biology lesson 3.1
TRANSCRIPT
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Chapter 3 Lesson 1
Flower – the structure of an angiosperm plant that contains the male and female reproductive organs.
Function of the flower is toProduce S E E D s!
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Where do you find a flowers?
……at the enlarged end Of the
stem called the flower stalk or pedicel.
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Parts of the flower
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Pistil- female reproductive part of the flower
Includes:1. Stigma – sticky top surface where the pollen sticks
2. Style – long tube that connects the stigma and the ovary
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3.Ovary – houses the ovules that contain the embryo. The ovary develops into the fruit that provides nutrients for the developing embryo.
4. Ovule – contains the egg cell and when fertilized contains the developing embryo. The ovule becomes the seed.
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ovules
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Stamen – male reproductive part of the flowerIncludes:1. Anther – where one finds the pollen grains
2. Pollen – contain the sperm nuclei
3. Filament – the long stalk that attaches the anther to the receptacle
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Other important parts of a flower:
1.Receptacle – the base of the flower
2. Sepals – small green leaves that house the developing bud (flower). Collectively called the calyx.
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Other important parts:
3. Pedicel – the end of the stem where the flower is found
4. Petals – colorful structures surround the reproductive parts of flower and attract insects. Collectively called corolla.
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Complete and Incomplete Flowers
Complete flowers A flower that has all of the normal flower parts, namely, the sepals, petals, stamens, and pistil.
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Complete and Incomplete Flowers
Incomplete flowers An incomplete flower is missing one of the four major parts of the flower, the stamen, pistil, petals, or sepals. Examples: the oak family, the birch family, and the walnut family
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Incomplete Flower – Beech
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Incomplete Flowers
Example: Poinsettia
lacks petals – red Is actually leaves calledBracts.
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Perfect vs. Imperfect Flowers
Perfect flowers Flower with both sexeshas both stamens and pistilsMay lack sepals or petals.
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Perfect flower
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Perfect vs. Imperfect Flowers
Imperfect flowers lack either stamens or pistils, and may or may not have sepals or petals.
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Types of Imperfect Flowers
1. Pistillate FlowerIs a female flowerHave a functional pistil, but either have no stamen at all, or have stamens with anthers that are incapable of producing pollen.
example: corn ears
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Types of Imperfect Flowers
2. Staminate Flower Is a male flower Have functional stamens capable of producing pollen, but either have no ovary at all, or an ovary which is not fertile.
Example: corn tassels
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Types of Imperfect Plants
1. Monoecious -
Said of a plant species in which all individuals bear both staminate and pistillate flowers,
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Types of Imperfect Plants1. Monoecious -
For example:Oaks—with male flowers in catkins, producing wind-borne pollen,
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Types of Imperfect Plants1. Monoecious -
For example:
Oaks—with male flowers in catkins, producing wind-borne pollen, and female flowerson the stems, producing acorns.
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Types of Imperfect Plants1. Monoecious -
Ex. Also corn –tassel = male and ear = female but
on same plant
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Types of Imperfect Plants
2. Dioecious -
said of a plant species which has some individuals which bear only staminate flowers,
and some which bear only pistillate flowers,
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Types of Imperfect Plants
2. Dioecious -
and there are no perfect flowers.
These are the species that are commonly referred to as having male and female plants.
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Flower Arrangement
Some have a single flower on each stalk like a rose.
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Most are inflorescence which have clusters of flowers.
Flower Arrangement
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1. Soil fertility2. Hormones3. Leaves4. Flowers5. Day6. Long7. Day8. Morning Glory