A game of attraction

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 1

Welcome everybody!

Today:

Discussing exercises

Explanation about paragraph 6.6 (page 165)

Making exercises

Flower of the week: Fluitekruid

What are we going to learn today?

Today we are going to learn: 

What pollination is. 

How other species help pollination of plants. 

Repeating last lesson

Sexes of plants

Flowers have often male (stamen) and female (carpel) parts. When they have just one of them, they are called imperfect flowers. Flowers that do have both are called perfect flowers. 

Monoecious plants have both male and female imperfect flowers. Dicoecious plants have just one sex, so these imperfect flowers are all the same. 

Pollination

Because plants can't move they have different means to bring the pollen to the egg cell. One step in this process is called pollination. Pollination happens when the pollen land on the stigma of the pistil. 

Pollination

A plant can pollinate itself (self pollination) or another plant (cross pollination). 

Cross pollination is always better, but a plant is dependent on other species/environment for that. 

Insect flowers

Insect play a very important role in the reproduction of plants. Every plant with nicely colored flowers try to attract insects because they need them for that. Insects find nectar beneath the ovary's which they use as food. In the process of collecting nectar, pollen stick on them. When they get to the next flower, the pollen stick to the stigma of the carpel. 

Pollination by insects 

Pollination by other animals

Pollination by wind

Wind pollinated plants spread their pollen through wind. The flowers look a lot different with the stamen hanging outside the flowers and the carpels having a feathery look. People with hay fever are allergic to the pollen of wind pollinated plants. 

Get to work! 

The homework for next lesson will be the exercises of paragraph 6.6. You can start working on them now.