Question:
Which of the following statements is are correct regarding cnidarians?
A. Polypoid forms produce medusa asexually
B. Medusoid forms produce polypoid forms sexually
C. Metagenesis is the occurrence of different types of zooids
D. Polypoid forms produce medusa sexually
Which of the following statements is are correct regarding cnidarians?
A. Polypoid forms produce medusa asexually
B. Medusoid forms produce polypoid forms sexually
C. Metagenesis is the occurrence of different types of zooids
D. Polypoid forms produce medusa sexually
A. Polypoid forms produce medusa asexually
B. Medusoid forms produce polypoid forms sexually
C. Metagenesis is the occurrence of different types of zooids
D. Polypoid forms produce medusa sexually
Show Hint
Cnidarians show metagenesis: polyp (asexual) + medusa (sexual) phases alternate in life cycle.
Updated On: Jun 19, 2026
- A and B are correct but C and D are wrong
- A, B and C are correct but D is wrong
- A and B are wrong but C and D are correct
- A, B, C are wrong but D is correct
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understand cnidarian life cycle.
Cnidarians (e.g., Obelia, Aurelia) show alternation of generations involving polyp and medusa stages. This is known as metagenesis.
Step 2: Evaluate statement A.
Polyp stage reproduces asexually (budding) to produce medusae in many cnidarians. Hence, statement A is correct.
Step 3: Evaluate statement B.
Medusa produces gametes sexually. Fertilization leads to a larval stage (planula), which develops into polyp. Thus, medusoid forms are associated with sexual reproduction leading to polyp formation. Hence B is considered correct in this context.
Step 4: Evaluate statement C.
Metagenesis is not merely occurrence of different zooids; it is alternation between polyp and medusa forms. Hence C is incorrect.
Step 5: Evaluate statement D.
Polyp produces medusa asexually, not sexually. Hence D is incorrect.
Step 6: Final conclusion.
Statements A and B are correct, while C and D are incorrect.
Cnidarians (e.g., Obelia, Aurelia) show alternation of generations involving polyp and medusa stages. This is known as metagenesis.
Step 2: Evaluate statement A.
Polyp stage reproduces asexually (budding) to produce medusae in many cnidarians. Hence, statement A is correct.
Step 3: Evaluate statement B.
Medusa produces gametes sexually. Fertilization leads to a larval stage (planula), which develops into polyp. Thus, medusoid forms are associated with sexual reproduction leading to polyp formation. Hence B is considered correct in this context.
Step 4: Evaluate statement C.
Metagenesis is not merely occurrence of different zooids; it is alternation between polyp and medusa forms. Hence C is incorrect.
Step 5: Evaluate statement D.
Polyp produces medusa asexually, not sexually. Hence D is incorrect.
Step 6: Final conclusion.
Statements A and B are correct, while C and D are incorrect.
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