Question

3. Members of the phylum Mollusca exhibit a by modifications to the different environments they is of the phylum Mollusca exhibit a wide diversity of body plans, often facilitated ons to the different environments they live in. Name the four classes of describe a unique character trait that has evolved in each group (4 points) Class Name Unique Character Trait 4. One of the defining features of the Kingdom Animalia is that all animals exhibit movement at some point in their lives. Explain how both sedentary and sessile animals move at some point in their lives and give an example of a type of animal for each.

Answer 1

3.

i) Gastrpods- Have well developed muscular foot. Also known as stomach footed molluscs.

ii)Bivalves- They have two parts of their shell, which can open and close. They are bilaterally symmetrical.

iii) Cephalopoda- These are exclusively marine molluscs that have a prominent and large head, eyes and tentacles. foot has been modified into a set of arms or tentacles. Members of this class can change color.

iv) Aplacophora- Without plates. Do not have shells but have small calcareous spicules embedded in their mantle.

4. Sessile and sedentary animals can move through water current (if aquatic) just like sponges and through wind current (If terrestrial).