153
Question
Polyp phase is absent in
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Solution
The correct option is B Aurelia
Polyp phase is absent in Aurelia. There are about 10,000 known species and these are divided into three Classes (Hydrozoa, Scyphozoa and Anthozoa) according to whether the polyp or medusa stage is dominant in their life cycle. Many of the animals in this phylum are polymorphic. Generally polyps bud off or are formed sexually from medusae. Most medusae are mobile and the polyps tend to be sessile. Aurelia belongs to Class Scyphozoa. This Class contains the larger jellyfishes, with some reaching two metres across the bell and with tentacles 30 metres long. They are mainly marine and free floating, though they can "swim" by pulsations of the bell. In this Class the polyp stage is either reduced or absent. There are around 215 species.
Polyp phase is absent in Aurelia. There are about 10,000 known species and these are divided into three Classes (Hydrozoa, Scyphozoa and Anthozoa) according to whether the polyp or medusa stage is dominant in their life cycle. Many of the animals in this phylum are polymorphic. Generally polyps bud off or are formed sexually from medusae. Most medusae are mobile and the polyps tend to be sessile.
Aurelia belongs to Class Scyphozoa. This Class contains the larger jellyfishes, with some reaching two metres across the bell and with tentacles 30 metres long. They are mainly marine and free floating, though they can "swim" by pulsations of the bell. In this Class the polyp stage is either reduced or absent. There are around 215 species.
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