Closure of lamina in Venus Fly Trap (Dionaea muscipula) after an insect happens to alight over it is
(A) Thigmotropism
(B) Haptonasty
(C) Chemotropism
(D) Chemonasty

Options

A. Thigmotropism
B. Haptonasty
C. Chemotropism
D. Chemonasty.

Answer

To solve the question regarding the closure of the lamina in the Venus Fly Trap (Dionaea muscipula) after an insect lands on it, we need to analyze the options provided and understand the underlying concepts.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the type of movement that occurs when the lamina of the Venus Fly Trap closes after an insect lands on it.

2. **Analyzing the Options**:
- **(A) Thigmotropism**: This refers to directional growth in response to touch. For example, climbing plants exhibit this type of movement. However, this is not the correct answer because the closure of the lamina is not a growth response but rather a rapid movement.

- **(B) Haptonasty**: This is a non-directional movement in response to touch. The closure of the lamina in the Venus Fly Trap occurs when sensory hairs are triggered by the presence of an insect, indicating that this is indeed a non-directional response to touch. Therefore, this option seems promising.

- **(C) Chemotropism**: This refers to movement in response to a chemical stimulus. Since the closure of the lamina does not involve a chemical stimulus, this option is incorrect.

- **(D) Chemonasty**: Similar to chemotropism, this is a non-directional movement but in response to a chemical stimulus. Since the closure of the lamina is not due to a chemical stimulus, this option is also incorrect.

3. **Conclusion**: After analyzing all the options, we find that the correct answer is (B) Haptonasty, as the closure of the lamina is a non-directional response to the touch of an insect.

### Final Answer:
**(B) Haptonasty**