Bs 2: Pollination

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

Bs. 2 Pollination

What are we going to do today?

• Repeat bs 1 and bs 2 (10-15 min)
  
• Make exercises (20 min)
• Kahoot 

At the end of this class

...You can describe what pollination is.

...You can explain the difference between cross-pollination and self-pollination.

...You can list the features of insect-pollinated flowers and wind-pollinated flowers.

Stamen

petal

sepal

Carpel

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

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

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!

Self-pollination:

•  Pollen from stamen to stigma of the same flower,
  
• Pollen from one flower onto the stigma of another flower on the same plant,

Cross-pollination:

•  Pollen can also get onto the stigmas of flowers of a different plant (of the same species).

Insect-pollinated flowers

• Large and colorful petals, 
• Nectar, 
• 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.

What is self-pollination?

Which numbers indicate
self-pollination?

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

Insect-pollinated flower

Wind-pollinated flower

bright coloured petals

flowers are scented and contain nectar

pollen grains rough and sticky

small flowers

produce many pollen

stamen and stigma inside the flower

stigma are feathery and outside the flower

Time to work!

Make exercises below (if not finished yet):

• Bs 1: 1, 2, 3, 5
  
• Bs 2: 1, 2, 3, 5, 6 + 8

What you don't finish is homework!

Done?

• Make summary bs 1 + bs 2 @studiewijzer

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