PLANT REPRODUCTION

PLANT REPRODUCTION

Angiosperms

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Heterosporus Life Cycle

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Flower Parts

Receptacle

Sepals

Petals (corolla)

Stamen

Filament

Anther

Pollen

Carpel

Stigma

Style

Ovary

Ovule 4

Carpels, Ovaries & Ovules

Positions and arrangements can

vary

May have male and female flowers

Same or different plants

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Quick Quiz: The female gametophyte

in a flower is which structure?

A) Anther

B) Carpel

C) Ovule

D) All of the above

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Quick Quiz: Which of these is a

component of a stamen?

A) Anther

B) Ovary

C) Stigma

D) Style

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Gamete Development & Fertilization

Egg development

Ovule forms in ovary

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Gamete Development & Fertilization

Egg development

Meiosis results in 4 megaspores

1 develops further,

3 degenerate

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Gamete Development & Fertilization

Egg development

Mitosis (nuclei only) results in 1 cell with 8 nuclei

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Gamete Development & Fertilization

Egg development

Divides into 7 cell embryo sac (female gametophyte)

2 nuclei form

endosperm

6 nuclei each form

individual cells

(1 egg)

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Gamete Development & Fertilization

Sperm development

Spore producing cells form in

pollen sac (anther)

Meiosis results in 4

microspores

Mitosis results in 2-celled pollen

grains (male gametophyte)

One cell will form 2 sperm

nuclei

One cell will form pollen tube

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Gamete Development & Fertilization

Fertilization

Pollen lands on stigma

Pollen tube forms down style

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Gamete Development & Fertilization

Fertilization

Sperm nuclei migrate

toward egg for double

fertilization

1 sperm fertilizes egg

embryo

1 sperm fertilizes

endosperm food

source

Fertilized embryo & seed coat

form to becomes a seed

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Quick Quiz: In double fertilization, one

sperm fertilizes the egg, and the other

sperm fertilizes the…

A) Zygote

B) Endosperm

C) Ovule

D) All of the above

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Classifying Seeds & Fruits

Catagorized by…

Origin

Simple fruits

Aggregate fruits

Multiple fruits

Which tissues make up the fruit

True fruits

Accessory fruits

Composition of the fruit

Dry fruits

Fleshy (juicy) fruits 16

Simple Fruits

Develop from one or fused carpels of one flower

E.g., cherries, peaches, plums, apples

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Aggregate Fruits

Develop from many unfused carpels of one

flower

E.g., raspberries, blackberries

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Multiple Fruits

Develop from multiple flowers that fuse into a

single body

E.g., pineapple

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Fruit Tissues

True fruits

Flesh derived from the ovary

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Fruit Tissues

Accessory fruits

Flesh derived from other floral parts (receptacle)

E.g., apple, strawberry

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Fruit Composition

Dry fruits

Beans, peas, acorns, sunflowers

Fleshy fruits

Tomato, grape, orange, peach, cherry

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Dry or fleshy?

Quick Quiz: A pineapple is an example

of a _________ fruit because it forms

from many flowers’ carpels fusing

together.

A) Aggregate

B) True

C) Dry

D) Multiple

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Quick Quiz: True or false: A pinecone

is a pine tree’s fruit.

A) True

B) False

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Asexual Reproduction

Runners

New shoots from above ground stems

Strawberries

Rhizomes & cormes

New shoots from below ground stems

Grasses, aspen

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Quaking Aspen

47,000 genetically identical shoots (262 acres)

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Asexual Reproduction

Tubers

New shoots from underground tubers

Potato

Bulbs

New bulbs from existing underground bulbs

Daffodils, tulips

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Asexual Reproduction

Parthenogenesis

Embryo develops from unfertilized egg

Roses, oranges

Vegetative propagation

New plant develops from tissue (ex., leaf) that drops

from the parent plant

African violet

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Quick Quiz: True or False: When plants

reproduce asexually, the new plant is

genetically identical to the original

plant.

A) True

B) False

C) All of the above

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