Lesson 7.2.2: Gymnosperm & Angiosperm Reproduction

Lesson 7.2.2: Gymnosperm and Angiosperm Reproduction

Multiple Choice

The leaf’s cuticle

• stores water.

• reduces evaporation.

• transports water in the leaf.

• absorbs water for the leaf.

Multiple Choice

The product of the union of a sperm and egg is called a(n)

• Embryo

• Gametophyte

• Fruit

• Zygote

Dropdown

A maple tree lives for many years and is an example of a ​

Select answer

plant.

Multiple Choice

This is the name for the movement of seeds from one location to another

• Transpiration

• Dispersal

• Pollination

• Fertilization

Multiple Choice

An offspring that is the result of asexual reproduction

• has two parents.

• developed from a zygote.

• inherited genes from two parents.

• is genetically identical to its parent.

Lesson Objectives

• Discuss the reproductive process in Gymnosperms

• Discuss the reproductive process in Angiosperms

• Discuss different types of fruit

Gymnosperms

• The reproductive structure of most gymnosperms is the cone

• There are two types of cones

  • Male

  • Female:

• Some species produce both types, but some only have one type per plant

Ohio Grade 8 Science | Lesson 7.2

Gymnosperms: Male Cones

• Male cones produce pollen

• Tend to be smaller, and bunched together on a branch

Ohio Grade 8 Science | Lesson 7.2

Gymnosperms: Female Cones

• Female cones contain ovules

  • Ovule: Structure that contains an egg cell

• There is at least one ovule at the base of each scale

  • Two egg cells form in each ovule on the female cone

Ohio Grade 8 Science | Lesson 7.2

Gymnosperm Pollination

• Wind carries pollen from the male cone to the female cone

• Each Ovule produces a glue-like substance to catch the pollen and keep it from blowing away

Ohio Grade 8 Science | Lesson 7.2

Gymnosperm Fertilization & Seed Development

• After Pollen is collected, the ovule closes and traps the pollen

  • Scales also close to keep the zygote safe

• Female cones remain on the tree until fully mature

  • Can take up to two years

  • Cones grow in size as they mature

• Male cones fall of the tree once they run out of pollen

Ohio Grade 8 Science | Lesson 7.2

Gymnosperm Seed Dispersal

• Once the seeds fully mature, the female cones open back up

• Wind shakes the cones and the seeds fall out

• Only a few seeds will land in a spot suitable for growth

  • Animals may move cones and seeds to new locations

Ohio Grade 8 Science | Lesson 7.2

Multiple Choice

True or False: Most Gymnosperms produce both male and female fruit.

• True

• False

Multiple Choice

True or False: The female cone of gymnosperm has scales

• True

• False

Angiosperm Reproduction

• Angiosperm reproduction involves two unique structures

  • Flower: Location where fertilization occurs

  • Fruit: Location that stores the seeds

• Pollination occurs in different ways depending on the flower

  • Animals can pollinate a flower

  • Wind can blow pollen

  • Some Pollen floats across the water

Ohio Grade 8 Science | Lesson 7.2

Angiosperm Fertilization

• When pollen lands on the stigma of a plant, it is trapped by a sticky substance called exudate

  • Pollen produces a pollen tube that grows into the ovule and sends the sperm into the egg

• Once the egg is fertilized, the ovule starts to grow the seed structures

• The rest of the ovary delevopes into a fruit

Ohio Grade 8 Science | Lesson 7.2

Fruit

• Fruit: A ripened ovary that encloses one or more seeds

  • Two Broad Categories

    • Fleshy Fruits

      • Have extra tissue surrounding the seed

        • Contains liquid

    • Dry Fruits

• Are eaten by my animals to help disperse seeds

Ohio Grade 8 Science | Lesson 7.2

Fleshy Fruits: Berries

• Have two types of soft flesh tissue with lots of seeds inside

  • Examples:

    • Raspberries

    • Tomatoes

    • Bananas

  • Strawberries are not Berries because their seeds are on the outside of the fruit

Ohio Grade 8 Science | Lesson 7.2

Fleshy Fruits: Pepo

• Have soft tissue and hard tissue surrounding multiple seeds

  • are sometimes considered a modified berry

  • Examples:

    • Squash

    • Watermelon

    • Cucumbers

Ohio Grade 8 Science | Lesson 7.2

Fleshy Fruits: Drupes

• Have soft tissue and hard tissue surrounding a single seed

  • Hard tissue is called a pit

  • Examples:

    • mangoes

    • peaches

    • plums

    • avocado

Ohio Grade 8 Science | Lesson 7.2

Fleshy Fruits: Multiple Fruits

• Multiple Ovaries fuse together to make one massive fruit

  • Examples

    • Pineapple

    • Breadfruit

    • Figs

Ohio Grade 8 Science | Lesson 7.2

Drag and Drop

​

Placeholder

occurs when a sperm cell unites with an egg cell.​

Drag these tiles and drop them in the correct blank above

Fertilization

Transpiration

Dispersion

Exulation

Multiple Choice

True or False: All fruits have multipe seeds

• True

• False

Multiple Choice

What type of Fruit is in the image

• A berry

• A pepo

• A Drupe

• A multiple Fruit

Multiple Choice

What type of Fruit is in the image

• A berry

• A pepo

• A Drupe

• A multiple Fruit