Published byMariam Brackenridge Modified over 8 years ago
Everything you need to know about flowers!
Please feel free to change anything in order to tailor these slides for your own use – you might wish to use this presentation as revision or as an introduction to the topic – I hope that it is of use!! 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
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 sepal The sepals protect the flower before it opens.
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: Style: stigma
The pollen from another flower collects on the stigma’s sticky surface. Style: raises the stigma away from the Ovary
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
pollen sticks to this where the seeds grow 5 1 these attract insects where the pollen is made You might like to stop the show here and print out this slide. If you are using the Powerpoint version, go to Format, Background, Background Fill, and choose white, then click on Apply. This will change the background of this slide only to white so that you can print more economically. Change back to the original colour before you show the slides again. The children could now examine some flowers, identifying the parts, looking at them through a hand lens etc. When you think they are ready to move on to pollination, show the slides again from the beginning for revision, or start at the first pollination slide. 2 4 These protect the flower before it opens 3
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!
Pollen gets stuck on the insect’s legs.
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.
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.
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 1 6 2 5 3 4
Write the correct words in the boxes: stamen, stigma, petals, ovary, ovules, pollen, sepals, anther.
This is the female part of the flower, which receives the pollen The male part of the flower These attract insects 1 8 2 This is where pollen is made Insects carry this from flower to flower 7 3 These protect the flower before it opens Slides 18 and 19 can be printed and used as worksheets – remember to change the background colour to white if you want to save ink (see notes with slide 10)– for black and white copying a white background is of course preferable anyway. These become seeds after fertilization This is where the seeds will grow 4 6 5
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