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

Options

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

Answer

To solve 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 Carotenoids**:
- Carotenoids are organic pigments found in plants, algae, and some photosynthetic bacteria. They are responsible for the bright yellow, orange, and red colors in various fruits and vegetables.

2. **Function of Carotenoids**:
- These pigments play a crucial role in photosynthesis by absorbing light energy, which is then used for the synthesis of food. They also act as antioxidants.

3. **Location of Carotenoids**:
- Carotenoids are primarily located in the chloroplasts and chromoplasts of plant cells.

4. **Absorption Spectrum**:
- Carotenoids absorb light primarily in the blue and green regions of the visible spectrum. They do not absorb light effectively in the red region, which is why they appear yellow, orange, or red as they reflect these longer wavelengths.

5. **Conclusion**:
- Based on the absorption characteristics of carotenoids, the correct answer to the question is that they primarily absorb the blue and green fractions of the visible spectrum.

### Final Answer:
The fractions of the visible spectrum of solar radiations that are primarily absorbed by carotenoids of higher plants are **blue and green**.