the pollen will stick to the pistal.
This is called
pollination.
Fertilization
The pollen travels to the ovary, where it joins with an ovule.
This is called
fertilization.
Seeds
• Seeds: the fertilized egg
• Seed Structure:– Seed coat:
protects plant– Young plant– stored food
Types of Seeds
Types of Seeds
Seeds
• The seeds develop inside the ovary, which grows to become the seed pod or fruit.
Seed Dispersal
• The seeds are dispersed by:– Animals– Wind– Explosion – Water