1. The male and female cockroach can be distinguished by their

2. Coral reef forming coelenterates belong to the class

3. The planula larva is found in the life history of

4. Polymorphic cnidarians are the members of the class

5. Hepatic portal system is present in all

6. The communication in bees by special body movements(dances) was discovered by

7. Pronounced cephalisation is a characteristic

8. Hydra prevents self fertilization by being

9. Hemoglobin is dissolved in plasma in

10. Which of the following structures is present in all the chordates

11. The mouthparts of housefly are of

12. Digestion in sponges is

13. A photosensitive part of insect ommatidium

14. Nematocysts are the organs of

15. Sea anemone