Question

Name: Bio II Lab - Invertebrates I Worksheet What are 4 characteristics that all organisms in the Kingdom Animalia have in common? What Phylum has no symmetry? What Phyla are radially symmetrical? What are the 3 layers of true tissue in animals called, and what does each eventually become? What is the term used for organisms that have 3 germ layers? What Phyla do not have 3 germ layers? In Porifera (sponges), what is another term for collar cells? In Porifera, what are 2 functions of collar cells? How do Porifera reproduce? What are spicules? What is their function? What are 3 types of spicules in Porifera? What is the path of water through a sponge?

Please be clear with answers. Thank you!

Answer 1

1. Basic characters of all animals of kingdom animal is

a. All are multicellular.

b. Cells lack Cellwall

c. all are Heterotrphic, (obtain energy from food)

d. All most all shows sexual reproduction

e. Almost all shows locomotion

2. Phylum Porifera.

3.radially symmetrical ; phylum Cnidaria, ctenophora and Echinodermata( only adults)

4.the three layers of tissues are

1. Endoderm from which the Digestive system , respiratory system and internal organs develop

2.Mesoderm from which Muscular system, Skeletal system, blood and reproductive organs development.

3. Ectoderm from which Integument ( skin) , nervous system devlops.

5.triploblastic

6.Porifera, Cnidaria and Ctenophora.

7. Choanocytes.

8. Water flow in canals and food collection and some times reproduction.

9.reproduction in porifera by

a) asexual methods like Budding, fraentation, and by formation of gemmules.

b) sexual methods ( these are hermaphodite and fertilization is cross and internal)

10. Spicules forms the internal skeleton, made of calcareous or silicious or spongin spicules, the main function is to support the body and some times defense.

11.Calcarious, Silicious and Spongin fibre spicules.

12. Water path in sponges, out side to Ostia to spongocoel to osculum to out side.

13.sessile means they attached to a substratum and filter feeders mean they get food from filtering water, that is through water canals.

14.Yes

15.Polyp and Medusa.

16. No some have only polyp ( hydra) or medusa ( Aurelia) and some shows both (obelia).

17.Can get food from any direction.

18.Polyp

19.it is nematocyst used for Anchorage and defense.

20.nematocyst contain stinging capsule used for defense.

21.through filter feeding from water, digestion is both intra and extra cellular.

22.both sexually and Asexually.

23.some are seesile like hydra and some are free swimming like Aurelia and physalia