Natural Sciences Grade 7 Term 1 Life and
- Slides: 12
Natural Sciences Grade 7 Term 1: Life and Living Sexual Reproduction in Angiosperms (PPT 3)
Topic 3 Sexual Reproduction Fertilisation Natural Sciences – Grade 7
Fertilisation occurs when a male sex cell joins with a female sex cell to start the growth of a new individual. Natural Sciences - Grade 7
Fertilisation • Every pollen contains 2 male sex cells. • The ovule contains the female sex cell (egg). Natural Sciences - Grade 7
Fertilisation Natural Sciences - Grade 7
Natural Sciences - Grade 7
Fertilisation Natural Sciences - Grade 7
Fertilisation Natural Sciences - Grade 7
Fertilisation • The ovule becomes the seed and the tissue around it becomes the seed coat. • The flower then loses its petals, sepals, stamens and the upper part of the pistil. • As the seed develops, the ovary enlarges and becomes a fruit. Natural Sciences - Grade 7
Fertilisation Natural Sciences - Grade 7
Fruits with seeds • The fruit becomes ripe and is ready to eat. • The seeds develop a pip around it, which gets thrown away after the fruit has been eaten. • Some animals eat the fruit and the pip. The seed is excreted in the droppings. • The seed will germinate when conditions are right. Natural Sciences - Grade 7
Fertilized ovule becomes the seed inside the fruit. Natural Sciences - Grade 7
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