In hyponasty, there id is increased growth on

Options

A. Shaded side
B. Illuminated side
C. Lower surface
D. Upper surface.

Answer

**Step-by-Step Solution:**

1. **Understanding Hyponasty**: Hyponasty is a type of plant movement characterized by the upward bending of leaves. This movement occurs in response to various stimuli, such as light or gravity.

2. **Growth Patterns in Hyponasty**: In hyponasty, the bending of leaves upwards is due to increased growth on one side of the leaf. Specifically, this growth occurs on the lower surface of the leaf.

3. **Comparing with Epinasty**: To clarify, it’s useful to compare hyponasty with epinasty. Epinasty is the downward bending of leaves resulting from greater growth on the upper side of the leaf. In contrast, hyponasty involves greater growth on the lower side, leading to upward bending.

4. **Evaluating the Options**: The question provides four options: shaded side, illuminated side, lower surface, and upper surface. Based on our understanding of hyponasty, we need to identify which option corresponds to the increased growth that causes the upward bending of leaves.

5. **Identifying the Correct Answer**: Since hyponasty involves increased growth on the lower surface of the leaf, the correct answer to the question is "lower surface."

6. **Conclusion**: Therefore, in hyponasty, there is increased growth on the lower surface of the leaves.

**Final Answer**: Lower surface

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