Grade 8- porifera-annelida

1. OBJECTIVES:
1. explain the concept of animal kingdom invertebrates;
2. discuss the general characteristics of invertebrates;
3. name the different Phyla of Invertebrates;
4. describe the distinguish characteristics of each phyla;
5. classify and evaluate common invertebrates.

2. THE MAIN CHARACTERISTICS OF
ANIMALS
 Animals are the most complex living things.
 They usually have organs and systems.
 They can perform the three vital functions. (Nutrition, interaction
and reproduction)
 They can move and interact with other living things.
 Animal reproduction can be:
 Asexual:
 Sexual :
 They can be:
 Viviparous animals -
 Oviparous animals -
 Ovoviviparous animals -

3. Are they viviparous, oviparous or
ovoviparous?

4. Animals have body plans.
a.Asymmetrical
a.Bilateral symmetry
b. Radial symmetry

5. CLASSIFICATION OF ANIMALS
Two groups:
 Invertebrates: which don’t have an internal
skeleton without backbone.
 Vertebrates: which have an internal skeleton
with a backbone.

6. INVERTEBRATES

7. 1. PORIFERA

8. Sponges are aquatic animals. Most of them are
marine.
They live attached to sand or rocks.
The body is perforated by pores and supported by
small needles called spicules.
They have an internal cavity with an upper hole
called osculum.
They are filtering animals. They feed filtering water
and retaining food particles.
They can reproduce sexually or asexually
(fragmentation o budding).

9. WATER CIRCULATION IN A
SPONGE.

10. 2. CNIDARIA

11. Cnidaria are aquatic animals. Most of them are
marine.
Examples: Corals, jellyfish, sea anemones, hydra.
Cnidaria have two body forms:
Swimming medusae: An umbrella shape floating
freely.
Sessile polyps: a bag shape fixed to the ground.
They have a mouth with tentacles with stinging cells
called cnidocytes and a gastrovascular cavity.
They can reproduce sexually or asexually (budding)
Cnidaria are carnivores and catch their prey

12. a. Hydrozoa
b. Scyphozoa
c. Anthozoa
CLASSES OF CNIDARIANS

13.  animals with a soft, elongated body.
 they can grow back parts if they lose parts
Three types:
Phylum Platyhelminthes
Phylum Nematodes
Phylum Annelids
3. WORMS

14. are flat worms, they live in wet environments or can be parasites.
Ex: Planaria and Taenia.

PLATYHELMINTHES

15.  .
 NEMATODES: are cylindrical worms. They live in water,
wet soil or parasites. Ex: Hookworms.
NEMATHELMINTHES

16.  ANNELIDS: are worms with segments.
The body is long and divided in rings. They live in wet soil or
water.
They have specialised systems.
ANNELIDA

17. OBJECTIVES:
1. explain the concept of animal kingdom invertebrates;
2. discuss the general characteristics of invertebrates;
3. name the different Phyla of Invertebrates;
4. describe the distinguish characteristics of each phyla;
5. classify and evaluate common invertebrates.

18. SYNTHESIS
Group Presentations…

19. VALUES INTEGRATION
Some invertebrates such as
worms and insects are causing
diseases. Suggest ways on how
people can avoid diseases.

20. ASSIGNMENT
1. What are the other phyla of
invertebrates?
2. List down the general
characteristics of the vertebrates.
3. Enumerate the 7 classes of
chordates and give the
characteristics of each class.

21. CHECK UP!
1. What is the main characteristic of nematodes?
2. Copy and complete this sentence in your notebook.
Annelids’ bodies are…………. and divided into
………. or ……….. They live in ………
3. What will happen if a earthworm lie in the sun?
4. What is the main characteristic of
platyhelminthes?

22. 5.True or false?
a)Asexual reproduction happens through internal
fecundation.
b) Budding is a kind of asexual reproduction.
c) In viviparous animals the embryo develops
inside the mother’s body.
d) In oviparous animals the egg develops inside
the mother’s body.

23. 6.Explain how porifera and cnidaria feed.
7.Copy and complete the following sentences in
your notebook.
a) Polyps have the shape of a …………
b)Medusae have the shape of an …………..
8. True or false?
a) Porifera live freely, floating on sea water.
b) Porifera can reproduce sexually or asexually.
c) Corals are porifera with the shape of a polyp.
d) Cnidaria can reproduce sexually from eggs.