At which temperature, germination of seed can not possible in most of the plants :-

Options

A. `10^@-15^@ C`
B. `5^@- 10 ^@`
C. `0^@- 5^@C`
D. `20^@- 25^@ C`

Answer

To determine the temperature at which seed germination is not possible in most plants, we can follow these steps:

### Step 1: Understand Seed Germination
Seed germination is the process by which a seed develops into a new plant. This process is influenced by various environmental factors, including temperature.

### Step 2: Identify Optimum Temperature Range
Research indicates that the optimum temperature range for seed germination in most plants is typically between 25°C to 35°C. This means that seeds germinate best within this temperature range.

### Step 3: Analyze the Given Temperature Options
The question provides four temperature options:
1. 10 to 15°C
2. 5 to 10°C
3. 0 to 5°C
4. 20 to 25°C

### Step 4: Evaluate the Lower Temperature Limits
As the temperature drops, the metabolic processes in seeds slow down. At temperatures around 0 to 5°C, most seeds will not germinate because the conditions are too cold for the necessary biochemical processes to occur.

### Step 5: Conclusion
Based on the analysis, the temperature at which germination of seeds is not possible in most plants is **0 to 5°C**.

### Final Answer
The correct answer is **option 3: 0 to 5°C**.

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