Presentation on theme: "Everything you need to know about flowers! Ann Morris, Science Advisory Teacher, PPEC, 29.4.02."— Presentation transcript:
Everything you need to know about flowers! Ann Morris, Science Advisory Teacher, PPEC,
The Life Cycle of Flowering Plants The life cycle shows the main stages in the life of a flower, from seed to flower and to seed again. This is the process of reproduction.
2 Types of Seed Plants Angiosperms 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
Why are some flowers so colorful? Many flowers have brightly coloured petals and an attractive scent. This is so that they attract bees and other insects.
What does a flower do? The main function of a flower is to reproduce and make new seeds so that new plants will grow each year.
If you look carefully at a flower, you will see that it is made up of many different parts.
Each part has an important job to do.
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 stigmas 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
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 insects 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
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.
Germination If the seed lands in a suitable place, it will germinate, and grow into a new plant. Then the cycle starts all over again.
Write these words in the boxes: germination, fertilization, pollination, seed dispersal, parent plant, plant growth
Write the correct words in the boxes: stamen, stigma, petals, ovary, ovules, pollen, sepals, anther. The male part of the flower This is where pollen is made Insects carry this from flower to flower These attract insects 1 This is the female part of the flower, which receives the pollen 2 These become seeds after fertilization 5 This is where the seeds will grow 4 These protect the flower before it opens 6