Plant-reproduction Power Point

7/31/2019 Plant-reproduction Power Point

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ClickBiologyClickBiology

Plant Reproduction

Click to Enter


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INSTRUCTIONS

Ensure that you complete all activities and worksheets when instructed to do so.

The pad icon will indicate when you should fill in your worksheet.

Work your way through the presentation by clicking on the background to moveto the next page or to activate an animation. The mouse icon will indicate that aclick will activate an animation or require buttons to be pressed in the quizzes.

You can navigate around the presentation by using the arrow links that appearwhen you place your cursor on the lower left hand part of the screen.

Some slides have embedded movies which will start when you click on theimage. The video camera symbol tells you when a movie is available. There issound so you may want to wear headphones if people are working near you.

You can return to the home page by clicking on the clickbiology icon.

At the end of the module there is a test that will provide a results page which youwill print off and hand in to your teacher.

The speaker symbol means that there are some audio explanation available forthe slide



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Plant Reproduction Home Page

Flower structure

Pollination

Fruit development

Seed dispersal

Germination

Test

1

2

3

4

5

6


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Flowers are the reproductive organs of plants

Flower Structure Pollination Fertilisation Seed Dispersal Germination Test


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Click image to view a video on plant reproduction


If the hyperlink does not work then copy and paste this url into a new browser

window and you can watch the video then, url:

http://vimeo.com/1594037?pg=embed&sec=1594037
http://vimeo.com/1594037?pg=embed&sec=1594037


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Use the diagram below to complete the labels on

the flower structure worksheet

stigma

style

ovary

ovule

carpel

anther

filament

stamen

petal

sepal

receptaclepeduncle

Flower Structure Pollination Fruit Development Seed Dispersal Germination Test


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Complete the functions table by clicking on the

labels to discover their functions

stigma

style

ovary

ovule

carpel

anther

filament

stamen

petal

sepal

receptaclepeduncle



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Flower Structure Quiz

What is the name of the structure labelled X in thediagram?

sepal

stamen

peduncle

carpel

X


Click the correct answer


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Where is pollen made?

stigma

sepal

anther

ovary



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Where is the ovule found in a flower?

petals

style

nectary

ovary



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Which parts of the flower are labelled below:

X = filament, Y = anther

X

Y

X = stigma, Y = style

X = anther, Y = filament

X = style, Y = stigma



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Pollination

The pollen grain contains the male sex cell (gamete)



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Pollination is the transfer of pollen from the anther

to the stigma

This is an example ofcross-pollination as thepollen travels from one flower to a different flower.This is desirable in plants as it promotes variation.


Click to view the animation


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Pollen can be carried between flowers by insects

or by wind

Use the information in the next two slides tocomplete the table comparing the adaptations of

wind and insect pollinated flowers.



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Insect-pollinated flowers are adapted to attract

insects to them to enable transfer of pollen

Sticky stigma

to collect pollenBrightly

coloured petals

nectar and a

scent present

Pollen hasbarbs for

hooking onto

insect fur

Anthers positioned

to rub pollen onto

insects


Wi d lli d fl diff i


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Wind-pollinated flowers are different in structure

because they do not have to attract insects to

them but do need to be exposed to the wind.

Petals are small

and green as there

is no need to attract

insects

Stigma are

feathery to catch

pollen carried on

wind

Anthers are exposed to the

wind so that pollen can

easily be blown away

Pollen grains are very

small and light. They

occur in very large

numbers

No scent or nectary



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Self-pollination occurs when pollen falls from the

anther onto the stigma of the same flower

Self-pollination isnot desirable as it

reduces variation

Click to showanimation of self-pollination



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Flowers will prevent self-pollination by either

having stigma above stamen or



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by having stamen and stigma mature at different

times.

Complete the sections in your worksheet describing self-pollination and cross-pollination. Explain the mechanismsemployed by plants to prevent self-pollination.



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Click on the icons below to view the

summary videos on pollination


Pollination (9 minutes)

Insect pollination (1 minute)

If the hyperlink does not work then copy and paste

this url into a new browser window and you can

watch the video then, url:

http://www.youtube.com/watch?v=bZ3J4UWwd2Q

If the hyperlink does not work then copy and pastethis url into a new browser window and you can

watch the video then, url:

http://www.youtube.com/watch?v=ge3EM8AERV0
http://www.youtube.com/watch?v=bZ3J4UWwd2Qhttp://www.youtube.com/watch?v=ge3EM8AERV0http://www.youtube.com/watch?v=bZ3J4UWwd2Q


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Pollination Quiz

Pollination is the transfer from.?

the stigma to anther

style to stamen

anther to stigma

ovule to filament




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Pollination Quiz

The two mechanisms for pollination are?

