Question

What would be the results) if sea squirt's pharyngeal gill slits were experimentally blocked? 

1) The animal would not be able to reproduce sexually. 

2) The adult animal would have trouble moving around. 

3) The individual cells would leave this colonial organism to live on their own. 

4) The adult would have trouble feeding and doing pas exchange. 

5) The animal's nervous system would stop functioning. 

Question 2 

Which of the following is true of echinoderms? 

1) they have an exoskeleton similar to an insect's 

2) they have parapodia similar to polychaete worms and velvet worms 

3) they have an endoskeleton just inside their skin 

4) they have larvae that are radially symmetric and do not undergo metamorphosis 

Answer 1

1) 4

In Sea squirt water is propelled through the animal by phryngeal cillia. Food and oxygen is taken from the water current as water passes through gill slits in phrynx. Debris from dead plants and animals constitutes an important part of the diet in deeper water.

2) 3 They have bony endoskeleton just inside skin. They also have calcerous endoskeleton. Their larva show bilateral symmetry.