Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants

Options

A. Violet and blue
B. Blue and green
C. Green and red
D. Red and Violet

Answer

To answer the question regarding which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids in higher plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Visible Spectrum**:
- The visible spectrum of solar radiation ranges from approximately 400 nanometers (nm) to 700 nm. This spectrum includes various colors of light, which can be identified as violet, blue, green, yellow, orange, and red.

2. **Identifying Carotenoids**:
- Carotenoids are pigments found in higher plants that play a crucial role in photosynthesis. They are known for their ability to absorb light energy.

3. **Light Absorption by Carotenoids**:
- Carotenoids primarily absorb light in the violet and blue regions of the visible spectrum. This absorption is essential for the photosynthetic process, as it helps in capturing light energy.

4. **Choosing the Correct Option**:
- Given the options provided (violet and blue, blue and green, green and red, red and violet), the correct answer is the option that includes the violet and blue light absorption.

5. **Final Answer**:
- The fractions of the visible spectrum of solar radiations that are primarily absorbed by carotenoids in higher plants are **violet and blue** light.