3.6 echinoderms &3.7

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Slide 1: Slide
BiologieMiddelbare schoolvwoLeerjaar 1

This lesson contains 32 slides, with interactive quizzes, text slides and 6 videos.

time-iconLesson duration is: 45 min

Items in this lesson

Slide 1 - Slide

Echinoderms 

  • have spiky skin 
  • although they do have stiff plates under their skin for support. 
  • are aquatic
  • have radial symmetry
  • have tube feet to move with


Slide 2 - Slide

Slide 3 - Video

VERTEBRATES / INVERTEBRATES

Ask yourself:
 ''Does it have a backbone?
YES
NO
VERTEBRATE
INVERTEBRATE
I-Book pg. 10-13

Slide 4 - Slide

sea stars
  • with a mouth located in the center of the body.
  • ‘spiny skinned’
  • aquatic
  • radial symmetry (5 equal parts)
  • endoskeleton

=> sea star

Slide 5 - Slide

What type of skeleton do molluscs have?
A
a kind of a shell
B
Endoskeleton
C
Hydroskeleton
D
Exoskeleton

Slide 6 - Quiz

What type of skeleton do Cnidarians have?

Slide 7 - Open question

Slide 8 - Video

What do sponges do to catch food?
A
They swim after it
B
They filter water
C
They wait for it to swim by and grab it
D
They have specialized cells with electric pulses

Slide 9 - Quiz

Which of the following animals is NOT a mollusc?
A
Octopus
B
Snail
C
Starfish
D
Mussel

Slide 10 - Quiz

How do Echinoderms move around?

Slide 11 - Open question

This animal has a ...
A
Bilateral symmetry
B
Radial symmetry
C
No symmetry

Slide 12 - Quiz

What is the symmetry of a wasp?
A
Bilateral
B
Radial
C
No symmetry

Slide 13 - Quiz

What is the symmetry of a sea star?
A
Bilateral symmetry
B
No symmetry
C
Radial symmetry
D
A and C are both possible

Slide 14 - Quiz

Slide 15 - Slide

3.7 arthropods!
  • Myriapods, 
  • Crustaceans, 
  • Arachnids 
  • Insects

Slide 16 - Slide

Arthropods
  • Arthropods are invertebrates
  • They have an exoskeleton
  • They have segmented bodies and legs 
  • Some of them have antennae on their heads
  • Because of the exoskeleton, they cannot grow easily (since the exoskeleton does not grow)
  • For this reason, they have to get rid of the exoskeleton and then develop a new, bigger one. We call this moulting or shedding
Segmented: this means that their body is divided into different parts. Most often, you can very clearly see the different parts.

Slide 17 - Slide

Myriapods
  • 10 or more pairs of legs
  • Very segmented 
  • Centipede has 1 pair of legs per segment, carnivores
  • Millipede has 2 pairs of legs per segment, herbivores


Myria = many
Pods = legs
So, Myriapods means 'many-legged'
In Dutch, we call them 'veelpotigen'

Slide 18 - Slide

Slide 19 - Video

What is the difference between centi and millipedes?

Slide 20 - Mind map

Insects
  • 3 main body parts: head, thorax and abdomen
  • 3 pairs of legs + 1 or 2 pairs of wings attached to thorax
  • Can have antennae

Slide 21 - Slide

Insects
Insects perform metamorphosis, which means that they have 2 stages during life:
1. Larvae or nymphs
2 Adult stage

Slide 22 - Slide

Metamorphosis
A complete change of the body and way of life

Slide 23 - Slide

caterpillar starts making pupa
butterfly emerges out of pupa
inside the pupa the caterpillar changes

Slide 24 - Drag question

Arachnids
  • 2 main body parts
  • 4 pairs of legs attached to front part
  • Spiders, ticks, mites and scorpions
  • Can be venomous!

Slide 25 - Slide

Crustaceans
  • Between 4 and 20 pairs of legs
  • Live in water, but can come onto land (they have gills)
  • Often, their legs look very different from each other (front vs back legs)
In Dutch, we call them 'Kreeftachtigen'

Slide 26 - Slide

Insect
Myriapod
Arachnid
Crustacean

Slide 27 - Drag question

make the excersizes of 3.7

Slide 28 - Slide

Slide 29 - Video

Slide 30 - Video

Why do we need bees? (and other insects)
  • I can imagine why you would find insects annoying, creepy, or ugly
  • However, they do have a very important job
  • See the next video for that!

Slide 31 - Slide

Slide 32 - Video