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(B) The epidermis of $Hydra$ contains several specialized cell types.$1$. Interstitial cells: These are totipotent cells found in both the epidermis a

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$B$ only

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(B) The epidermis of $Hydra$ contains several specialized cell types.$1$. Interstitial cells: These are totipotent cells found in both the epidermis and gastrodermis,capable of differentiating into various cell types.$2$. Cnidoblasts (or Cnidocytes): These are specialized stinging cells that contain nematocysts. They are exclusively found in the epidermis of cnidarians and are a characteristic feature of the phylum $Cnidaria$.$3$. Sensory cells: These are found in the epidermis,but similar sensory structures are also present in other animal phyla.$4$. Germ cells: These are derived from interstitial cells and are found in the epidermis during the reproductive phase,but they are not restricted to the epidermis in all contexts.Since $Cnidoblasts$ are the unique and characteristic cells found only in the epidermis of cnidarians,the correct answer is $B$ only.

Which of the following cells are present only in the epidermis of Hydra?
$(A)$ Interstitial cells
$(B)$ Cnidoblasts
$(C)$ Sensory cells
$(D)$ Germ cells

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Which of the following cells are present only in the epidermis of Hydra?$(A)$ Interstitial cells$(B)$ Cnidoblasts$(C)$ Sensory cells$(D)$ Germ cells