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Question
Which of the following animals is without sexual medusae?
Which of the following animals is without sexual medusae?
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Solution
The correct option is B Hydra
- Cnidaria exhibits two basic body forms polyp and medusa. In organisms, such as members of the genus Obelia, the polyp is the asexual stage, and the medusa the sexual stage.
- In such organisms, the polyp, by budding, gives rise to medusae, which detaches themselves and survive as an individual or remain permanently attached to the polyp.
- The medusae then produce new polyps by sexual reproduction. A medusa produces eggs or sperm, which are usually shed into the water; when an egg is fertilized, it develops into a swimming larva, which eventually settles and grows into a polyp.
- However, some Cnidarians, like Hydra, do not have a medusa stage. Hence, Option B is correct.
- Cnidaria exhibits two basic body forms polyp and medusa. In organisms, such as members of the genus Obelia, the polyp is the asexual stage, and the medusa the sexual stage.
- In such organisms, the polyp, by budding, gives rise to medusae, which detaches themselves and survive as an individual or remain permanently attached to the polyp.
- The medusae then produce new polyps by sexual reproduction. A medusa produces eggs or sperm, which are usually shed into the water; when an egg is fertilized, it develops into a swimming larva, which eventually settles and grows into a polyp.
- However, some Cnidarians, like Hydra, do not have a medusa stage. Hence, Option B is correct.
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