Erythrocytes of Frog are

Options

A. Biconcave
B. Biconvex
C. Nucleated
D. Both B and C

Answer

To answer the question "Erythrocytes of Frog are?", we will analyze the characteristics of erythrocytes (red blood cells) in frogs and compare them with those in humans.

### Step-by-Step Solution:

1. **Understanding Erythrocytes**: Erythrocytes, commonly known as red blood cells (RBCs), are crucial components of blood responsible for the transport of oxygen and carbon dioxide.

2. **Shape of Erythrocytes in Frogs**: In frogs, erythrocytes are described as oval or elliptical in shape. This is different from the shape of human erythrocytes, which are circular.

3. **Convexity of Erythrocytes**: The erythrocytes of frogs are biconvex in structure. This means they have a disc-like shape that is curved outward on both sides. In contrast, human erythrocytes are biconcave, meaning they are indented on both sides.

4. **Presence of Nucleus**: A significant difference between frog and human erythrocytes is that frog erythrocytes are nucleated, meaning they contain a nucleus. On the other hand, human erythrocytes are enucleated, lacking a nucleus.

5. **Analyzing the Options**:
- Option A: Biconcave - Incorrect (this applies to humans).
- Option B: Biconvex - Correct (this applies to frogs).
- Option C: Nucleated - Correct (this applies to frogs).
- Option D: Both B and C - Correct (as both characteristics apply to frog erythrocytes).

6. **Final Answer**: Therefore, the correct answer is option D: Both B and C.