First Five

Explain the difference between each of the following pairs of words1. cell membrane, cell wall

2. osmosis, diffusion

3. enzyme, substrate

4. respiration, photosynthesis

Silently, answer the following question in your notebook:

AnnouncementsPast Due:

Plant Nutrition PacketRespiratory System PacketCirculatory System Problems

Today:Fill out Guided NotesPlant Reproduction HW is on the final page

Due next class period.

Plant Reproduction

http://www.youtube.com/watch?v=CkBNEM2mD30

Plant Reproduction

1. Get your assigned ipad2. Go to my Weebly(ctompkinsasuprep.weebly.com) Coordinated

Science II3. Click on “Classwork: Plant Reproduction”

4. Open the Powerpoint and use it to answer the questions on the handout

Plant ReproductionFlowers are the reproductive

organs of plants

Many flowers have both male and female reproductive parts

Structure of a Flower1. Pistil/Carpel

2. Stigma

3. Style

4. Ovary

5. Stamen

6. Filament

7. Anther

8. Petal

9. Sepal

10. Receptacle

11. Stem

Fem

ale R

eproductive S

tructures

Male R

eproductive S

tructures

Male Reproductive StructureThe stamen consists of

two parts: Anther and Filament

The anther is where meiosis occurs to produce haploid pollen

The filament is a stalk that supports the anther

• Pollen Grain

• Anther Sac

Female Reproductive StructureThe pistil (or carpel)

consists of the stigma, style and ovary

Meiosis occurs in the ovary to produce haploid ovules

The sticky stigma receives the pollen (male gamete structure) from the anther

The pollen grows a tube down through the style

Fertilization

After pollen lands on the stigma, a pollen tube grows down through the style to ovary

The pollen tube passes through the micropyle (opening) into the ovule

Fertilization

Male gametes travel along the pollen tube and into the ovule

The male gamete fuses with the female gamete – fertilization has taken place

Seed and Fruit Development After fertilization,

the petals and sepals fall off flower

Ovary “ripens” into a fruit

The ovule develops into a seed

Other Reproductive Structures Petals: colorful

structures that attract pollinators.

Sepals: surround and protect the flower bud.

Reflect[Write your answer on the worksheet.]

In which part of a flower are male gametes made?

In which part of a flower are female gametes made?

PollinationWind, insects or other

animals transfer pollen from the anther (male structures) of one flower to the stigma (female structures) of another

Flowers vary depending on pollination mechanism

Pollination VectorsWind Pollination: Dull, scentless flowers with reduced petalsBees/Butterfly Pollination: Brightcolor, nectars, scent. They sip nectar, get pollen on coats, transfer pollen from flower to flower

Bird Pollination: Nectars brightcolors, tube-like flowers

Moth Pollination: White petals, open at night

Fly Pollination:Rank odor, fleshcolored petals

Reflect[Write your answer on the worksheet.]

After pollination, how does the male gamete reach the ovule?

Seed Dispersal Mechanisms-Allow plants to colonize new areas and avoid

shade of parent plant

Wind Dispersal - Flight mechanisms, like parachutes, wings, etc. Ex. Dandelion, maples, birch

Animal Dispersal - Fleshy fruits which animals eat, drop undigested seeds in feces or burrs which stick to animals’ coats

Gravity Dispersal - Heavy nuts fall to ground and rollex. acorns

Water Dispersal - Plantsnear water create floating fruitsex. coconuts

Cambridge Practice Questions

Complete the Cambridge Practice Questions at the end of the handout.