Lianas are
(a) Weak stemmed trailers
(b) Weak stemmed climbers and twiners
(c) Tress with twisted stems
(d) Plants with woody stems and medium height.

Options

A. Weak stemmed trailers
B. Weak stemmed climbers and twiners
C. Tress with twisted stems
D. Plants with woody stems and medium height.

Answer

To determine the correct answer to the question about lianas, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Definition of Lianas**:
- Lianas are typically defined as woody plants that climb or twine around other structures, such as trees, to reach sunlight.

2. **Analyzing the Options**:
- **Option (a)**: Weak stemmed trailers.
- This is incorrect because lianas are not just trailers; they are climbers.
- **Option (b)**: Weak stemmed climbers and twinners.
- This is correct because lianas have weak stems that allow them to climb and twine around other plants.
- **Option (c)**: Trees with twisted stems.
- This is incorrect because lianas are not trees; they are climbing plants.
- **Option (d)**: Plants with woody stems and medium height.
- This is also incorrect because lianas can grow very tall as they climb up other structures.

3. **Conclusion**:
- Based on the analysis, the correct answer is **(b) Weak stemmed climbers and twinners**.

### Final Answer:
**(b) Weak stemmed climbers and twinners.**

---