1. Nematocysts are the specialized cells found in the members of the phylum
a) Cnidaria
b) Porifea
c) Annelida
d) Mollusca
2. Tentacles of Hydra help in
a) locomotion
b) food capturing
c) both a and b
Hydra
3. Hydra is put under the phylum cnidaria because it has
a) Cnidoblasts
b) tentacles
c) hypostome
d) interstitial cells
4. The poisonous fluid present in the nematocysts of Hydra is
a) toxin
b) Hypnotoxin
c) venom
d) Haematin
5. Nematocysts are the organs of
a) sensation
b) reproduction
c) Defence and offence
d) respiration
6. Hydra prevents self fertilization by being
a) Protogynous
b) hermaphrodite
c) protandrous
d) monoecious
7. The planula larva is found in the life history of
a) Hydrozoan
b) Anthozoan
c) Scyphozoan
d) All of the above
8. Polymorphic cnidarians are the members of the class
a) Hydrozoa
b) Scyphozoa
c) Actinozoa
d) None of these
Great Barrier Reef
9. Coral reef forming coelenterates belong to the class
a) Hydrozoa
b) Scyphozoa
c) Actinozoa
d) All of the above
10. Among coelenterates medusoid individuals are absent in members of the class
a) Anthozoa
b) Hydrozoa
c) Scyphozoa
d) None of these
11. Ephyra is the larval form of
a) Sea anemone
b) Aurellia
c) Obelia
d) Hydra
12. Six septa or six mesenteries are characteristic of
a) Aurelia
b) Hydra
c) Obelia
d) Sea anemone
Sea anemone
13. Sea anemone is
a) diploblastic, radially symmetrical animal
b) diploblastic, bilaterally symmetrical animal
c) triploblastic, radially symmetrical animal
d) triploblastic, bilaterally symmetrical animal
14. The most primitive invertebrate to possess musculo- epithelial cells and nerve cells is
a) Sycon
b) Spongilla
c) Fasciola
d) Hydra
15. The first invertebrates to develop a true nervous system are
a) flat worms
b) sponges
c) coelenterates
d) annelids
