In which of the following vertebrate group/groups,heart does not pump oxygenated blood to different parts of the body ?

Options

A. Pisces and amphibians
B. Amphibians and reptiles
C. Amphibians only
D. Pisces only

Explanation

To solve the question regarding which vertebrate group does not have a heart that pumps oxygenated blood to different parts of the body, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which vertebrate group does not pump oxygenated blood to the body. This implies we need to identify the groups that have a different circulatory system.

2. **Identify the Vertebrate Groups**: The options provided are:
- A) Pisces (fishes)
- B) Amphibians and Reptiles
- C) Amphibians only
- D) Pisces only

3. **Review Circulatory Systems**:
- **Pisces (Fishes)**: Fishes have a single circulatory system. In this system, deoxygenated blood returns to the heart, is pumped to the gills for oxygenation, and then the oxygenated blood is distributed to the body. However, the heart does not pump oxygenated blood directly to the body; it first goes to the gills.
- **Amphibians**: Amphibians have a double circulatory system. Their heart pumps oxygenated blood to the body and receives deoxygenated blood from the body.
- **Reptiles**: Most reptiles also have a double circulatory system, where the heart pumps oxygenated blood to the body.

4. **Analyze the Options**:
- **Option A (Pisces)**: Correct, as the heart does not pump oxygenated blood directly to the body.
- **Option B (Amphibians and Reptiles)**: Incorrect, as both groups pump oxygenated blood to the body.
- **Option C (Amphibians only)**: Incorrect, as amphibians do pump oxygenated blood.
- **Option D (Pisces only)**: Correct, as it specifies Pisces, which do not pump oxygenated blood to the body.

5. **Conclusion**: The correct answer is **Pisces only** (Option D), as they have a single circulatory system where the heart does not pump oxygenated blood to the body directly.