In a flowering plant the substance that is not transported is

Options

A. water and mineral nutrients
B. organic nutrients
C. plant growth regulators
D. oxygen In a flowering plant

Answer

To determine which substance is not transported in a flowering plant, we can analyze the various substances typically involved in plant transport:

1. **Water and Mineral Nutrients**:
- Water is absorbed by the roots and transported through the xylem in a unidirectional manner (from roots to stems and leaves).
- Mineral nutrients are also transported, but they can move in a multidirectional manner, especially when parts of the plant are senescing (dying) and need to transfer nutrients to growing parts.

2. **Organic Nutrients**:
- Organic nutrients (like sugars) are transported throughout the plant in a multidirectional manner. They move from sources (where they are produced) to sinks (where they are used or stored), especially during growth or senescence.

3. **Plant Growth Regulators (Hormones)**:
- These are also transported in small amounts, typically in a unidirectional manner, influencing growth and development.

4. **Oxygen**:
- Unlike the other substances mentioned, oxygen is not transported within the plant in the same way. While plants do take in oxygen for respiration, it is not transported through the vascular system like water, minerals, or nutrients.

Based on this analysis, the substance that is not transported in a flowering plant is **Oxygen**.

**Final Answer**: Oxygen is the substance that is not transported in a flowering plant.