Natural Sciences Grade 7 Term 1: Life and Living Sexual Reproduction (Part 1) (PPT 1)
Topic 3 Sexual Reproduction Sexual Reproduction in Angiosperms Natural Sciences – Grade 7
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
Structure of a flower Natural Sciences - Grade 7
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
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
Petals They are often brightly coloured to attract animals for pollination. Natural Sciences - Grade 7 Natural Sciences - Grade 7 Natural Sciences - Grade 7
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
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
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
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
Bisexual flowers Natural Sciences - Grade 7 Natural Sciences - Grade 7
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