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The flower is the reproductive structure of higher plants.

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Presentation on theme: "The flower is the reproductive structure of higher plants."— Presentation transcript:

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3 The flower is the reproductive structure of higher plants.

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5 Most flowers have 4 basic parts. petals sepals pistil stamen

6 Some floral structures are nonessential; they are not required for reproduction. petals sepals leaf-like structures which protect the flower before blooming colorful, protect reproductive structures, attract pollinators

7 Some floral structures are essential for reproduction to occur. female organ, produces egg(s) male organs, produce sperm in pollen grains pistil stamens

8 anther filament produces pollen Stamens ( ) are made of 2 parts.

9 stigma style ovary produces egg(s) Pistils ( ) are made of 3 parts.

10 Inside every pollen grain are two sperm cells.

11 Identify the structures in this flower. stigma style pistil anther filament stamen petal Where is the ovary? Where are the sepals?

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13 When pollen lands on the stigma, this process is called pollination. A pollen tube grows from the pollen grain and the sperm migrate to the egg. The first sperm fertilizes the egg. The egg and sperm unite in a process called fertilization.

14 There are 2 types of pollination. When pollen lands on a stigma of the same flower, this is self-pollination.

15 When pollen lands on a stigma of another flower, this is cross-pollination.

16 Agents of pollination include insects, birds, and wind.

17 The egg and sperm unite in a process called fertilization. The two cells (egg and sperm) become one new cell called a zygote. The zygote begins to grow and develops into a seed. zygote

18 As the seed develops, the ovary grows into a fruit. This means that anything you eat with a seed(s) is a ripened ovary.

19 Examples of ripened ovaries.

20 Which of these are fruits (ripened ovaries)? Hint: If it has a seed, its a fruit.

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22 Some flowers have guide lines to help pollinators find their way inside.


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