Structure of Typical Molluscan Body

Q. Molluscs differ from annelids in

1. having a closed circulatory system
2. having direct development
3. having segmented body
4. having unsegmented body

Q. The unsegmented animals belong to the phyla

1. Annelida and Aschelminthes
2. Mollusca and Annelida
3. Aschelminthes and Mollusca
4. Arthropoda and Aschelminthes

Q. Feather like gills are present in the _______ of molluscs.

1. head
2. mantle cavity
3. visceral hump
4. foot

Q. Which among the following is incorrect with respect to molluscs?

1. All have a soft segmented body which is differentiated into head, foot and visceral mass
2. The visceral mass is covered by a mantle
3. Open type of blood vascular system is seen
4. Molluscs are coelomates

Q. Metameric segmentation is the characteristic of :

1. Plathylminthes and Arthropoda
2. Echinodermata and Annelida
3. Annelida and Arthropoda
4. Mollusca and Chordata

Q. is an organ present in the mouth of molluscs for rasping.

1. Mantle
2. Radula
3. Hump
4. Malpighian tubules

Q. Visceral mass occurs in Phylum

1. Arthropoda
2. Echinodermata
3. Mollusca
4. All the above