Basic 6.7: Dispersal of seeds

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

Fruits and seeds

Ovary becomes the fruit

Ovules become the seeds

Fertilised egg cell becomes the plant embryo

Which flower(s) can grow a fruit?

1. Flower X
2. Flower Y
3. Both
4. None of the two

In which case do we eat the fruit of a plant?

1. Tomato
2. Brown bean
3. Peanut

Here you see a green bean with its seeds. How many pollen grains were needed for this bean? Explain your answer.

In the picture you can see a pepper. Does this pepper have plant embryo's? Explain your answer.

How many fruits can grow from this flower?

1. 1
2. 7
3. 0
4. Impossible to tell

Basic 5: dispersal of seeds

Seeds can disperse through three different ways:

1. Through the wind
2. Through animals
3. Through themselves
   

Wind dispersal

Seeds are dispersed / spread through wind

• Light
• Wings / fluffs
  

Animal dispersal

• Small hooks
  
• Fruit pulp
  

Dispersal by plants themselves

• Fruits burst open
  

How is this seed dispersed? Explain your answer.

This fruit does not have fruit pulp. Why?

The native North Americans called this plant ‘white man’s footsteps’ because these plants grew where the colonists walked. What kind of seeds do these plants have?

1. Big seeds
2. Light weight seeds
3. Seeds with fluffs
4. Sticky seeds

The end!