If the seeding are grown in darkness

Options

A. They are of the same size as those grown in light
B. They are much healthier than those grown in light
C. they are similar to those grown in light
D. They are taller than those grown in light

Answer

To solve the question regarding the growth of seedlings in darkness, we will analyze the effects of light on plant growth, particularly focusing on the role of phytohormones like auxin.

### Step-by-Step Solution:

1. **Understanding Seedling Growth**: Seedlings require light for photosynthesis, which is essential for their growth and development. In the absence of light, seedlings undergo different physiological changes.

**Hint**: Consider the role of light in plant growth and the process of photosynthesis.

2. **Role of Auxin**: Auxin is a plant hormone that promotes cell elongation and is sensitive to light. When seedlings are exposed to light, auxin levels can be regulated, leading to normal growth patterns.

**Hint**: Think about how hormones influence plant growth and how their activity might change in different light conditions.

3. **Growth in Darkness**: When seedlings are grown in darkness, the auxin hormone is not broken down by light. This leads to an increased rate of cell elongation, causing the seedlings to grow taller in search of light.

**Hint**: Reflect on how the absence of light affects the stability and function of growth hormones in plants.

4. **Comparison with Seedlings Grown in Light**: Seedlings grown in light will have a more balanced growth due to the regulation of auxin. In contrast, seedlings grown in darkness will be taller but may not be as healthy or robust.

**Hint**: Compare the expected growth characteristics of seedlings in light versus those in darkness.

5. **Conclusion**: Based on the understanding that seedlings grown in darkness will utilize auxin more effectively to elongate, we conclude that seedlings grown in darkness will be taller than those grown in light.

**Final Answer**: The correct option is that seedlings grown in darkness are taller than those grown in light.