A jawless fish, which lays eggs in freshwater and whose ammocoetes larvae after metamorphosis return to the ocean is
1. Eptratretus
2. Myxine
3. Neomyxine
4. Petromyzon

Metagenesis refers to

1. The presence of different morphic  forms

2. Alternation of generation between asexual and sexual phrases of an organism

3. Occurrence of a drastic change in the form during post-embryonic development

4. Presence of segmented body and parthenogenic mode of reproduction

Body having meshwork of cells, internal cavities lined with food filtering flagellated Cells and indirect development is the characteristics of phylum

1. Coelenterata

2. Porifera

3. Mollusca

4. Protozoa

Which of the following represents the correct combination without any exception? 

1. a
2. b
3. c
4. d

Select the Taxon mentioned that represents both marine and fresh water species :

1. Echionoderms

2. Ctenophroa

3. Cephalocarodata

4. Cnidaria

Which one of the following living organisms completely lacks a cell wall?

1. Cyanobacteria

2. Sea- fan (Gorgonia)

3. Saccharomyces

4. Coelenterata algae

Planaria possess high capacity of 

1. metamorphosis

2. regeneration

3. alternation of generation

4. bioluminescene

A marine cartilaginous fish that can produce electric current is:

1. Pristis

2. Torpedo

3. Trygon

4. Scoliodon