The bladder helps in floating and trapping insects is found :

Options

A. Zizyphus
B. Utricularia
C. Nepenthes
D. Acacia

Answer

### Step-by-Step Solution:

1. **Identify the Function of the Bladder**: The question states that the bladder helps in floating and trapping insects. This indicates that we are looking for a plant that has specialized structures (bladders) for these functions.

2. **Understand the Types of Plants**: The plants that have bladders for trapping insects are typically categorized as aquatic carnivorous plants. These plants not only float but also capture and digest insects for nutrients.

3. **Identify the Relevant Plant**: The transcript mentions Utricularia, which is known as a rootless aquatic plant. Utricularia has bladders that provide buoyancy and help in trapping insects.

4. **Differentiate from Other Plants**: The transcript also mentions other plants like Zizipus, Nepenthes, and Acacia. However, Zizipus is a shrub, Nepenthes is a terrestrial carnivorous plant (known as pitcher plants), and Acacia is a tall tree. None of these have bladders that serve the specific function of floating and trapping insects like Utricularia does.

5. **Conclusion**: Based on the information provided, the bladder that helps in floating and trapping insects is specifically found in the plant Utricularia.

### Final Answer:
The bladder that helps in floating and trapping insects is found in **Utricularia**.

---