Figure 38 2 review of an idealized flower
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Figure 38.2 Review of an idealized flower. Pistil. Objective: You will be able to identify and give the function of the parts of a flower. Do Now: Read pages 612 and 613 For each part of the flower, write its function This will take you a few minutes. Male parts.

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Figure 38.2 Review of an idealized flower

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Figure 38 2 review of an idealized flower

Figure 38.2 Review of an idealized flower

Pistil


Objective you will be able to identify and give the function of the parts of a flower

Objective:You will be able to identify and give the function of the parts of a flower.

Do Now:

  • Read pages 612 and 613

  • For each part of the flower, write its function

  • This will take you a few minutes


Male parts

Male parts

  • Male part is called the stamen

  • The stamen consist of the anther and filament

  • Anther

    • Carries out meiosis to make pollen

    • Sperm cells are inside the pollen

  • Filament

    • Holds the anther into the air


Female parts

Female parts

  • Female part is called the pistil

  • The pistil is made of the stigma, style and ovary

  • Stigma is sticky to capture the pollen

  • Style is a passageway to the ovary

  • Ovary

    • Carries out meiosis to make eggs

    • The eggs are found within ovules


Objective you will be able to describe the events of pollination and fertilization

Objective:You will be able to describe the events of pollination and fertilization.

Do Now:

  • Read page 616

  • What two things form from fertilization?


Figure 38 5 pollen grains have tough ornate and distinctive walls

Figure 38.5 Pollen grains have tough, ornate, and distinctive walls


Pollination

Pollination

  • Pollination is the transfer of the pollen from the anther to the stigma

  • If the pollen lands on a flower on the SAME plant it is called self-pollination

    • If it lands on a different individual then it is called cross-pollination

  • Pollinators are used to move the pollen


Figure 38 3d1 pollination modes

Figure 38.3d1 Pollination modes


Figure 38 1 simplified overview of angiosperm life cycle

Figure 38.1 Simplified overview of angiosperm life cycle


Fertilization

Fertilization

  • Fertilization occurs within the ovule

  • There are actually two sperm cells

  • The first will fertilize the egg and form a zygote

    • This zygote will undergo cleavage to from an embryo


Fertilization1

Fertilization

  • The second sperm will fertilize a 2n cell and form a 3n cell called the endosperm

    • The endosperm is the food source for the embryo

  • This concept of two fertilizations is called double fertilization

  • It is unique to flowering plants.


After fertilization

After Fertilization

  • The ovule itself will harden and become a seed

  • The ovary itself will change and become a fruit

    • The fruit is used for seed dispersal


Figure 38 12 development of a pea fruit pod

Figure 38.12 Development of a pea fruit (pod)


Objective you will be able to identify and describe the parts of a seed

Objective:You will be able to identify and describe the parts of a seed.

Do Now:

  • Read page 618

  • Give examples of fruits that everyone thinks are vegetables.


Figure 38 11 seed structure

Figure 38.11 Seed structure


Seed structure

Seed Structure

  • The embryo consists of the hypocotyl and the epicotyl

    • Hypocotyl becomes the root

    • Epicotyl becomes the leaves and upper part of stem

  • Cotyledon is used as a food source

  • The seed coat protects the seed


Seed germination

Seed germination

  • Once proper conditions are met, the seed will start to germinate.

  • Seed germination depends on water, oxygen and temperature

  • Why not light?


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