Which one of the following is present in the integument of frog but not in that of mammals ?

Options

A. Dermis
B. Mucous gland
C. Sweat glands
D. Stratum germinativum

Answer

**Step-by-Step Solution:**

1. **Understanding Integument**: The integument refers to the outer covering of an organism, which includes the skin and its associated structures. In frogs and mammals, the integument serves various functions, including protection, sensation, and respiration.

2. **Identifying Key Structures**: Both frogs and mammals have several common structures in their integument, such as dermis and epidermis. However, there are also unique features present in each group.

3. **Mucous Glands in Frogs**: Frogs possess mucous glands in their skin. These glands secrete mucus, which keeps the skin moist and allows for cutaneous respiration (breathing through the skin). This is particularly important for frogs as they often live in moist environments and rely on their skin for gas exchange.

4. **Absence of Mucous Glands in Mammals**: In contrast, mammals do not have mucous glands in their skin. Instead, they have sweat glands, which help in thermoregulation by cooling the body through the evaporation of sweat.

5. **Conclusion**: The key difference in the integument of frogs compared to mammals is the presence of mucous glands in frogs. Therefore, the correct answer to the question is that mucous glands are present in the integument of frogs but not in that of mammals.

**Final Answer**: Mucous glands are present in the integument of frogs but not in that of mammals.

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