Recap 7.1-7.3

• Biologie
• Middelbare school
• havo
• Leerjaar 2

Recap

one device per group 

root

stem

flower

leaf

fruit

What is the function of a flower?

1. For reproduction
2. For photosynthesis
3. For transportation
4. For looking pretty

What is the function of the calyx (sepals)?

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

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

anther

filament

petal

sepal

stigma

style

ovary

nectary

What is self-pollination

What is cross pollination?

1. Pollination in the same flower
2. When insects spread pollen
3. Pollen go brrr
4. Pollination between different flowers

What type of pollination is nr I?

1. Number I is self pollination
2. Number I is cross pollination
3. Number I is no pollination

What type of pollination is nr II?

1. Number II is self pollination
2. Number II is cross pollination
3. Number II is no pollination

What type of pollination is nr III?

1. Number III is self pollination
2. Number III is cross pollination
3. Number III is no pollination

What type of pollination is nr IV?

1. Number IV is self pollination
2. Number IV is cross pollination
3. Number IV is no pollination

Pollination

Self-pollination

Cross-pollination

No pollination

Number 1

Number 2

Number 3

Number 4

Pollination

Self-pollination

Cross-pollination

No pollination

Number 1

Number 2

Number 3

Number 4

Which flower spreads their pollen by wind or insects?

Draw and explain the three steps of fertilization

FERTILIZATION

• THE POLLEN GRAIN LANDS ON THE STIGMA
• THE POLLEN  FORMS A TUBE AND THE NUCLEUS GOES DOWN  THE STYLE
• THE POLLEN NUCLEUS MELTS TOGETHER WITH THE EGG NUCLEUS IN THE OVULE TO FORM A SEED.

What happens after fertilization?

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

Animals eat the flesh and excrete the seeds

The fruits are provides with hooks or barbs

Seed dispersal: animals

Scattered by the plant itself

Seed dispersal

Dispersal of fruits and seeds

• Plants disperse the seeds themselves by ejecting the seeds over a distance 
• Seeds are dispersed by wind
• Seeds are dispersed by animals and humans 

time to work 

first you do the worksheet

6.2 and 6.3 

do exc. 1,2.4.5.7.8