In a majority of aquatic plants, flowers
Remain submerged in water
Emerge above the level of water
Are pollinated by water
Are pollinated by insects or wind

Options

A. A & C
B. B & D
C. B & C
D. A & D

Answer

To solve the question regarding the characteristics of flowers in a majority of aquatic plants, let's analyze each option step by step:

1. **Option A: Remain submerged in water**
- Most aquatic plants do not keep their flowers submerged. Instead, they often have adaptations that allow their flowers to be above the water surface for effective pollination. Therefore, this option is incorrect.

2. **Option B: Emerge above the level of water**
- Many aquatic plants have flowers that float on the surface or emerge above the water level. This adaptation helps in pollination and reproduction. Thus, this option is correct.

3. **Option C: Are pollinated by water**
- While some aquatic plants can be pollinated by water, this is not the predominant method of pollination. Many aquatic plants rely on other methods for pollination, such as insects or wind. Therefore, this option is also incorrect.

4. **Option D: Are pollinated by insects or wind**
- This option is accurate as many aquatic plants are indeed pollinated by insects or through wind. This method is more common than water pollination for these plants. Thus, this option is correct.

Based on the analysis:
- The correct answers are **B (Emerge above the level of water)** and **D (Are pollinated by insects or wind)**.

### Final Answer:
The correct options are B and D.