Presentation on theme: "Everything you need to know about flowers!"— Presentation transcript:
1Everything 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,
2The 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.
13SepalssepalThe sepals protect the flower before it opens.
14PetalsThe petals attract pollinating insects with their bright color and attractive scent.
15Male Parts The stamens are the male structures of the flower. Made up of two parts:AntherFilament
16Male Parts Anther: top part of the stamen, that makes pollen. Filament: this is the stalk of the Anther
17Female PartsPistil is the female structure of flower that has 3 parts:StigmaStyleOvary
18Female Parts Stigma: Style: stigma The pollen from another flower collects on the stigma’s sticky surface.Style:raises the stigma away from the Ovary
19Female Parts Ovary protects the ovules(egg). Once fertilization has taken place it will become the fruit.
20Write the correct words in the boxes: stamens, stigma, petals, ovary, sepals pollen sticks to thiswhere the seeds grow51these attractinsectswhere the pollen is madeYou 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.24These protect the flower before it opens3
22Plants Reproductive Structures Cones: GymnospermsFemale cones contain the ovules which contains the egg cellMale cones contain pollen which are like sperm cellsFlowers: AngiospermsPistil: female part of flowerStamen: Male part of flower
23Pollination Insects visit flowers to search for nectar – their food. But the flowers use the insects for their own purposes!
24Pollen 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.
25Pollination pollination. When the insect visits another flower of the same type, the pollen will stick to the pistal.This is calledpollination.
26FertilizationThe pollen travels to the ovary, where it joins with an ovule.This is called fertilization.
27Seeds Seeds: the fertilized egg Seed Structure: consists of a seed coat, a young plant, and stored food
30SeedsThe seeds develop inside the ovary, which grows to become the seed pod or fruit.
31Seed DispersalThe seeds are dispersed; some by animals, some by the wind, some by explosion and some by water.
32GerminationIf the seed lands in a suitable place, it will germinate, and grow into a new plant.Then the cycle starts all over again.
33Write these words in the boxes: germination, fertilization, pollination, seed dispersal, parent plant, plant growth162534
34Write 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 pollenThe male part of the flowerThese attract insects182This is where pollen is madeInsects carry this from flower to flower73These protect the flower before it opensSlides 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 fertilizationThis is where the seeds will grow465