Reproduction in Angiosperms - Amazon S3

Reproduction in Angiosperms - Amazon S3

Reproduction in Angiosperms Flowering Plants Angiosperms Angiosperms are flowering plants Examples: grasses, roses, elm tree, oak tree, apple tree, pansies, etc. The Flower

The part of the plant that carries out sexual reproduction is the: flower This is where seeds are produced Once the flower has served its purpose the petals fall off Structure and Function of the Flower

1. 2. 3. 4. Pistil (carpel) female reproductive organ of flower. Located in center of flower and includes the stigma, style and ovary Stigma top of the pistil enlarged area

that receives pollen Style supports the stigma Ovary located at the base of the pistil. Contains ovules Structure and Function of the Flower 5. Stamen male reproductive organs made of 2 parts 6. Filament stalk like part of stamen 7. Anther sac like structure at tip of filament.

Pollen grains are produced within the anthers. Flowers may contain one or more anthers. Structure and Function of the Flower 8. Petal can be white, green or brightly colored. Complete circle of petals is corolla. Surround reproductive organs and attract insects and animals to help with pollination 9. Sepal Leaf like structures that form a ring

around the base of the flower. Enclose and protect flower bud before it blossoms. Complete circle of sepal calyx. Can be small & green or large & brightly colored Structure and Function of the Flower 10. Receptacle large end of stalk to which other flower parts are attached 11. Pedicel connection between flower and stem

Structure and Function of the Flower The essential organs of the flower are: Stamens and pistil (carpel) Development of Gametophytes Gametophytes of a flowering plant are the:

Pollen (male) Ovules (female) They are produced by: Meiosis Pollination Pollination in

angiosperms is the transfer of pollen from the anther to a stigma of a flower. There are a number of different pollination methods: Pollination

Self-pollination pollen grains fall onto stigma of the same plant. Anthers must be located above stigma Pollination

Cross-pollination transfer of pollen from anthers of one plant to stigma of another. Wind pollen is adapted to be carried by wind so must be light, loose, have features that will carry them on the wind

Pollination Cross-pollination Water pollen is adapted to be carried by water water resistant, light buoyant Animals plants usually showy & scented to attract animals. Pollen

attaches to body of animal & is transferred to other plant Artificial pollination humans transfer pollen from one plant to another. Used in plant breeding to produce plants with specific characteristics Fertilization in Angiosperms

When a pollen grain lands on a stigma it begins to grow a pollen tube. The pollen tube grows into the style and eventually reaches the ovary and enters the ovule. Fertilization in Angiosperms

The fertilized egg becomes an embryo (baby plant) Meanwhile, the ovule is turning into a seed which encompasses the embryo and some food in the form of cotyledons

The ovary grows and becomes a fruit Asexual Reproduction Three ways to reproduce asexually

1. Leaf cutting: cut a leaf and plant it and it will grow into a plant 2. Plantlets: some plants grow runners (thin stems) that have plantlets on the end 3. Root sprouts: some trees produce shoots from their spreading root system

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