Post on 28-May-2015
transcript
2 Types of Seed Plants
• Angiosperms
• Gymnosperms
Gymnosperms
• Have cones for reproduction instead of flowers
• 4 Types – Cycad– Ginkgo– Conifer– Gnetophyte
Gymnosperms
• Cycads: look like ferns except they have seeds
• Ginkgo: very large trees found mainly in China
Gymnosperms
• Conifers: seeds are in cones or berrylike structures
• Gnetophytes: shrubs and climbing vines
Angiosperms
• Largest group of plant in the world• Found in all types of climates• Produce flowers for reproduction
Angiosperms
• Parts of the flower:– Sepals– Petals– Stamen– Pistil
Sepals
• The sepals protect the flower before it opens.
sepal
Petals
• The petals attract pollinating insects with their bright color and attractive scent.
Male Parts• The stamens
are the male structures of the flower.
• Made up of two parts:– Anther– Filament
Male Parts• Anther: top
part of the stamen, that makes pollen.
• Filament: this is the stalk of the Anther
Female Parts• Pistil is the
female structure of flower that has 3 parts:– Stigma– Style– Ovary
Female Parts
• Stigma:– The pollen from
another flower collects on the stigma’s sticky surface.
• Style:– raises the stigma
away from the Ovary
stigma
Female Parts
• Ovary protects the ovules(egg).
• Once fertilization has taken place it will become the fruit.
Write the correct words in the boxes:stamens, stigma, petals, ovary, sepals
these attract insects
4
where the pollen is made
pollen sticks to this 5
2
where the seeds grow
1
These protect the flower before it opens 3
Write the correct words in the boxes:stamens, stigma, petals, ovary, sepals
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: consists of a seed coat, a young plant, and 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; some by animals, some by the wind, some by explosion and some by water.