Alternation of Generations in Cnidarians

Q. Medusa of Coelenterata is

1. sexually reproducing
2. free swimming
3. umbrella shaped
4. all of these

Q. Alternation of generations is seen in

1. Adamsia
2. Aurelia
3. Hydra
4. Obelia

Q. Consider the following statements during the alternation of generation or metagenesis in dimorphic cnidarians, the polyps are:
(1) Sedentary
(2) Free living
(3) Polyp forms the medusa sexually
(4) Polyp forms the medusa asexually
Which of the following given statements are correct?

1. 1, 3 and 4 are correct
2. 1 and 4 are correct
3. 2, 3 and 4 are correct
4. 1, 2 and 3 are correct

Q. Identify incorrect statements with regard to coelenterata.

1. Gorgonia exhibits two basic forms called polyp and medusa
2. Aurelia contains medusa stage
3. Animals contain gastrovascular cavity
4. Hydra is fresh water polyp