2.8. Sowing seeds

LESSON 16
  • Quiz?
  • Repeat 2.6. + 2.7.
  • 2.8. Sowing the seeds
  • Do your homework
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Slide 1: Tekstslide
BiologieMiddelbare schoolvmbo t, mavo, havoLeerjaar 1

In deze les zitten 30 slides, met interactieve quizzen en tekstslides.

time-iconLesduur is: 45 min

Onderdelen in deze les

LESSON 16
  • Quiz?
  • Repeat 2.6. + 2.7.
  • 2.8. Sowing the seeds
  • Do your homework

Slide 1 - Tekstslide

What is pollination?
timer
1:30

Slide 2 - Open vraag

Slide 3 - Tekstslide

Represents situation 3 no pollination, self-pollination or cross-pollination?
A
no pollination
B
self-pollination
C
cross-pollination

Slide 4 - Quizvraag

What is fertilisation?
timer
1:30

Slide 5 - Open vraag

Slide 6 - Tekstslide

Slide 7 - Tekstslide

Which is part of a seed?
A
flower
B
embryo
C
pollen
D
fruit

Slide 8 - Quizvraag

Which is part of a fruit?
A
flower
B
seed
C
pollen
D
leaf

Slide 9 - Quizvraag

Label part 9

Slide 10 - Open vraag

Label part 3

Slide 11 - Open vraag

Label part 7

Slide 12 - Open vraag

2.8. SOWING THE SEEDS
  • After a plant has been pollinated and then fertilised, it send its seeds into the world. 

Slide 13 - Tekstslide

2.8. SOWING THE SEEDS
  • After a plant has been pollinated and then fertilised, it send its seeds into the world. 
  • Plants have developed ways to make sure that their seeds are transported a good distance away from them. 

Slide 14 - Tekstslide

2.8. SOWING THE SEEDS
  • After a plant has been pollinated and then fertilised, it send its seeds into the world. 
  • Plants have developed ways to make sure that their seeds are transported a good distance away from them. 
  • This is called seed dispersal (zaadverspreiding)

Slide 15 - Tekstslide

Seeds can be dispersed in different ways. Can you think of a way?

Slide 16 - Open vraag

2.8. SOWING THE SEEDS
There are 4 different ways:
  1. Dispersal by animals
  2. Dispersal by wind
  3. Dispersal by water
  4. Dispersal by explosion 

Slide 17 - Tekstslide

1. Dispersal by animals
  • Birds and other animals eat the fruits of a plant, the seeds are not digested but excreted in their droppings elsewhere. 

Slide 18 - Tekstslide

1. Dispersal by animals
  • Birds and other animals eat the fruits of a plant, the seeds are not digested but excreted in their droppings elsewhere. 
  • Edible seeds without fleshy fruit (acorns/hazulnuts) are collected by animals and buried in the soil. 

Slide 19 - Tekstslide

1. Dispersal by animals
  • Birds and other animals eat the fruits of a plant, the seeds are not digested but excreted in their droppings elsewhere. 
  • Edible seeds without fleshy fruit (acorns/hazulnuts) are collected by animals and buried in the soil. 
  • There are also seeds which act like hitchhikers. These seeds have hooks on them and cling to the fur of animals that brush against them. 

Slide 20 - Tekstslide

Slide 21 - Tekstslide

2. Dispersal by wind
Pepper-pot type
The ovaries grow into hollow containers with one or more openings. The containers are shaken by the wind, scattering the seeds through the openings, dispersing them all aournd the immediate area. 

Slide 22 - Tekstslide

2. Dispersal by wind
Parachute type
The seeds have feathery hairs that look work like parachutes. This helps the seeds catch the wind and float away. 

Slide 23 - Tekstslide

2. Dispersal by wind
Winged type
Wing-like outgrowths on the fruit make it spin as it falls away from the parent plant. This spinning slows its fall so that the wind can carry it some distance away. 

Slide 24 - Tekstslide

3. Dispersal by water
  • Some seeds fall into water and get dispersed a second time.

Slide 25 - Tekstslide

3. Dispersal by water
  • Some seeds fall into water and get dispersed a second time.
  • Some plants grow near or in water and let their seeds fall into the water.  

Slide 26 - Tekstslide

4. Explosive dispersal
  • Some plants disperse their seeds by ejecting them with great force. 

Slide 27 - Tekstslide

4. Explosive dispersal
  • Some plants disperse their seeds by ejecting them with great force. 
  • As a pod dries, tensions grow in its walls. As the two halves of the pod suddenly split open, they throw the seeds out in an explosive manner. 

Slide 28 - Tekstslide

Slide 29 - Tekstslide

HOMEWORK
Friday 4 February
Complete the Google Form '2.8. Sowing the seeds' on Google Classroom

Slide 30 - Tekstslide