Phytochrome in plants is sensitive to

Options

A. Gree light
B. Blue light
C. Red light
D. Red and far - red light

Answer

### Step-by-Step Solution

1. **Understanding Phytochrome**: Phytochromes are photoreceptors in plants that play a crucial role in detecting light. They help plants sense the direction and quality of light, which is essential for their growth and development.

2. **Identifying Light Sensitivity**: Phytochromes are sensitive to specific wavelengths of light. The question asks which type of light they are sensitive to among the options provided: green light, blue light, red light, or red far-red light.

3. **Analyzing Light Spectrum**: Sunlight consists of a visible spectrum that includes various colors. Among these, red light and far-red light are particularly important for phytochrome sensitivity.

4. **Conclusion**: Based on the understanding that phytochromes are specifically sensitive to red and far-red light, we can conclude that the correct answer to the question is that phytochrome in plants is sensitive to red and far-red light.

### Final Answer
Phytochrome in plants is sensitive to red and far-red light.

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