6.2 pollination

• Biologie
• Middelbare school
• mavo
• Leerjaar 1

start task: 3.2 pollination

1. Copy the learning goals.

2. Start reading: pp 171-172

Learning goals: After this lesson, you can

- describe what pollination is and what the difference is between cross-pollination and self-pollination

- compare wind-pollinated flowers with insect-pollinated flowers

- <img src="https://cdn.creazilla.com/cliparts/1556229/silent-reading-clipart-xl.png" alt="Silent reading - Free vector clipart images on creazilla.com"/>

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Learning goals: After this lesson, you can

- describe what pollination is and what the difference is between cross-pollination and self-pollination

- compare wind-pollinated flowers with insect-pollinated flowers

- <img src="https://cdn.creazilla.com/cliparts/1556229/silent-reading-clipart-xl.png" alt="Silent reading - Free vector clipart images on creazilla.com"/>

sepals & nectary

style

anther

petal

What is the function of the calyx (sepals)?

1. attract insects
2. reproduction
3. protection against cold
4. producing pollen

What is the male sex organ of a plant? And the female sex organ?

1. female: carpel male: petal
2. female: petal male: sepal
3. female: stamen male: carpel
4. female: carpel male: stamen

Stamen

petal

sepal

Carpel

This flower has .... stamens

1. 1
2. 5
3. 8
4. 4

The flower in the picture has ... carpel(s)

1. 1
2. 2
3. 3
4. 4

The flower in the picture has .. visible petal(s)

1. 1
2. 2
3. 3
4. 4

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Get your zuidschrift and pen ready to take notes.

Structure of flowers

Even though there are many different flowers, most of them have the same parts.

• Stamen: male reproductive organ
• Pollen: male sex cells

• Carpel: female reproductive organ

(stigma, style, ovary)

• Egg cell: female sex cell

Pollination = transfer of pollen grains from an anther to a stigma of a flower of the same species 

self-pollination = same plant;    cross-'' is with another plant 

Insect pollination

Wind pollination

Wind pollination

• Flowers are small and inconspicuously*coloured
  - Stamen hanging out in the wind
  - Stigma's large and feather shaped*
• Don't produce nectar
• Pollen grains are very light & small

(mostly grasses and trees)

hay fever?

Pollination by animals

Pollination by animals
(insectflowers) 

- large and strikingly* coloured petals (UV)

- scent and nectar.

- sticky pollen grains

insect-pollinated flowers

Wind-pollinated flowers

insect-pollinated flowers

Wind-pollinated flowers

green petals

nectar

Stamen inside the flower

Produce a lot of pollen

Scent

Brightly coloured petals

Sticky pollen

Which numbers indicate
self-pollination?

1. 1
2. 1 and 4
3. 1 and 3
4. 1,2,3

Number 4 is...

1. Cross-pollination
2. Self-pollination
3. No pollination

Number 7 is...

1. Cross-pollination
2. Self-pollination
3. No pollination

Number 8 is...

1. Cross-pollination
2. Self-pollination
3. No pollination

Wat	Maak opdrachten 1 t/m 8 blz 177-180
Hoe
Hulp	.
Klaar?	Test jezelf + flitskaarten in Bvj online.

1) boek: tekst en afbeeldingen van blz. 175-177 

2) buur  

3 ) docent

Je mag fluisterend samenwerken met je buur. 

Gesprekken gaan alleen over de opdrachten.

Leerdoelen: Na deze les kun je:

- uitleggen wat bestuiving is

- vertellen wat de verschillen zijn tussen insectenbloemen en windbloemen

Perfect flower(s)

= both sexes

Imperfect flower(s)

= one sex per flower

cross-pollination

self-pollination

male part

female part

carpel

stamen

Insect-pollinated flowers

Wind-pollinated flowers

The petals are coloured 

The petals are small and green

The flowers have nectar and are scented

The flowers don't have nectar

Pollen sacs are outside the flower

Pollen sacs are inside the flower

Stigma is usually inside the flower

Stigma is usually outside the flower

Stigma are feathery (geveerde vorm)

pollen grains are rough and sticky

Pollen grains are smooth and light

1 till 8 :  succesful or unsuccesful pollination? 

Number 1 is...

1. Cross-pollination
2. Self-pollination
3. Geen bestuiving

Number 2 is...

1. Cross-pollination
2. Self-pollination
3. No pollination

Number 3 is...

1. Cross-pollination
2. Self-pollination
3. No pollination

Number 5 is...

1. Cross-pollination
2. Self-pollination
3. No pollination

Number 6 is...

1. Cross-pollination
2. Self-pollination
3. No pollination

After fertilisation

• A germ/plant embryo develops from the fertilised egg cell  
• The ovule develops into  seeds 
• The ovary grows into fruit containing more seeds 
  

pod

flower stalk

sepal

ovary

stamen

petal

ovule

wind pollinated flower

insect pollinated flower