A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is

1. Eptatretus

2. Exocoetus

3. Neomyxine

4. Petromyzon

Metagenesis refers to

1. the presence of different morphic forms

2. alternation of generation between asexual and sexual phases of an organism

3. occurance of a drastic change in form during post embryonic development

4. the presence of a segmented body and parthenogenetic mode of reproduction

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

Which of the following animals is not viviparous?

1. Flying fox (bat)               

2. Elephant

3. Platypus

4. Whale

Chitin is a polysaccharide found in the exoskeleton of

1. prawn

2. insects

3. crabs

4. all of these

Which of these is not a coelenterate?

1. Sea pen

2. Sea fur

3. Sea anemone

4. Sea lily

Which of the following is a fish?

1. Flying fish

2. Jelly fish

3. Devil fish

4. Star fish

Which of the following is not an annelid?

1. Leech

2. Earhtworm

3. Sea mouse

4. Sea cucumber

Buoyancy in a bony fish is maintained with the help of

1. streamlined body

2. paired fins

3. swim bladder

4. all the above

In which of the following animals the adults have pentamerous radial symmetry while their larvae are bilaterally symmetrical?

1. Arthropods

2. Molluscs

3. Echinoderms

4. Annelids