BS 1 tm 3

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

BS 1 tm 3

Learning goals 

bs 1 and 2

1. you must be able to name the parts of a flower and its features and functions.
   
   
2. you must be able to describe what pollination is. 
3. And you must be able to tell the difference between cross-pollination and self-pollination.
4. you must be able to list the features of insect-pollinated flowers and wind-pollinated flowers. 
   

Flowers

Corolla = petals 

Often big and colorful.  

Why is this useful for the flower?

Calyx = sepals 

Usually green. 

Why is this color useful for the flower?

Photosynthesis

Green parts of a plant can do photosynthesis = make their own food out of sunlight, so they can grow! 

Pollination - read carefully!

Self-pollination

Cross-pollination

No pollination

When pollen on the anther of a flower reaches the stigma of a flower on the same plant

When pollen from one plant reaches the stigma of a flower on another plant 

When pollen of one species (=soort) reaches the stigma of a flower of another species

Self-pollination

Cross-pollination

No pollination

Number 1

Number 2

Number 3

Number 4

Number 5

Number 6

Number 7

Number 8

Insect-pollinated flowers

Wind-pollinated flowers

The petals are colored 

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 

pollen grains are rough and sticky

Pollen grains are smooth and light

Fertilization

Fertilization is the moment that the nucleus of the pollen grain and the nucleus of the egg cell fuse (=versmelten)