Wind and water

Insect and water

Insect and wind

Wind and birds



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Pollination Quiz

Cross-pollination

Increases variation

Decreases variation

Is only performed by wind

Is only performed by insects



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Pollination Quiz

Flowers are adapted for wind-pollination by

Having feathery stigmas

Having a nectary

Having bright petals and a scent

Having sticky stigmas



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Fertilisation and Fruit Development



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Once pollination occurs a tube grows from the

pollen grain down through the style to the ovule


stigma

style

ovary

ovule

carpel

Note: Petals not shown in

order to simplify diagram

Click to view the

animation


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Fertilisation occurs when the male gamete

fuses with the ovule (the female gamete)

Complete the

fertilisation

section of the

worksheet

(you will need to

refer to your text

book)


Click to view the

animation

W t h thi h t i t d t id t i


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Watch this short introductory video to review

fertilisation (1 minute)

If the hyperlink does not work then copy and paste this url into a new browser

window and you can watch the video then, url:

http://www.youtube.com/watch?v=pVhH2GPlckE
http://www.youtube.com/watch?v=pVhH2GPlckE


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Seed Dispersal


W t h th id d di l


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Watch the video on seed dispersal

(lasts just under 10 minutes)

If the hyperlink does not work then copy and paste this url into a new

browser window and you can watch the video then, url:

http://www.youtube.com/watch?v=zbQ1jWl3AOM

After fertilisation the petals stamen and sepals fall off
http://www.youtube.com/watch?v=zbQ1jWl3AOM


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After fertilisation the petals, stamen and sepals fall off.

The ovule turns into a seed, the fertilised egg inside

develops into an embryo plant.

Testa:

tough seed coat

Micropyle:

Hole made by

pollen tubeEmbryo

plant

Cotyledon:

Food store

Plumule:

Embryo shoot

Radicle:Embryo root



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Water leaves the seed, it dehydrates and becomes

dormant because metabolic reactions stop.

The ovary develops to become a fruit.

seed

Fleshy wall

of the ovary

(yes, you are

eating anadapted ovary

when you

crunch into an

apple!


S d d t b di d f th t


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Seeds need to be dispersed away from the parent

plant in order to reduce competition for space,

light, nutrients and water.

Seeds can be dispersed by:

Wind

Water

Mechanical

Animals

Fill in the worksheet on the reasons and mechanisms

for seed dispersal
http://videos.howstuffworks.com/hsw/8341-forests-and-seeds-how-seeds-disperse-video.htm


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Seed dispersal quiz

Which mechanism for dispersal is used by the seedshown in the picture

mechanical

wind

animal

water


http://videos.howstuffworks.com/hsw/8341-forests-and-seeds-how-seeds-disperse-video.htm


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Seed dispersal quiz


water

animal

wind

mechanical




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Seed dispersal quiz


wind

mechanical

animal

water




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Seed dispersal quiz


mechanical

animal

wind

water




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Germination


The seed contains the embryo plant and


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Water enters the seedthrough the micropyle

and activates enzymes.

The water also softens

the testa to allow it to

split.


The seed contains the embryo plant and

cotyledons (starch stores)

Plumule

(embryo shoot)

Radicle

(embryo root)

Micropyle

Testa

Cotyledon

Label the diagramof the seed


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Enzymes are used in seed germination

starch

embryo plant

amylase

secreted

maltose

The enzymes break

starch down into

maltose and then

glucose. The glucose

is used in respirationto provide energy for

growth

Plumule

Radicle

This is the first part

to grow out of the

seed as it needs to

absorb more water


Whilst germinating the plant uses food stores in


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Whilst germinating the plant uses food stores in

the cotyledon to provide energy for growth


light

soil

germination

Plant growth and development

The seedling can nowphotosynthesise and

make its own food


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Changes in dry mass of the germinating seed:

Seed loses weight as it uses

up starch stores in thecotyledons as the seedling

cannot photosynthesise yet


Days

Dry mass/g

Dry mass is the

mass of solid

matter with allwater removed

Weight increases as

the seedling can

photosynthesise and

plant grows

Answer the

question on theworksheet

Click to

listen to an

explanation

Conditions required for germination


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Conditions required for germination

Summarise the findings of the experiment shown below:


4oC

A

moist moist moist moistdry

Warm

BWarm

CWarm

D

Warm

E

Oxygen

present

Oxygen

present

Oxygen

present

Oxygen

present

No

oxygen

No light

Pyrogallol (absorbs oxygen)Click to

listen to an

explanation


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END

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Plant-reproduction Power Point

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