✓✗In which phylum, nerve cells are found but nerves are absent?

✓✗Match List I with List II.

List I	List II
A. Chondrichthyes	I. Clarias
B. Cyclostomata	II. Carcharodon
C. Osteichthyes	III. Myxine
D. Amphibia	IV. Ichthyophis

Choose the correct answer from the options given below.

✓✗Which one of the following fishes does not belong to class osteichthyes?

✓✗Wax glands of the honey bee are present in the

✓✗Which one of the following is a tailless primate?

✓✗Which of the following groups of characters is present in all chordates in some or other stage in their life?

✓✗In Hydra, the waste material of food digestion and the nitrogenous waste material are removed, respectively, through the

✓✗Organ Pipe Coral is

✓✗Sponges show which level of organisation?

✓✗All chordates at one or the other stage have

✓✗The lac insect is

✓✗Select the correct statements.
A. Platyhelminthes are triploblastic, pseudocoelomate and bilaterally symmetrical organisms.
B. Ctenophores reproduce only sexually and fertilisation is external.
C. In tapeworm, fertilisation is internal but sexes are not separate.
D. Ctenophores are exclusively marine, diploblastic and bioluminescent organisms.
E. In sponges, fertilisation is external and development direct.
Choose the correct answer from the options given below.

✓✗True coelom appeared first in the course of evolution in

✓✗Which of the following statements about Chondrichthyes are correct?
A. The notochord persists throughout life.
B. Gill slits are covered by an operculum.
C. The mouth is ventral.
D. Many are viviparous with internal fertilisation.
E. An air bladder is present.
Choose the correct answer from the options given below.

✓✗The feather-like gills of molluscs, present in the mantle cavity, have