6.7 dispersal of fruits and seeds

• Biologie
• Middelbare school
• havo
• Leerjaar 1

6.7 dispersal of fruits and seeds 

Programma:

1. Uitleg Basisstof 6.7 
2. Hw maken en jezelf nakijken 
   
3. Waar vind je de oefentoetsen? 

How are your
potato-offshoot(s) doing?

How can seeds be
dispersed (=spread out)?

6.7 dispersal of fruits and seeds

By the plant itself

• Shoots or slings them away when they are ripe 
  

Cranesbill

trough tasty and nutricious
*fruit pulp

small hooks 

or sticky coating

by animals

or by forgetting!?

???

www.britannica.com

Dispersal by the wind 

Maple tree

Linden

Dandelion

Dispersal by water

Why is it so important that plants disperse their seeds?

6.7 dispersal of
fruits and seeds

Read pages 212-214

& make assignments 1, 2 en 3

ready? work on potato research report.  (write introduction using basic 6.5) 

Or make summaries of basics 1-4 + 7

Photosynthesis

Sunlight

Carbondioxide

Glucose

Oxygen

Water

roots provide support and uptake of nutrients

water uptake

seed development

making food: photosynthesis

mineral uptake

provide support

Photosynthesis

root

stem

flower

leaf

fruit

ROOTS

STEMS & LEAVES

FLOWERS

FRUITS 

Put the right word at the right picture

Pollination

Seedling

Seed

Germination

Fruits

Put the events in the right order

1

2

3

4

5

6

7

8

ovary becomes fruit

egg cell becomes plant embryo

ovule becomes seed

pollination

pollen is taken to a flower

fertilization

pollen makes pollen tube

pollen is made

Which mechanism for dispersal is used by the seed shown in the picture?

1. The plant itself
2. Animals
3. The wind

Which mechanism for dispersal is used by the seed shown in the picture?

1. The plant itself
2. Animals
3. The wind

The native North Americans called this plant ‘white man’s footsteps’ because these plants grew where the colonists walked. What kind of seeds do these plants have?

1. Big seeds
2. Light weight seeds
3. Seeds with fluffs
4. Sticky seeds

What is the function of the fruit around the seeds?

1. protection of the seeds
2. dispersal of the seeds
3. nutrition for seed development
4. all are true

How is this coconut seed dispersed?

1. by animals
2. by the wind
3. by water
4. not at all

Structure of flower

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

STYLE

PETAL

Carpel

ANTHER

SEPAL

OVARY

STIGMA

STAMEN

FILAMENT

GROWTH

Germination

Pollination

Fertilisation

Seed formation

Seed dispersal

Protects the seed.

Contains a food reserve. 

The start of a new plant.

The seeds absorbs water through this.

Plant embryo.

Pore.

Seed coat.

Seed leaves.

wind pollinated flower

insect pollinated flower

Pollination: transferring pollen from stamen to stigma.

Pollen grains do then have to get onto the stigma of the flower of the same plant species!

Insect-pollinated flowers

• Large and colorful petals, 
• Produces nectar & scent
• Small amount of pollen

Wind-pollinated flowers

• Flowers small and not colorful, 
• Produce large amount of pollen, 
• Anthers often hang out of flower, 
• Stigma's large and feathery.