Cardinal temperature is related to

Options

A. minimum temperature
B. maximum temperature
C. minimum, maximum and optimum temperature
D. minimum and maximum temperature

Answer

### Step-by-Step Solution

1. **Understanding Cardinal Temperature**: Cardinal temperature refers to the range of temperatures that are critical for the growth and development of plants. It includes three specific points: minimum temperature, optimum temperature, and maximum temperature.

2. **Identifying the Three Cardinal Points**:
- **Minimum Temperature**: This is the lowest temperature at which a plant can grow. Below this temperature, growth is inhibited or completely halted.
- **Optimum Temperature**: This is the temperature range where the plant grows best. At this temperature, the rate of growth is maximized.
- **Maximum Temperature**: This is the highest temperature at which a plant can grow. Beyond this temperature, the plant may suffer from heat stress, leading to reduced growth or damage.

3. **Graphical Representation**: If you were to plot a graph with plant growth on the y-axis and temperature on the x-axis, you would see a curve that rises to a peak (optimum temperature) and then falls as temperatures exceed the maximum threshold.

4. **Application in Agriculture**: Understanding cardinal temperatures is crucial for agricultural practices. By knowing the optimal temperature ranges for specific crops, farmers can create suitable growing conditions, even in environments where natural temperatures may not be ideal.

5. **Conclusion**: The cardinal temperatures are essential for determining the growth conditions of plants. They include the minimum, optimum, and maximum temperatures that influence plant development.