2.6. A game of attraction - lesson 1

• Biologie
• Middelbare school
• vmbo t, mavo, havo
• Leerjaar 1

Today

• Repeat 2.5. 
• 2.6. A game of attraction

What is the main function
of flowers?

Which part of the flower protects the flower when its inside the bud?

1. stamen
2. sepals
3. petals
4. carpel

Which part of the flower are the female reproductive parts?

1. stamen
2. sepals
3. petals
4. carpel

2.6. A game of attraction

• Page 46 + 47 in your textbook
• For sexual reproduction male sex cells and female sex cells are needed.

How do we call the male
sex cells of a plant?

How do we call the female
sex cells of a plant?

2.6. A game of attraction

• Page 46 + 47 in your textbook
• For sexual reproduction male sex cells and female sex cells are needed.
• Pollen grains (male sex cells) are in the anther at the top of the stamen.

2.6. A game of attraction

• Page 46 + 47 in your textbook
• For sexual reproduction male

       sex cells and female sex cells

       are needed.

• Pollen grains (male sex cells) are in the anther at the top of the stamen.
• Egg cells are in the ovary of the carpel, inside the ovules.

2.6. A game of attraction

• Flowers which have both male (stamen) parts and female (parts) are called perfect flowers. 

2.6. A game of attraction

• Flowers which have both male (stamen) parts and female (parts) are called perfect flowers. 
• Plants which have separate male and female flowers are called imperfect flowers. 

2.6. A game of attraction

• Plants have to make use of pollinators to carry pollen from one flower to another. 

Give an example of a pollinator.

2.6. A game of attraction

• Plants have to make use of pollinators to carry pollen from one flower to another. 
• Examples of pollinators: insects, other animals or the wind. 

2.6. A game of attraction

• Plants have to make use of pollinators to carry pollen from one flower to another. 
• Examples of pollinators: insects, other animals or the wind. 

2.6. A game of attraction

• When pollen grains land on the stigma of a carpel, this is called pollinination (bestuiving). 
• There are two types of pollination:
• 1. Self-pollination (zelfbestuiving) - This is when flowers pollinate themselves or another flower on the same plant. 

2.6. A game of attraction

• When pollen grains land on the stigma of a carpel, this is called pollinination (bestuiving). 
• There are two types of pollination:
• 1. Self-pollination (zelfbestuiving) - This is when flowers pollinate themselves or another flower on the same plant. 
• 2. Cross-pollination (kruisbestuiving) - This occurs when pollen is transferred from flowers on one plant to flowers of a different plant of the same species. 

2.6. A game of attraction

• Flowers that depend on insects  for pollination have to attract them. 

How do flowers attract
insects?

2.6. A game of attraction

• Flowers that depend on insects  for pollination have to attract them. 
• Flowers attract insects with their brightly coloured petals and attractive smell. 
• Inside the flower the insect will find nectar.
• The nectar in flowers lures other animals as well; bats and birds such as hummingbirds are especially attracted to nectar.

2.6. A game of attraction

• There are also flowers which do not produce nectar, do not have attractive smells and do not have colourful petals. 
• They depend on the wind to transport their pollen grains. 

HOMEWORK

- Make the excercises from 2.6  a game of attraction

OR

- Make flashcards of the bold words!