Solarisation is

Options

A. formation of chlorophyll
B. effect of excess solar radiation
C. Destruction of chlorophyll by poisons
D. utilisation of sunlight

Answer

### Step-by-Step Solution:

1. **Definition of Solarization**: Solarization refers to the destruction of chlorophyll in plants. This process can occur due to various factors, including the presence of poisons or excessive solar radiation.

2. **Role of Chlorophyll**: Chlorophyll is the primary pigment in plants responsible for photosynthesis, giving them their green color. It is crucial for the absorption of light energy.

3. **Factors Leading to Solarization**: The destruction of chlorophyll can be caused by:
- Poisons that affect the chlorophyll molecules.
- Excess solar radiation that can lead to the formation of high-energy radicals, which can damage chlorophyll.

4. **Role of Carotenoids**: Carotenoids are pigments present in plants that help in preventing solarization. They come in colors like red, orange, and yellow and play a protective role against the destruction of chlorophyll.

5. **C3 Plants and Solarization**: C3 plants are particularly susceptible to solarization because they generally have lower amounts of carotenoids. This makes them more prone to chlorophyll destruction when exposed to excessive sunlight or other damaging factors.

6. **Conclusion**: Therefore, solarization is specifically defined as the destruction of chlorophyll due to various factors, primarily poisons and excess energy, rather than the formation of chlorophyll or the utilization of sunlight.