In which of the following plants do you expect transpiration to occur only from the upper surface of the leaf?

Options

A. Land plants
B. Xerophytic plants
C. Aquatic plants with floating leaves
D. Aquatic submerged plants

Answer

To determine in which type of plant transpiration occurs only from the upper surface of the leaf, we need to analyze the options given:

1. **Land Plant**: These plants typically have stomata on both the upper and lower surfaces of their leaves to facilitate gas exchange and transpiration. Therefore, transpiration does not occur only from the upper surface.

2. **Zero Fatigue Plant**: This term is not commonly used in plant biology. However, if we assume it refers to a specific type of plant, we would need more context to determine its transpiration characteristics. Generally, most plants do not transpire only from one surface.

3. **Aquatic Plant with Floating Leaves**: These plants usually have their stomata located on the upper surface of the leaves that are above the water. This adaptation allows them to transpire effectively while minimizing water loss since the lower surface is submerged in water.

4. **Aquatic Summer Plant**: Similar to the aquatic plants with floating leaves, these plants may also have adaptations that allow for transpiration primarily from the upper surface, especially if they are adapted to floating or partially submerged conditions.

Based on this analysis, the most likely candidate for transpiration occurring only from the upper surface of the leaf is the **Aquatic Plant with Floating Leaves**.

### Step-by-Step Solution:
1. **Identify the types of plants listed**: Land Plant, Zero Fatigue Plant, Aquatic Plant with Floating Leaves, Aquatic Summer Plant.
2. **Analyze each plant type for stomata distribution**:
- Land Plant: Stomata on both surfaces.
- Zero Fatigue Plant: Unknown, but likely not limited to one surface.
- Aquatic Plant with Floating Leaves: Stomata primarily on the upper surface.
- Aquatic Summer Plant: Likely similar to the floating leaves.
3. **Determine which plant type has transpiration occurring only from the upper surface**: The Aquatic Plant with Floating Leaves is the best choice.
4. **Conclude the answer**: Transpiration occurs only from the upper surface in the Aquatic Plant with Floating Leaves.