Alternation of Generations in Cnidarians
Trending Questions
Q.
What is Amphiblastula larva?
Q.
Is hydra a polyp or medusa?
Q. Which of the following terms describe the life cycle of Obelia?
- Metamerism
- Metagenesis
- Regeneration
- None of these
Q. Assertion :All metatherians are placental animals. Reason: All placental mammals have menstrual cycle.
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
- Assertion is correct but Reason is incorrect.
- Both Assertion and Reason are incorrect.
Q. Statement (S): In many gastropods, the anus and mantle cavity are placed anteriorly above the head.
Reason (R): During embryonic development, in many gastropods, one side of the visceral mass grows faster than the other side. The uneven growth rotates the visceral organs upto 1800 in many gastropods.
- Both S and R are true and R explains S
- Both S and R are wrong
- Both S and R are true but R cannot explain S
- Only S is correct R is wrong
Q.
Metagenesis refers to
Metamorphosis
Alternation of generations
Metamerism
None of these
Q. Polyp phase is absent in
- Hydra
- Physalia
- Aurelia
- Obelia
Q. Assertion [A]: Obelia exhibits metagenesis.
Reason [R]: Obelia exists in both polyp and medusa form.
Reason [R]: Obelia exists in both polyp and medusa form.
- Both [A] and [R] are true and [R] is the correct explanation of [A]
- Both [A] and [R] are true but [R] is not the correct explanation of [A]
- [A] is true but [R] is false
- Both [A] and [R] are false
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) 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, 3 and 4 are correct
- 1 and 4 are correct
- 2, 3 and 4 are correct
- 1, 2 and 3 are correct
Q. Rhagon type of larva is found in
- Spongilla
- Leucosolenia
- Sycon
- All of the above