1. Natural Sciences Grade 7
Term 1: Life and Living
Sexual Reproduction (Part 1)
(PPT 1)

2. Topic 3 Sexual Reproduction
Sexual Reproduction in Angiosperms
Natural Sciences – Grade 7

3. Structure of a flower
The parts of a flower are arranged in circles that fit into each other.
These circles are called whorls.
First (outer) whorl = sepals
Second whorl = petals
Third whorl = stamens (Male whorl)
Fourth whorl = pistil (Female whorl)
Flowers are the reproductive organs of the Angiosperm plant.
Most flowers contain male and female parts.
Sperms form in the male parts of the flower and Ova (eggs) from in the female parts of the flower.
Natural Sciences - Grade 7
Natural Sciences - Grade 7
Natural Sciences - Grade 7

4. Structure of a flower Natural Sciences - Grade 7

5. Male structures of a flower
Male parts are called stamens.
They consist of:
anther, which has pollen grains and which contain sperms (male sex cells)
filament, which supports the anther
Natural Sciences - Grade 7
Natural Sciences - Grade 7
Natural Sciences - Grade 7

6. Female structures of a flower
Female parts are called pistils.
They consist of:
stigma for receiving pollen
style
ovary for producing ova (female sex cells)
Natural Sciences - Grade 7
Natural Sciences - Grade 7
Natural Sciences - Grade 7

7. Petals
They are often brightly coloured to attract animals for pollination.
Natural Sciences - Grade 7
Natural Sciences - Grade 7
Natural Sciences - Grade 7

8. Sepals leaf-like and green found below the petals
protect the flower bud
Natural Sciences - Grade 7
Natural Sciences - Grade 7
Natural Sciences - Grade 7

9. Can you name the parts? Natural Sciences - Grade 7
Go through this slide slowly FIRST on your own and then let the learners say the correct name for each part before moving onto the next part of the flower. Labels are given in the next slide.
Natural Sciences - Grade 7
Natural Sciences - Grade 7

10. Can you name the parts? STIGMA PETALS PISTIL (FEMALE PARTS) STYLE
STAMEN (MALE PARTS)
ANTHER
OVULE
OVARY
FILAMENT
SEPAL
RECEPTACLE
PEDUNCLE (flower stalk)
Natural Sciences - Grade 7
Natural Sciences - Grade 7

11. Bisexual flowers
Flowers that contain both the stamens and pistil are called bisexual.
They contain both male and female parts.
Natural Sciences - Grade 7
Natural Sciences - Grade 7
Natural Sciences - Grade 7

12. Bisexual flowers Natural Sciences - Grade 7 Natural Sciences - Grade 7

13. Unisexual flowers
Flowers that only contain the stamen, is a male flower.
Flowers that contain only the pistil, is a female flower.
They are called unisexual flowers.
Natural Sciences - Grade 7
Natural Sciences - Grade 7
Natural Sciences - Grade 7